The research, conducted by a team at the University of Parakou’s Laboratory of Ecology, Health and Animal Production, surveyed 236 people between July and November 2025 in the Borgou department, the heart of Benin’s nascent goat dairy industry. What sets the study apart is its three-way segmentation of respondents. Rather than lumping everyone into a single category of consumer or non-consumer, the researchers divided participants into three distinct groups: 81 people who knew and had consumed goat milk or its derived products, 77 who knew of the products but had never tried them, and 78 who had no prior knowledge of goat milk at all. This tripartite design allowed the team to test a crucial assumption, namely that the barriers to adoption are unlikely to be uniform across the full spectrum of potential consumers.

The statistical architecture of the study was correspondingly careful. Data were collected through structured face-to-face questionnaires containing 31 substantive items across four modules, pre-tested on 30 individuals before deployment. Because the three groups differed in how they were recruited, consumers and knowledgeable non-consumers were identified at production farms and sales points, while non-knowledgeable individuals were randomly selected in urban centers, the researchers used Chi-square tests to compare categorical variables and Welch’s one-way analysis of variance, robust to unequal variances, for age comparisons, followed by Games-Howell post-hoc tests. Levene’s test confirmed that variances were indeed unequal, justifying the choice of the Welch approach. A significance threshold of p less than 0.05 was applied throughout.

The sociodemographic results were revealing in their asymmetry. Consumers of goat milk products were significantly younger, averaging 30.04 years, compared with 36.09 years for knowledgeable non-consumers and 39.28 years for those with no prior knowledge, a difference that was highly significant. Yet gender and education level, factors often assumed to shape food choices, showed no significant influence whatsoever. Instead, religion and profession emerged as powerful discriminators, both with p values below 0.001. Merchants made up 92.6 percent of the consumer group, while students dominated the knowledgeable non-consumer group at 93.5 percent and civil servants the non-knowledgeable group at 97.4 percent. The pattern points to a sector whose growth is currently governed less by individual preference than by proximity to commercial circuits.

Among actual consumers, the picture was one of an early-stage market still finding its footing. The duration of consumption was almost perfectly evenly distributed across four time categories, from less than six months to more than three years, suggesting the product attracts newcomers while retaining long-term users. Motivations for first consumption were similarly balanced: curiosity accounted for 25.9 percent, recommendations from close people 24.7 percent, and perceived health benefits 24.7 percent. Discovery channels were likewise scattered across word of mouth, advertising, markets, and social media. This diversity challenges the common assumption that health messaging is the primary engine of alternative dairy adoption; in northern Benin, social influence and simple exploratory behavior appear equally decisive.

But the consumer group also exposed the sector’s structural weaknesses with unusual clarity. While 54.3 percent of consumers found the price acceptable, 25.9 percent considered it too high. Accessibility was rated as very good by only 40.7 percent, with nearly 60 percent reporting at least occasional difficulty obtaining the products. Most striking of all, 82.7 percent of consumers judged the promotion of goat milk products to be insufficient, a result that was highly significant. Even people who already buy and enjoy the products feel the sector is nearly invisible, a communication gap that the authors identify as a major constraint on market development.

The knowledgeable non-consumers told perhaps the most important story of the study. Their reasons for not consuming goat milk were spread almost evenly across product unavailability, unappealing taste, uncertain quality, high price, and preference for cow milk, with no single factor dominating. Their perceptions of the benefits were similarly uncertain: 25.97 percent believed goat milk was worse than cow milk, 24.68 percent were unsure, only 23.38 percent considered it beneficial, and 25.97 percent had no opinion. Familiarity with a product, in other words, does not automatically translate into knowledge of its properties. Yet this group was far from hostile. Cheese and yogurt each attracted the interest of 33.77 percent of respondents as products they might try, slightly ahead of fresh milk, hinting that processed forms, in which the characteristic goat flavor is attenuated, could serve as entry points for hesitant buyers.

The third group, people with no prior knowledge of goat milk, delivered the most optimistic findings. Half said they would try the products if given the opportunity, and another 25.64 percent would do so if provided with more information. Two-thirds, 66.67 percent, said they could potentially consider goat milk as an alternative to cow milk, and the same proportion indicated they would consume goat milk if it were locally produced. When asked which product they would most like to try, goat milk itself led at 46.15 percent, ahead of cheese at 28.21 percent and yogurt at 25.64 percent. The conditions these respondents attached to trying the products, including price reductions, better availability, recommendations from relatives, and proof of benefits, mirror the barriers reported by the other groups, reinforcing the conclusion that the obstacles are informational and economic rather than sensory or cultural.

The authors are careful to acknowledge the limits of their work. The survey covered only two localities, so the findings cannot be generalized to all of Benin’s ecological and cultural regions. The study did not systematically examine sensory dimensions such as taste and smell, which previous research has shown can be decisive for acceptance or rejection, nor did it explore in depth the cultural and traditional beliefs that shape deeply rooted eating behaviors. Because the data are cross-sectional, collected over a limited period, they capture a snapshot rather than a trajectory; perceptions may well evolve as availability improves and awareness campaigns take hold, suggesting a need for longitudinal follow-up.

Even with those caveats, the implications are substantial for anyone invested in West African food security and smallholder livelihoods. Goats are among the most widespread livestock species in Benin, valued for their adaptability and low production costs, yet their contribution to national milk production remains marginal because systems are oriented toward meat. Goat milk itself is nutritionally compelling, with high digestibility, a fatty acid profile rich in short- and medium-chain fatty acids, and substantial calcium and phosphorus, properties of particular relevance for children, the elderly, and people with cow milk intolerance. The new evidence suggests that unlocking this potential requires no single magic bullet but rather group-specific strategies: awareness campaigns on nutritional and health benefits aimed at the uninformed, improved availability, affordability, and quality assurance for the hesitant, and stronger distribution networks and marketing for everyone. The barrier, the study concludes, is not the product. It is the pipeline that connects it to the people who, by all indications, are ready to drink it.

Subject of Research: Consumer perceptions and acceptance of goat milk and its derived products in northern Benin

Article Title: Perceptions and attitudes of consumers and non-consumers towards goat milk and its derived products in northern Benin

Article References: Offoumon, O. T. L. F., Assani, A., Sanni Worogo, H. S., Okambawa, T., Zorobouragui, L., Adambi Boukari, Z. F., Alabi, C. A. D., Idrissou, Y., Attakpa, E. Y., & T. Alkoiret, I. (2026). Perceptions and attitudes of consumers and non-consumers towards goat milk and its derived products in northern Benin. Pastoralism: Research, Policy and Practice, 16, Article 16705. https://doi.org/10.3389/past.2026.16705

Image Credits: AI Generated

DOI: 10.3389/past.2026.16705

Keywords: goat milk, dairy products, consumer behavior, Benin, West Africa, food security, smallholder farmers, dairy value chain, consumer perceptions, market access, nutrition, livestock

The researchers began with fresh goat and cow milk obtained from dairy farms, freeze-dried the samples, and reconstituted them to a standardized protein concentration of 1.5 grams per 100 milliliters. They then subjected both milks to a two-step static digestion model designed to mimic the infant gastrointestinal environment. Gastric digestion was simulated at pH 5.3 and 37 degrees Celsius for one hour using pepsin, followed by intestinal digestion at pH 6.6 for two hours with trypsin and bile salts. The reaction was halted by heating, and the resulting digesta were centrifuged to separate the soluble fraction for analysis. It is worth noting, as the authors themselves emphasize, that this static model does not fully reproduce the dynamic conditions of a real infant gut, including gradual acidification, peristalsis, and gastric emptying, so the findings represent a carefully controlled first approximation rather than a clinical verdict.

The first and perhaps most striking result concerned digestibility. When the milks hit the simulated gastric environment, both formed curd particles, but the curds from goat milk were visibly smaller than those from cow milk, a difference that matters because smaller particles present more surface area to digestive enzymes. When the team measured the degree of hydrolysis, a quantitative indicator of how many peptide bonds had been cleaved, goat milk scored significantly higher than cow milk, with a statistical significance of p less than 0.01. This aligns with earlier work showing that goat caseins tend to be digested more efficiently than cow caseins, and with reports that the true ileal protein digestibility of goat milk-based formula reaches 78.3 percent compared with 73.4 percent for cow milk-based formula under simulated infant conditions. The structural basis for this advantage likely lies in the differing casein composition of the two milks and the smaller fat globules in goat milk, which give it a larger specific surface area for lipase contact.

Peptide profiling added a molecular dimension to the story. After simulated digestion, the researchers identified 215 distinct small peptides in goat milk digesta and 206 in cow milk digesta, with only 41 peptides shared between the two. The majority of peptides in both milks fell in the range of 5 to 13 amino acid residues, indicating substantial protein breakdown, but the length distributions differed in telling ways. Functional annotation using the BIOPEP database revealed that the released peptides were most enriched in angiotensin-converting enzyme inhibitors, followed by antioxidant and antibacterial sequences, with cow milk yielding a broader range of functional categories. Notably, both milks released the same immunomodulatory peptide, NPWDQVKR, while cow milk digesta contained several additional immunomodulatory sequences. The allergenicity picture was more nuanced: goat milk produced a greater number of peptides predicted as allergenic by the AllerTOP algorithm, but the abundance of those predicted allergenic peptides was lower than in cow milk. The authors caution that these are computational predictions, not validated immunological measurements, and that larger polypeptides above 3 kilodaltons, including major allergens such as alpha-s1 casein and beta-lactoglobulin, were excluded from the analysis and may retain allergenic epitopes.

To probe the immunological consequences of digestion, the team turned to human colonic organoids, three-dimensional cultures of intestinal epithelial cells that form closed, gut-like cavity structures. The organoids expressed the epithelial markers EPCAM and MUC-2, confirming a successfully differentiated model. When treated with diluted, filter-sterilized digesta from either milk, the organoids responded in a way that distinguished the two sources. Both goat and cow milk digesta significantly upregulated the gene expression of the pro-inflammatory cytokine IL-1beta, but only cow milk digesta triggered a significant rise in IL-6, another pro-inflammatory signal. Neither milk affected the anti-inflammatory cytokine IL-10 or TNF-alpha. The authors are careful to note that inducing pro-inflammatory cytokines is not the same as causing allergy, which requires specific IgE and Th2 responses, but the data do suggest a differential pro-inflammatory potential between the two digested milks. They also acknowledge that the organoids were adult-derived rather than infant-derived, a limitation they hope future work will address with infant intestinal models and protein-level cytokine measurements.

The second half of the study moved downstream to the hindgut, where undigested milk components become fuel for the resident microbiota. Using fecal samples from ten exclusively formula-fed infants aged 4 to 11 months, the researchers set up anaerobic in vitro fermentation systems containing dialyzed digesta from goat or cow milk, with plain medium as a control. One of the most immediately measurable outcomes was gas: supplementation with goat milk digesta significantly reduced total gas production over the 24-hour fermentation period compared with the control, a finding that may resonate with parents familiar with fussiness and bloating in formula-fed babies, though the authors stress that the gap between an in vitro system and clinical symptoms demands further investigation in animals and humans.

Sequencing of the 16S rRNA gene revealed that both milks reshaped the infant fecal microbial community in overlapping but distinguishable ways. The two milks shared 22 of their differentially abundant genera, and both significantly enriched Ligilactobacillus, a genus generally considered beneficial for infant intestinal health, while tending to increase Bifidobacterium. Both milks also significantly reduced the phylum Desulfobacterota, a group that has received little attention in milk-driven microbiome studies but which the authors suggest may be a shared target of microbial regulation. The divergence emerged in the details: goat milk uniquely boosted Lacticaseibacillus, a genus associated with microbial colonization, bacteriocin synthesis, and the promotion of beneficial bacteria, whereas cow milk elevated Salinivibrio and Acinetobacter. Meanwhile, genera linked to colonic inflammation and disease, such as Streptococcus and Colidextribacter, were depressed by one or both interventions. LEfSe analysis identified Ligilactobacillus as the characteristic biomarker for both milk groups.

Untargeted metabolomics of the fermented samples, which identified 1,704 metabolites, showed that both milks profoundly altered the metabolic output of the infant gut community, with 615 differential metabolites in the goat milk comparison and 589 in the cow milk comparison, 512 of them shared. The dominant enriched pathway for both milks was phenylpropanoid biosynthesis, but the secondary pathways diverged sharply. Goat milk digesta shifted metabolism toward tryptophan metabolism, steroid degradation, and cortisol synthesis, while cow milk digesta enriched ABC transporters, neuroactive ligand-receptor interactions, and nicotinate and nicotinamide metabolism. Correlation analysis strengthened these distinctions. In the goat milk system, the metabolites 2-amino-3-carboxymuconic acid semialdehyde and quinolinic acid, both downstream products of the kynurenine pathway of tryptophan catabolism, correlated strongly with Lacticaseibacillus and other goat-specific genera, pointing to enhanced tryptophan catabolism. In the cow milk system, melatonin, L-aspartic acid, p-octopamine, and sinapic acid correlated with the cow-specific genera, and the authors note that gut bacteria can synthesize melatonin from tryptophan and that melatonin supports gut barrier function and microbial homeostasis.

Taken together, the study sketches two distinct functional identities for the two milks. Goat milk digests more completely under simulated infant conditions, generates a lower abundance of predicted allergenic small peptides, reduces fermentation gas, and appears to steer the hindgut community toward enhanced tryptophan catabolism. Cow milk, by contrast, provoked a stronger pro-inflammatory response in colonic organoids but was associated with elevated melatonin and L-aspartic acid, compounds with recognized protective and immunomodulatory roles. The authors are appropriately measured about the implications, emphasizing that the static digestion model, adult-derived organoids, computational allergenicity predictions, and descriptive correlation analyses all impose limits on interpretation. What the study delivers is the most systematic in vitro characterization to date of how goat and cow milk behave, molecule by molecule and microbe by microbe, as they pass through an approximation of the infant digestive system. The next steps, dynamic digestion models, infant-derived intestinal tissue, functional allergy assays, and eventually clinical trials, will determine whether these laboratory distinctions translate into meaningful differences in how babies thrive on the two milks that dominate infant formula production worldwide.

Subject of Research: Comparative simulated gastrointestinal digestion of goat and cow milk in infants, including peptide profiles, immunomodulatory effects, and gut microbiota modulation

Article Title: Goat and cow milk merits distinct nutritional and functional properties based on simulated gastrointestinal digestion of infant

Article References: Chen, J., Zhu, R., Wu, L., Kuang, J., Bian, X., Li, X., Wang, W., Kang, W., Mu, S., Liu, B. Y., Zhao, K., & Li, J. (2026). Goat and cow milk merits distinct nutritional and functional properties based on simulated gastrointestinal digestion of infant. Food Chemistry: X, 39, Article 104582. https://doi.org/10.1016/j.fochx.2026.104582

Image Credits: AI Generated

DOI: 10.1016/j.fochx.2026.104582

Keywords: goat milk, cow milk, infant digestion, simulated gastrointestinal digestion, peptidomics, gut microbiota, colonic organoids, bioactive peptides, allergenicity, metabolomics, infant formula, tryptophan metabolism

The motivation is stark. Epidemiological projections cited in the study estimate that roughly 589 million adults were living with diabetes in 2024, a figure expected to climb to about 852.5 million by 2050. Gout cases, meanwhile, are projected to reach 95.8 million globally by mid-century. Current drugs such as acarbose, sitagliptin and allopurinol work well but carry drawbacks, from gastrointestinal discomfort to rare but serious hypersensitivity reactions. That has pushed researchers toward food-derived bioactive peptides, which offer high bioavailability and low toxicity as candidates for nutritional intervention.

Goat milk proteins, dominated by caseins and whey proteins, are attractive raw material because goat milk is more digestible and less allergenic than cow milk. Yet most goat milk products remain traditional powders with low added value. The team, led by Xinru Yu and Guowei Shu, set out to change that by asking a question few had tackled: could a single goat milk hydrolysate inhibit enzymes relevant to both glucose regulation and uric acid production at the same time?

The answer required finding the right enzymes for the job. The researchers screened nine food-grade proteases, hydrolyzing reconstituted goat milk for five hours and measuring the degree of peptide bond cleavage along with inhibitory activity against alpha-glucosidase, which breaks down dietary carbohydrates; dipeptidyl peptidase-IV, or DPP-IV, the incretin-degrading enzyme targeted by sitagliptin; and xanthine oxidase, the purine-metabolism enzyme blocked by allopurinol. Alkaline protease produced the deepest hydrolysis, but papain stood out for inhibitory power, achieving up to 53.37 percent alpha-glucosidase inhibition and 97.08 percent DPP-IV inhibition, while a neutral protease delivered the strongest xanthine oxidase blockade.

Because single enzymes rarely produce a peptide mix that hits all three targets, the team combined the four best performers. After testing stability under simulated gastrointestinal digestion and heat treatments mimicking pasteurization, the papain plus neutral protease pairing emerged as the winner. The optimal ratio, determined on an activity-unit basis, was one part papain to two parts neutral protease. Response surface methodology with a Box-Behnken design then fine-tuned the process, revealing that lower enzyme dosage, moderate temperature and extended time favored activity. The final recipe: 3000 units of enzyme per gram of protein at 50 degrees Celsius for roughly 4.1 hours.

Validation experiments confirmed the model’s predictions. Under optimized conditions, the hydrolysate inhibited alpha-glucosidase by 73.05 percent, DPP-IV by 88.63 percent and xanthine oxidase by 80.69 percent, matching the predicted values within statistical error. Benchmarking against standard curves showed the hydrolysate performed comparably to 68 micrograms per milliliter of acarbose, 2.87 micrograms per milliliter of sitagliptin and 64.73 micrograms per milliliter of allopurinol in the respective in vitro assays, though the authors caution that such comparisons serve only as internal references for complex peptide mixtures.

To find the molecules behind the activity, the team filtered the hydrolysate below 10 kilodaltons, separated it by preparative chromatography and analyzed the most potent fraction by liquid chromatography-tandem mass spectrometry. Twenty-four peptides emerged, mostly from beta-, alphaS1- and alphaS2-casein, with molecular weights between 400 and 1400 daltons. Bioinformatic screening with PeptideRanker and the BIOPEP-UWM database narrowed the field to candidates with predicted activity against multiple targets. Two sequences rose to the top: the tripeptide LRF, predicted to inhibit both alpha-glucosidase and xanthine oxidase, and the seven-residue FLPYPYY, predicted to hit both alpha-glucosidase and DPP-IV.

Molecular docking revealed why these peptides work. FLPYPYY bound alpha-glucosidase with a predicted energy of minus 9.7 kilocalories per mole, anchoring itself through hydrogen bonds to Tyr733, Arg647, Glu767 and Gly766, while LRF formed hydrogen bonds with Asp649, Arg653, Glu788 and Gly766. FLPYPYY also docked into DPP-IV with minus 8.8 kilocalories per mole, engaging Trp629, Trp627 and Tyr547 through pi-pi interactions, and LRF bound xanthine oxidase at minus 7.2 kilocalories per mole. Redocking of co-crystallized ligands produced root-mean-square deviations below 2 angstroms, validating the protocol.

The docking snapshots were then stress-tested in 100-nanosecond molecular dynamics simulations using GROMACS with the Amber99SB-ILDN force field. All four peptide-enzyme complexes stabilized, with backbone RMSD values settling between 0.10 and 0.18 nanometers, radius of gyration and solvent-accessible surface area remaining steady, and free-energy landscapes showing well-defined low-energy basins. MM/PBSA calculations over the final 10 nanoseconds yielded binding free energies of minus 4.16 to minus 23.79 kilocalories per mole, with van der Waals and electrostatic terms favoring association and per-residue decomposition pinpointing energetic hotspots such as Phe735 and Tyr636 in alpha-glucosidase and Arg560 in DPP-IV.

The authors are careful to note the limits of the work. Docking and simulation cannot by themselves prove enzyme inhibition, and the identified peptides still need synthesis, concentration-response testing, IC50 determination and kinetic or structural validation before any functional-food claim can be made. Bioavailability, safety and physiological effects in humans remain open questions. Still, the study demonstrates a compelling pipeline: from a humble carton of goat milk to computationally vetted, dual-target peptide candidates, offering dairy producers a route to higher-value products and offering metabolic-disease researchers a fresh trove of molecules to investigate.

Subject of Research: Multifunctional enzyme-inhibitory peptides generated from goat milk proteins by optimized enzymatic hydrolysis

Article Title: Optimization of enzymatic hydrolysis for generating potential multifunctional peptides from goat milk: Bioactivity evaluation, structural characterization and molecular interaction analysis

Article References: Yu, X., Shu, G., Hu, W., Zhang, G., Xie, P., Song, K., & Li, G. (2026). Optimization of enzymatic hydrolysis for generating potential multifunctional peptides from goat milk: Bioactivity evaluation, structural characterization and molecular interaction analysis. Food Chemistry: X, 39, Article 104517. https://doi.org/10.1016/j.fochx.2026.104517

Image Credits: AI Generated

DOI: 10.1016/j.fochx.2026.104517

Keywords: goat milk, bioactive peptides, enzymatic hydrolysis, alpha-glucosidase, DPP-IV, xanthine oxidase, molecular docking, molecular dynamics, diabetes, hyperuricemia, functional food, response surface methodology

Researchers led by Shanshan Han and Xiaoyu Wang set out to test whether Astragalus polysaccharides, bioactive macromolecules extracted from the medicinal herb Astragalus membranaceus, could reshape the quality profile of late lactation goat milk in ways that differ from conventional probiotic supplementation. Astragalus polysaccharides, commonly abbreviated APS, have attracted scientific attention for their stability, immunomodulatory properties, and potential metabolic effects. Previous work in heat-stressed dairy cows linked APS intervention to shifts in serum metabolites connected with glucose metabolism, amino acid metabolism, glutathione metabolism, and prolactin signaling, while separate studies reported improved oxidative stability in Cashmere goats receiving Astragalus supplementation. What remained unclear was whether APS could produce coordinated changes in the actual composition of goat milk, spanning everything from bulk nutritional traits to volatile fingerprints and molecular signatures, and whether those changes would look different from what probiotics achieve.

To find out, the team recruited thirty clinically healthy Saanen dairy goats from a commercial farm in Xi’an, China, all in late lactation at roughly 260 days in milk, with balanced parity and baseline milk yields of about 1.2 kilograms per day. Animals with a history of mastitis or recent antibiotic treatment were excluded. After a seven-day acclimatization period, the goats were randomly assigned to two groups of fifteen. One group received a basal total mixed ration top-dressed with five grams per head per day of a composite microbial agent containing Lactobacillus plantarum, Bacillus subtilis, and Saccharomyces cerevisiae. The other received the same ration supplemented with five grams per head per day of feed-grade Astragalus polysaccharide powder with 55 percent polysaccharide purity. The trial ran for thirty days, with milk samples collected at the start and end of the intervention under strict hygienic protocols, snap-frozen in liquid nitrogen, and coded so that analytical personnel remained blind to treatment assignments. All animal procedures followed ARRIVE guidelines and were approved by the Animal Ethics Committee of the Bio-Agriculture Institute of Shaanxi.

The analytical arsenal deployed on these samples was formidable. Conventional composition, including fat, protein, lactose, dry matter, milk urea nitrogen, and somatic cell count, was measured with a CombiFoss FT+ analyzer. Volatile-related sensory profiles were digitized using a PEN3-Plus electronic nose equipped with ten metal oxide semiconductor sensors covering sensitivities to aromatic compounds, nitrogen oxides, sulfur-containing compounds, alkanes, alcohols, and more. The proteome was quantified using data-independent acquisition mass spectrometry on an Orbitrap Astral instrument, with identification controlled at a one percent false discovery rate against the goat protein database. Untargeted metabolomics was performed on an Orbitrap Exploris 480 in both positive and negative ionization modes, while lipidomics employed a Q Exactive mass spectrometer with methyl tert-butyl ether extraction to capture the full lipid repertoire. Supervised multivariate models were rigorously validated with seven-fold cross-validation and two hundred permutation tests to guard against overfitting.

The conventional composition results immediately revealed two divergent response profiles. In the probiotic group, milk fat percentage increased significantly, accompanied by a parallel rise in total solids, suggesting the probiotic effect was largely driven by the fat fraction. Milk urea nitrogen, a widely used indicator of nitrogen utilization efficiency, rose markedly in the probiotic group, a pattern generally associated with less efficient nitrogen use. The APS group told a different story. Milk fat percentage fell significantly relative to baseline, total solids did not increase, and milk urea nitrogen dropped by 6.20 milligrams per deciliter, a reduction the authors interpret as a more favorable nitrogen-use profile. Lactose remained stable in both groups, indicating that the aqueous secretory characteristics of milk were preserved, and protein percentage showed a non-significant upward tendency of 0.42 percent under APS. Somatic cell counts, an indicator of udder health, did not change in either group, providing a stable background against which to interpret the other shifts.

The electronic nose data added a sensory dimension to this divergence. Radar plots of the ten sensor channels showed that the probiotic group’s volatile fingerprint remained broadly similar to its baseline, with only modest expansion. The APS group, by contrast, displayed a pronounced expansion of its sensor response polygon, particularly in the W5S, W2W, and W1S channels, which respond broadly to nitrogen oxide-related compounds, sulfur-containing and aromatic compounds, and methane-related or broad-range volatile classes. Principal component analysis confirmed that APS endpoint samples shifted clearly away from their baseline distribution and formed a distinct cluster, while probiotic endpoint samples stayed closer to the center. Loading analysis identified W5S as the dominant contributor to the separation, and the authors note the intriguing coincidence that lower milk urea nitrogen and a strong W5S response, both nitrogen-related indicators, changed in parallel under APS supplementation.

Proteomic profiling deepened the picture. APS endpoint samples separated clearly from their baselines in principal component space, whereas probiotic samples did not, indicating a stronger proteomic shift under APS. Functional enrichment analysis showed that proteins increased after APS supplementation were annotated mainly to starch and sucrose metabolism, aminoacyl-tRNA biosynthesis, glycolysis and gluconeogenesis, nucleotide metabolism, and sphingolipid signaling pathways, while decreased proteins mapped to cholesterol metabolism and various glycan biosynthesis and degradation pathways. A heatmap of the top fifty differentially abundant proteins revealed two opposing protein modules: a probiotic-associated module containing fibrinogen gamma chain, complement component 9, lipoprotein lipase, and other extracellular matrix and immune-related proteins, and an APS-associated module enriched in heat shock protein 90 beta, calreticulin, protein disulfide isomerases, calnexin, asparagine synthetase, and glycolytic enzymes such as lactate dehydrogenase A and glyceraldehyde-3-phosphate dehydrogenase.

Targeted inspection of lipid metabolism proteins sharpened the APS signature further. Compared with baseline, the APS group showed elevated abundance of acetyl-CoA carboxylase alpha, fatty acid synthase, and ATP citrate lyase, with fold changes of 1.49, 1.70, and 2.52 respectively, enzymes central to acetyl-CoA supply, malonyl-CoA formation, and fatty acid biosynthesis. NADPH-generating enzymes, including isocitrate dehydrogenase 1, glucose-6-phosphate dehydrogenase, and 6-phosphogluconate dehydrogenase, also rose, with the latter two increasing more than two-fold, providing the reducing equivalents that lipid biosynthesis demands. Meanwhile lipoprotein lipase abundance fell dramatically to 0.26 of baseline, suggesting a redistribution of lipid-processing capacity rather than a blanket increase. The probiotic group showed only mild changes in the same protein set, reinforcing the distinctness of the APS response.

The metabolomic and lipidomic layers completed the molecular portrait. Untargeted metabolomics identified 904 differential metabolites in the APS group versus 587 in the probiotic group, with lipid-related metabolites and organic acids, including tricarboxylic acid cycle intermediates such as citrate and malate, among the prominent responsive categories. Lipidomic profiling detected 2,553 lipid molecules spanning 42 subclasses, with triacylglycerols dominating at more than 88 percent of total lipid signal as expected for mammalian milk. Within that architecture, APS supplementation was associated with a 1.12-fold increase in total triacylglycerol signal, enrichment of medium-chain triacylglycerol species containing C6:0, C8:0, and C10:0 acyl groups, which are characteristic contributors to goat milk flavor after lipolysis, and a coordinated remodeling of polar lipids. Phosphatidylethanolamine and phosphatidylcholine, major components of the milk fat globule membrane, increased approximately 1.4-fold and 1.5-fold respectively, while ceramide rose nearly five-fold and sphingomyelin declined, an inverse pattern the authors interpret as sphingolipid compositional remodeling within the milk matrix.

Finally, an integrated correlation network linking proteins, lipids, metabolites, and electronic nose responses tied the layers together. Glucose-6-phosphate dehydrogenase and fatty acid synthase correlated strongly and positively with phosphatidylethanolamine- and ceramide-related lipid features, with correlation coefficients exceeding 0.85, while lipoprotein lipase was strongly negatively correlated with a specific ceramide species at r equal to minus 0.96. Strikingly, the ether-linked phosphatidylcholine species PC(18:0e/22:4) and an oxidized ceramide were positively correlated with W5S- and W2W-related sensor responses at r equal to 0.83, connecting milk polar lipid chemistry directly to volatile-related sensor signals. The authors are careful to frame these findings as association-based and hypothesis-generating rather than causal proof, noting the absence of an untreated control group, the use of milk rather than mammary tissue, and the sensor-level rather than compound-level nature of electronic nose data. Even so, the coherent multi-omics signature, spanning reduced milk urea nitrogen, a distinct volatile fingerprint, enriched lipid-synthesis proteins, and selective remodeling of medium-chain triacylglycerols, membrane phospholipids, and sphingolipids, positions Astragalus polysaccharide as a promising plant-derived, non-microbial nutritional strategy for stabilizing goat milk quality precisely when the industry needs it most.

Subject of Research: Multi-omics analysis of milk quality responses to Astragalus polysaccharide supplementation in late lactation dairy goats

Article Title: Milk-based multi-omics reveals distinct quality signatures associated with Astragalus polysaccharide supplementation in late lactation goats

Article References: Han, S., Wang, P., Hu, Y., Zhang, Q., Wan, K., & Wang, X. (2026). Milk-based multi-omics reveals distinct quality signatures associated with Astragalus polysaccharide supplementation in late lactation goats. Food Chemistry: X, 39, Article 104395. https://doi.org/10.1016/j.fochx.2026.104395

Image Credits: AI Generated

DOI: 10.1016/j.fochx.2026.104395

Keywords: goat milk, Astragalus polysaccharide, late lactation, multi-omics, proteomics, metabolomics, lipidomics, electronic nose, milk urea nitrogen, milk fat globule membrane, probiotics, dairy quality