Q.Why is mule sterile in nature?

Animal breeding is the deliberate improvement of livestock genotype through selective mating, pursued to raise growth rate, milk/meat/egg yield, product quality, disease resistance and reproductive rate. Inbreeding (mating within the same breed for 4–6 generations) raises homozygosity and can trigger inbreeding depression if continued unchecked, while outbreeding (mating unrelated animals) introduces favourable new genes through out-crossing, cross-breeding (which produces hybrid vigour/heterosis) or interspecific hybridization (such as the mule, from a donkey and a horse). Two controlled-breeding technologies extend these classical methods: artificial insemination, which injects collected semen into a selected female to raise conception rates, avoid disease transmission and let superior but geographically separated animals be bred together (using thawed, previously …