Households were selected through systematic random sampling from two Kebeles in the district. Researchers analyzed the collected data using descriptive statistics, including frequencies and percentages. As a cross-sectional study, the results characterize the conditions reported in the surveyed area rather than measuring changes in adoption, reproductive performance, milk yield or household income over time.

Farmers reported being attracted to artificial insemination for its potential genetic and productivity benefits, including genetic merit, higher market value of offspring, increased milk production, affordable service costs, early pregnancy diagnosis and reliable service provision. These findings indicate that perceived economic and productivity advantages were important reasons for interest in the technology. However, the survey did not directly demonstrate that use of artificial insemination caused higher milk production, greater offspring value or improved household income among the participating households.

Participants identified several practical and organizational constraints. Limited awareness of artificial insemination’s benefits, insufficient communication among stakeholders, inadequate incentives for AI technicians and limited accessibility of services also impeded adoption or continued use. The authors proposed strengthening technician capacity, improving estrus detection and conception rates, enhancing farmer awareness, improving coordination among stakeholders, and providing adequate incentives and support for service providers.

These recommendations respond to the barriers recorded in the study; because the research did not test the effects of those measures, their prospective benefits remain unquantified. The findings are also geographically limited to the two surveyed Kebeles and should not be taken as a direct assessment of dairy productivity, pregnancy outcomes or economic effects across Tigray as a whole.

Subject of Research: Barriers and opportunities in smallholder dairy-cattle artificial insemination in Tigray, Ethiopia

Article Title: Barriers and opportunities for the use of artificial insemination among dairy cattle smallholder farmers, Tigray, Ethiopia

Article References: Gebre, Y. H., & Gebru, G. W. (2026). Barriers and opportunities for the use of artificial insemination among dairy cattle smallholder farmers, Tigray, Ethiopia. Discover Sustainability. https://doi.org/10.1007/s43621-026-04752-y

Image Credits: AI Generated

DOI: 10.1007/s43621-026-04752-y

Keywords: artificial insemination, dairy cattle, smallholder farmers, Tigray, Ethiopia, heat detection, conception rates, milk production, cross-sectional survey, livestock services, Barriers, opportunities

The research, conducted on Simmental bulls at an Egyptian livestock training centre, is the first to test this particular pairing in cryopreserved bull semen. Thyroxine, the thyroid hormone better known for regulating metabolism, has previously been shown to kick sperm into a state of hyperactive flagellar motion and to improve the recovery of morphologically normal cells. Melatonin, the pineal gland hormone that governs sleep cycles, is a potent antioxidant that scavenges free radicals and bolsters the cell’s own enzymatic defences. By shrinking melatonin down to nanoparticles roughly 22 nanometres across, the team aimed to squeeze far more protective power out of far smaller doses.

The experimental design was thorough. Over eight weeks, the researchers collected 96 ejaculates from six healthy, fertile Simmental bulls aged three to four years, twice weekly using an artificial vagina warmed to 40 to 42 degrees Celsius. Only samples meeting strict quality thresholds, at least 75 percent progressive motility, a volume of five millilitres or more, fewer than 10 percent abnormal sperm and a concentration of at least one billion sperm per millilitre, were accepted for freezing. Ejaculates from all six bulls were pooled on each collection day to smooth out individual variation, and each pool was treated as a single experimental replicate.

The melatonin nanoparticles themselves were synthesised from pharmaceutical-grade melatonin dissolved in double-distilled water, stirred, ultrasonicated, dried at 45 degrees Celsius and ground for ten hours into a fine homogeneous powder. X-ray diffraction confirmed the crystal structure, field-emission scanning electron microscopy revealed spherical particles with a non-smooth surface, and energy-dispersive X-ray analysis verified purity. The average grain diameter fell from 72 nanometres for bulk melatonin to 22 nanometres for the nano-formulation, and a zeta potential of minus 39.5 millivolts indicated good electrostatic stability in solution, a key factor in keeping nanoparticles from clumping together.

Semen was diluted into a standard Tris-egg yolk-glycerol extender and split into ten treatment groups: an untreated control, three thyroxine concentrations (0.5, 0.75 and 1.0 micrograms per decilitre), three nano-melatonin concentrations (30, 45 and 60 micrograms per decilitre) and three combination groups pairing the corresponding doses. The samples were cooled to 4 degrees Celsius over four hours, loaded into 0.25-millilitre straws and frozen in a programmable biofreezer, plunging at minus 30 degrees per minute down to minus 15 degrees and then minus 50 degrees per minute to minus 140 degrees, before storage in liquid nitrogen. Thawing took just 30 seconds in a 37-degree water bath.

When the thawed sperm were examined with a computer-assisted sperm analysis system tracking roughly 1,500 cells per sample at 60 frames per second, one combination stood out clearly. The pairing of 0.5 micrograms per decilitre thyroxine with 30 micrograms per decilitre nano-melatonin, dubbed T0.5 plus NM30, delivered the highest total motility at 58.31 percent and progressive motility at 52.38 percent, against 41.23 and 36.54 percent respectively in untreated controls. Sperm in this group also swam faster and straighter, posting top values for curvilinear velocity, straight-line velocity, straightness, linearity and beat cross frequency.

Functional tests told the same story. The winning combination produced the best viability at 60.69 percent, acrosome integrity at 75.69 percent, plasma membrane integrity measured by the hypo-osmotic swelling test at 57.23 percent, and mitochondrial membrane potential assessed with JC-10 flow cytometry at 58.77 percent. DNA integrity, evaluated with acridine orange staining, reached 92 percent, the highest of any group. Notably, higher thyroxine doses of 0.75 and 1.0 micrograms per decilitre performed worse than the lowest dose, echoing earlier reports that excessive thyroxine can inhibit cytochrome c oxidase and impair mitochondrial function.

The biochemical data revealed why the combination works. In the T0.5 plus NM30 group, glutathione peroxidase activity climbed to 21.31 nanomoles per minute per millilitre, superoxide dismutase reached 42.08 units per millilitre and total antioxidant capacity hit 2.25 millimolar, all significantly above controls, while malondialdehyde, the classic marker of lipid peroxidation, dropped to 0.61 micromoles per millilitre from 1.29 in controls. Annexin V and propidium iodide flow cytometry showed the combination also shifted cells away from death: viable non-apoptotic sperm rose to 63 percent, while late apoptotic and necrotic fractions fell to 18.46 and 8.39 percent respectively. The authors attribute this to complementary mechanisms, with thyroxine binding receptors outside the nucleus to trigger cyclic AMP and calcium release that fuels motility, and nano-melatonin neutralising reactive species, blocking the mitochondrial permeability transition pore and suppressing caspase-3 activation through pathways including SIRT-1/FOXO-1 and Nrf-2/HO-1.

The most striking result, however, came from the field. Because the lowest-dose combination had performed best in the laboratory, the team reserved it for a live fertility trial. One hundred and forty healthy cyclic cows were synchronised with a GPG hormone protocol and inseminated in August 2025 with frozen-thawed semen from four of the treatment groups, 35 cows each, with duplicate inseminations morning and evening. Pregnancy was confirmed by ultrasound on day 45. Cows receiving the combination semen achieved a conception rate of 82.86 percent, compared with 77.14 percent for nano-melatonin alone, 57.14 percent for thyroxine alone and just 48.57 percent for the control extender, a difference the authors describe as statistically significant.

The implications for the global artificial insemination industry could be considerable, since even modest gains in conception rates translate into substantial economic returns for dairy and beef producers. The nano-formulation is also appealing because it achieves strong effects at doses far below conventional melatonin supplements, which earlier studies have applied at up to 0.7 milligrams per millilitre. The authors caution that their study has limitations, including the use of pooled semen, the absence of molecular validation of the signalling pathways involved and relatively limited nanoparticle characterisation, and they call for future work to unpick the mechanisms underlying the synergy. Even so, the message is clear: a dash of thyroid hormone and a pinch of sleep-hormone nanoparticles may be exactly what frozen bull sperm needs to survive the deep freeze and deliver in the field.

Subject of Research: Effects of thyroxine and nano-melatonin supplementation on cryopreserved Simmental bull semen quality and fertility

Article Title: Synergistic Effects of Thyroxine and Nano‐Melatonin on Post‐Thaw Sperm Quality, Antioxidant Defence and Fertility of Cryopreserved Simmental Bull Semen

Article References: Abonagy, M., Arisha, A., Salama, M., Ashour, M., Shukry, M., Shedeed, S., Shehabeldin, A., El‐Shafai, N., Ibrahim, Z., Mahmoud, S., Saad, M., Alameen, A., Elkhidr, R. Y., Alif, O. H., Khalphallah, A., Elmeligy, E., Khesruf, K. A., Abdelhafez, E. A., & Algabary, A. (2026). Synergistic Effects of Thyroxine and Nano‐Melatonin on Post‐Thaw Sperm Quality, Antioxidant Defence and Fertility of Cryopreserved Simmental Bull Semen. Veterinary Medicine and Science, 12(6), Article e71252. https://doi.org/10.1002/vms3.71252

Image Credits: AI Generated

DOI: 10.1002/vms3.71252

Keywords: cryopreservation, bull semen, thyroxine, nano-melatonin, antioxidant defence, oxidative stress, sperm motility, mitochondrial membrane potential, apoptosis, artificial insemination, Simmental cattle, fertility

Ethiopia holds the largest livestock population in Africa, with roughly 66 million cattle, 46 million goats, 38 million sheep and 41 million chickens. Livestock contribute about 45 percent of agricultural gross domestic product and 13 to 16 percent of total GDP, supplying more than 3.8 billion liters of milk and one million tons of beef each year. Yet the sector is dominated by indigenous breeds: according to the national Central Statistical Agency, 98.24 percent of the country’s cattle are local breeds, with hybrids accounting for just 1.54 percent and exotic breeds a mere 0.22 percent. National milk output falls well short of demand, and the productivity gap between what Ethiopian cows could produce and what they actually produce is one of the defining challenges of the country’s agricultural development.

To understand why, the research team stratified each milk production system into adopters and non-adopters of modern dairy technologies, defining adopters as farmers using at least one improved practice such as artificial insemination or improved forage varieties. Respondents were selected by simple random sampling, with sample size determined using the Yamane formula at a 5 percent precision level. The final sample comprised 141 producers from the urban system, 43 from the peri-urban system and 40 from the rural system. Data were collected through face-to-face interviews using semi-structured questionnaires and analyzed with general linear models in SPSS, treating production system, adoption level and their interaction as fixed effects, with Tukey-adjusted pairwise comparisons and significance declared at p below 0.05.

The reproductive numbers tell a clear story. Crossbred cows reached first service at an average of 20.02 months of age, first calving at 34.30 months, and maintained a calving interval of 11.95 months. Local breed cows lagged far behind, with age at first service of 31.55 months, age at first calving of 45.14 months and a calving interval of 15.09 months. These differences were highly statistically significant across production systems. Reproductive performance matters enormously in dairy economics because every month of delay in first calving or every extension of the calving interval reduces the number of calves and the total liters of milk a cow delivers over her lifetime. The crossbred advantage observed here was shorter than some figures reported elsewhere in Ethiopia, which the authors attribute to differences in feeding and management inputs.

Production performance showed an even starker contrast. Crossbred cows yielded an average of 8.26, 8.31 and 7.05 liters per day in the urban, peri-urban and rural systems respectively, while local cows produced a national-average-level 1.65 liters per day overall. Over a full lactation, local cows gave 355, 294 and 260 liters in the three systems, whereas crossbreds produced 2,374, 2,402 and 2,015 liters. Most tellingly, adopters outperformed non-adopters across the board: average daily milk yield was 9.51 liters for crossbred adopters versus 6.24 liters for non-adopters, and 1.67 versus 1.41 liters for local breeds. Lactation length was 26.1 days longer in adopters’ crossbred cows and 23.4 days longer in their local cows, differences that were highly significant statistically.

Why does adoption matter so much? The study points to the compounding effect of better management. Adopters tend to practice improved feeding, health care, breeding selection, housing and hygiene simultaneously, and these practices reinforce one another. Feed and nutrition alone account for roughly 70 percent of total dairy production costs, and a balanced diet underpins both cow health and milk output. Farmers who treat sick animals promptly, house cows appropriately and breed them at the right time effectively convert the genetic potential of crossbred animals into actual liters of milk. The researchers note that this pattern matches earlier findings from Bangladesh and elsewhere showing higher milk yields among technology adopters, reinforcing the conclusion that the technologies themselves, when actually used, have a positive effect on productivity.

Yet the constraint rankings reveal why so many farmers never make that leap. In feeding, the dominant barriers were the high price and low supply of concentrate feed, shortages of green feed and fodder land, and financial limitations. In calf rearing, shortage of green feed, inadequate farmer knowledge and skill, and shortages of veterinary medicines ranked highest. For housing, land shortage, lack of roofing materials and low awareness topped the list. Breeding services were perhaps the most discouraging bottleneck of all: ill-equipped artificial insemination centers offering negligible service ranked first, followed by inefficient synchronization, inadequate AI knowledge, farmers’ ignorance of mating timing, unskilled technicians and a poor supply of quality bulls. Health constraints included no space to isolate sick animals, poor farmer knowledge of vaccines, weak veterinary infrastructure and poor extension services.

The socioeconomic picture compounds these technical problems. Many farmers lack capital to invest in animals, sheds and feed, credit facilities are scarce, interest rates are high, and training on new technologies is limited. The survey found that 68.3 percent of households were male-headed, that the average farmer was 46.2 years old with a family of 5.3 members, and that 30.3 percent of respondents were illiterate while 45.1 percent had only primary schooling. Education and farming experience both correlated with higher adoption rates, consistent with the idea that awareness and decision-making capacity drive uptake of new agricultural practices. Age showed a negative association with adoption in some cited studies, and family size was statistically larger among non-adopters in rural and urban systems, a pattern the authors suggest may reflect better family management awareness among adopters.

The authors’ conclusion is direct: extension services and the use of improved technologies should be intensified across all milk production systems, but especially in the rural system and among non-adopters, where the productivity gap is widest. Rural households in Genfel, dependent on subsistence farming of teff and sorghum, rely on dairying primarily for household nutrition rather than cash income and have minimal exposure to modern technologies due to lack of finance, knowledge and infrastructure. Bridging that gap, the study argues, would raise cow performance where it matters most for food security. The researchers also flag a critical caveat for future work: the benefits of higher productivity can only be realized if dairy farmers have reliable market access for their milk, a factor that remains to be interrogated in this context. For now, the message from Tigray is that the genetics and the technologies exist; the challenge is getting them into farmers’ hands.

Subject of Research: Dairy cattle productivity and adoption of improved dairy technologies among smallholder farmers in Tigray, northern Ethiopia

Article Title: Dairy cattle performance and technology adoption constraints in Tigray, Northern Ethiopia

Article References: Woldegebriel, D., Atsbha, T., Gebremariam, T., & Begashaw, T. (2025). Dairy cattle performance and technology adoption constraints in Tigray, Northern Ethiopia. BMC Agriculture, 1(1), Article 21. https://doi.org/10.1186/s44399-025-00022-w

Image Credits: AI Generated

DOI: 10.1186/s44399-025-00022-w

Keywords: dairy farming, Ethiopia, Tigray, crossbred cattle, technology adoption, milk yield, artificial insemination, smallholder farmers, reproductive performance, feed constraints, extension services, livestock

The study, led by Rogers Kigoonya of the Namayingo District Local Government together with colleagues at Makerere University, was conducted between July and October 2024. Namayingo is an unusual place for cattle research. The district, which covers 532.9 square kilometers of Lake Victoria territory near the Kenyan border, historically depended on fishing. As fish stocks dwindled, communities transitioned into subsistence farming that integrates small-scale cattle and crop production. Today, of the 11,384 cattle-keeping households in the district, more than half own only one or two animals, and 98.6 percent of the district herd consists of indigenous breeds. Despite the economic importance of these animals, scientific data on their reproductive performance in the district had been almost entirely absent.

To fill this gap, the team used a multi-stage sampling design targeting smallholder farmers in the sub-counties of Buyinja, Buhemba, Banda, and Mutumba. Data came from three sources: physical examination of the cattle, direct observation of farm management practices, and a pre-tested structured questionnaire administered to 90 farmers. Pregnancy status was determined through a combination of farmers’ reports of non-return to heat, visual observation, and rectal palpation performed by a veterinarian using a standardized protocol. Body condition scores were recorded on a five-point scale, and calving intervals were calculated from the two most recent consecutive calvings to minimize recall bias. Farmers with more than six cattle were excluded, keeping the study firmly focused on the smallest production units.

The headline numbers reveal a system operating below its potential. The average calving interval was 13.8 months, exceeding the 12-to-13-month benchmark recommended for achieving one calf per cow per year, the standard reproduction index for profitable cattle keeping. Services per conception averaged 1.48, meaning cows typically required roughly one and a half matings or inseminations before conceiving. Repeat breeding, defined as failure to conceive after three or more services, affected only 2.1 percent of cows, a remarkably low figure that the researchers attribute to the resilience of indigenous breeds. Dystocia, or difficult calving requiring assistance, told a far grimmer story: at 15.2 percent, it was roughly three times the internationally reported rate of less than 5 percent and well above figures documented elsewhere in East Africa.

The dystocia finding is particularly consequential for calf and cow survival. The researchers suggest the high prevalence may stem from the composition of the study herd, since 40.2 percent of cows were primiparous, meaning they were calving for the first time with pelvic structures that are not yet fully developed. In addition, the dominance of indigenous cattle raises the likelihood of mismatches between sire and dam sizes, both through artificial insemination with inappropriate semen and through uncontrolled natural mating with bulls of unknown conformation. Difficult calvings delay the return of ovarian activity, lengthen the time to the next conception, and can permanently damage fertility, making this single statistic a plausible driver of the extended calving intervals observed across the district.

When the team ran multivariable binary logistic regression on pregnancy status, three factors emerged as decisive. Body condition score, a direct proxy for nutritional status, was highly significant, echoing decades of evidence that thin cows suffer from anestrus, delayed conception, and reduced fertility. Housing mattered as well: cows kept in shelters had more than four times the odds of being pregnant compared with cows without any housing (odds ratio 4.24, 95 percent confidence interval 1.34 to 13.45). Shelter reduces environmental stress and protects animals from injuries that compromise fertility. Management system also exerted a strong effect, with tethered cattle showing drastically reduced odds of pregnancy compared with zero-grazed animals, an odds ratio of just 0.033. Alarmingly, 83.3 percent of farmers in the study provided no cattle housing at all, and 76.7 percent relied on communal grazing of natural pastures with no sown or conserved feed.

A generalized linear model applied to calving interval painted a complementary picture of which cows breed back fastest. Age was significant, with cows aged four to eight years showing shorter intervals than animals older than eight, consistent with the declining fertility of aged cows and the delayed ovarian recovery of young ones. Parity also mattered: multiparous cows had shorter calving intervals than biparous cows, likely reflecting physiological adaptations from previous calvings that allow a faster return to estrus, whereas second-calf cows often need longer postpartum recovery. Most strikingly, breeding method proved influential. Cows bred by artificial insemination had significantly shorter calving intervals than those mated naturally, a difference the authors link to planned mating and timely insemination rather than to the biology of the semen itself. Yet in practice, natural mating dominated the district, and only a quarter of farmers kept any records, mostly health or visitor logs, leaving most producers blind to the reproductive trajectories of their own animals.

The findings carry clear implications for extension services and policy. Because housing, body condition, and management system all shaped pregnancy outcomes, interventions do not need to be high-tech to be transformative. Simple shelters, strategic supplementation to improve body condition before breeding, and a shift from tethering toward managed grazing or zero-grazing units could raise pregnancy rates substantially. Expanding access to artificial insemination, paired with sire selection that accounts for the size of indigenous dams, could simultaneously shorten calving intervals and reduce the dystocia rate that currently endangers both cows and calves. Basic record keeping, even a simple notebook of calving and mating dates, would allow farmers to identify non-productive animals and cull or treat them in time. The study’s authors recommend appropriate housing and breeding interventions as the priority actions for Namayingo and for comparable smallholder systems across the region.

Beyond the local context, the research contributes to a broader scientific conversation about why cattle fertility lags across African smallholder systems, where livestock underpin more than 70 percent of rural Ugandan livelihoods and cattle account for roughly 73 percent of the gross value of livestock output. Suboptimal reproduction ripples outward: fewer calves mean fewer replacement animals, less milk, less meat, lower household income, and diminished resilience against climate and market shocks. By identifying specific, modifiable risk factors in a non-traditional cattle-keeping district that transitioned from fishing to farming, the study demonstrates that reproductive decline in small herds is neither inevitable nor purely biological. It is, to a large degree, a management problem with management solutions, and the evidence from Namayingo suggests those solutions are well within reach of the farmers who need them most.

Subject of Research: Risk factors affecting reproductive efficiency of cattle in smallholder production systems in Namayingo district, Uganda

Article Title: Risk factors that undermine reproductive efficiency of cattle in smallholder production systems in Namayingo district in Uganda

Article References: Kigoonya, R., Baluka, S. A., Mugizi, D. R., & Kisira, E. (2026). Risk factors that undermine reproductive efficiency of cattle in smallholder production systems in Namayingo district in Uganda. Discover Animals, 3(1), Article 83. https://doi.org/10.1007/s44338-026-00241-8

Image Credits: AI Generated

DOI: 10.1007/s44338-026-00241-8

Keywords: cattle, reproductive efficiency, smallholder farmers, Uganda, calving interval, dystocia, body condition score, artificial insemination, animal housing, pregnancy status, indigenous breeds, livestock production