In a finding that could reshape how smallholder farmers feed their livestock, researchers in Nigeria report that a humble, sweet tuber long celebrated in folk medicine can measurably improve the reproductive performance of rabbits. In a 52-week breeding experiment conducted at the Federal University of Technology, Akure, scientists fed breeding rabbits pelleted rations containing graded levels of tiger nut (Cyperus esculentus), a nutrient-dense tuber of the sedge family, and tracked the growth and survival of 357 kits born across three consecutive parities. The results, published in the open-access journal Discover Animals, show that diets enriched with tiger nut produced heavier kits at key growth milestones, improved birth weights, and influenced mortality patterns in the critical first week of life. Equally important, the study revealed that genetics, sex, maternal experience, and diet do not act independently: a web of statistically significant interactions among breed, sex, parity, and diet shaped nearly every growth and reproductive trait the team measured.

Rabbits occupy a unique position among livestock. They breed prolifically, gestate for roughly a month, reach sexual maturity early, can be rebred shortly after kindling, and pass through generations quickly — a combination that makes them one of the most economically viable sources of animal protein available to small farmers. Across many developing countries, rabbits have been widely promoted as a practical route to higher household income and better nutrition. Yet the experience of past rabbit production initiatives has exposed a persistent bottleneck: feeding. Grains that might otherwise sustain rabbits are often reserved for human consumption, and poor feeding strategies, particularly during pregnancy and lactation, remain a major constraint on productivity. Lactating does demand energy-dense rations; when nutrition falls short during this window, the health of the doe suffers and the survival and growth of her offspring decline with it. The search for non-conventional, locally available feed ingredients that do not compete with human food has therefore become a central preoccupation of tropical animal science.

Tiger nut offered a promising candidate. The brown variety of this lesser-known crop, a member of the Cyperaceae family, packs high energy value and a favorable amino acid profile, and it is readily available in Nigerian markets. Traditional belief holds that tiger nut enhances lactation and promotes kit growth, but hard scientific evidence for those claims has been thin. To test them, the research team — led by Uchechukwu Ihendu of the Federal University of Technology, Akure, in collaboration with colleagues at Elizade University — assembled 60 growing rabbits as parent stock: 48 does and 12 bucks divided equally among three breeds, the Dutch Belted, the New Zealand White, and the Hyla Max, with 16 does and four bucks per breed. The animals were 20 to 22 weeks old, weighed between 2.0 and 2.5 kilograms at the start, and were given two weeks to acclimatize before breeding commenced. The experiment was approved by the university’s Animal Welfare Committee and conducted in line with European Union directives for laboratory animals.

The breeding program ran for 52 weeks under a pure-line mating system, meaning each doe was bred exclusively with a buck of her own breed. Housed in individual wire-mesh cages measuring 60 by 50 by 40 centimeters within a well-ventilated rabbitry, the animals coped with the hot, humid rainforest climate of Akure, where temperatures average 26.2 degrees Celsius and relative humidity hovers near 78 percent. For mating, each doe was carried to the buck’s cage; ten days after copulation, keepers palpated the does to detect pregnancy, and any female that failed to conceive was returned to the same buck for re-breeding. Nest boxes went into the cages on the 25th day after conception, ahead of kindling, and litters were weaned at 28 days. Across three consecutive parities, the program generated 357 progeny — 114 Dutch Belted, 133 New Zealand White, and 110 Hyla Max — which formed the core of the dataset. Routine health monitoring and veterinary care were maintained throughout.

The experimental diets were built around milled brown tiger nut purchased in an open Nigerian market, cleaned of stones and debris, air-dried, and ground. Formulated with maize, wheat offal, soya meal, groundnut cake, bone meal, limestone, and salt, four pelleted rations were produced containing tiger nut at zero, 10, 20, and 30 grams per kilogram of feed. Pellets were offered in the morning, while fresh forages — Tridax procumbens and Talinum triangulare — were provided in the evening, and every genetic group experienced identical environmental, medication, and management conditions. Kits were weighed individually and as whole litters immediately after birth, then weekly through the fifth week, using a sensitive 10-kilogram scale accurate to 0.01 kilograms. Milk production, which cannot be measured directly in rabbits, was estimated indirectly from the total weight gained by each litter up to 21 days postpartum. The team recorded gestation length, litter size at birth, litter birth weight, pre-weaning mortality, litter size and weight at weaning, and individual kit weights, following protocols set out in United Nations Food and Agriculture Organization guidelines for phenotypic characterization of animal genetic resources.

Statistically, the study leaned on tools built for messy, real-world data. Because litter records produce unbalanced datasets, the researchers applied the Average Information Restricted Maximum Likelihood (AIREML) algorithm within the ASReml software package (version 4.2), fitting mixed linear models that treated breed, sex, parity, and diet as fixed factors and the individual doe as a random effect to absorb repeated measurements across parities. The full factorial design, incorporating every two-, three-, and four-way interaction among the four factors, was tested against the performance traits; fixed effects were judged significant at p < 0.05, and least squares means were computed wherever an effect proved significant. Traits such as gestation length, litter size, birth weight, weaning weight, and weekly body weight were additionally subjected to analysis of variance using the General Linear Model procedure of SPSS, with significant means separated by the New Duncan Multiple Range Test. This two-pronged approach allowed the team to disentangle straightforward main effects from the interaction terms that ultimately proved so consequential.

The dietary results formed the headline. Kits whose mothers received the 30-gram inclusion diet posted the highest body weights at day 14 (0.16 ± 0.00 kilograms) and day 28 (0.29 ± 0.1 kilograms), while the 10-gram diet produced the greatest weight gain by day 28 (1.36 ± 1.14 kilograms) — a reminder that dose–response relationships in animal nutrition are rarely linear. At the reproductive level, both the 30-gram and 10-gram diets yielded significantly higher individual kit birth weights and litter birth weights than the 20-gram and control rations. The authors attribute the boost to the tuber’s high energy content and favorable fiber composition, which likely enhanced both the yield and the quality of milk produced by lactating does; better-nourished does, in turn, raise faster-growing and more survivable kits. The pattern echoes earlier work showing that adequate dietary fat and fiber play crucial roles in optimizing lactation and reproductive outcomes in rabbits, a demanding physiological state in which nutritional shortfalls cascade quickly to the litter.

Breed mattered just as much as the feed. New Zealand White kits were born heavier than all others, posting individual birth weights of 0.05 kilograms against 0.04 for Dutch Belted and Hyla Max — a difference the researchers link to superior prenatal growth conditions, possibly reflecting better placental efficiency and greater maternal body reserves in the breed. Pre-weaning mortality told a different story: Dutch Belted litters lost the highest proportion of kits (15.97 ± 2.85 percent), followed by Hyla Max (13.86 ± 2.63 percent), while New Zealand White again performed best (10.46 ± 2.64 percent). Breed effects on mortality at day 7 followed the same ordering, with Hyla Max suffering the heaviest first-week losses. Sex left its imprint early as well: male kits outweighed females at both day 7 (0.11 versus 0.09 kilograms) and day 14 (0.16 versus 0.15 kilograms), a gap the authors attribute to hormonal influences and inherently different growth rates between the sexes even before weaning — an argument, they suggest, for sex-aware management of early growth.

Parity — the number of times a doe had previously kindled — proved equally consequential. Third-parity does produced the heaviest individual kits at birth (0.05 kilograms), while second-parity litters achieved the highest individual weaning weight (0.38 ± 0.01 kilograms); parity also significantly shaped weight change at day 21 and mortality at birth and at day 7. The pattern points to the maturing of maternal physiology: multiparous does produce more milk, nurse more skillfully, and allocate bodily resources more efficiently than first-time mothers. Yet pre-weaning mortality showed no direct association with parity overall, suggesting that litter size, maternal care, housing conditions, and the doe’s nutritional status can override reproductive order in determining which kits survive. Most striking were the interactions. Breed-by-sex effects shaped mortality at day 28; sex-by-diet combinations rippled through weights at days 7, 21, and 28; and three- and four-way combinations — breed by parity by diet, breed by sex by parity, and the full breed by sex by parity by diet interaction — significantly influenced kit weights during the first two weeks of life. In practical terms, the biology of the rabbitry is not additive: the effect of any single lever depends on the setting of all the others.

For rabbit producers, the practical message is layered. Selecting breeds such as the New Zealand White can lift birth weights and trim pre-weaning losses; managing does through their second and third parities captures peak maternal performance; and blending 20 to 30 grams of tiger nut per kilogram of feed — an ingredient available in local markets at modest cost — appears to improve kit growth while drawing on a resource that never competes with the human dinner plate. The authors argue that the findings carry policy weight as well, supporting livestock development programs that promote alternative feeds to shore up protein supply in developing countries and reduce reliance on conventional ingredients reserved for human consumption. They caution, however, that the story is unfinished: future work should track the long-term effects of tiger nut inclusion on post-weaning performance, carcass characteristics, and economic returns across different production systems. As the interplay of genes, sex, maternal history, and diet comes into sharper focus, the lowly tiger nut may earn a permanent place in the feed formulations that sustain one of the world’s fastest-reproducing farm animals.