美利奴羊、尼尔吉里羊及杂交美利奴羊的繁殖率与活力。I. 繁殖力、产仔数及活力

Reproduction rate and viability of Merino, Nilagiri and halfbred Merino. I. Fertility, prolificacy and viability.

作者信息

Mohan M, Ulaganathan V, Rodricks I M, Bhuvanakumar C K, Iyue M

出版信息

Trop Anim Health Prod. 1986 Aug;18(3):171-6. doi: 10.1007/BF02359530.

Abstract

Lambing records from 482 Merino ewes, 533 Nilagiri ewes and 192 halfbred Merino ewes were used to estimate the number of ewes lambing per ewe inseminated, number of lambs born per ewe lambing, number of lambs weaned per lamb born and number of ewe lambs reaching joining age per ewe lamb weaned. Adult viability was studied by following through the life of 385 Merino ewes, 192 Nilagiri ewes and 61 halfbred ewes in the breeding flock from one and a half to seven and a half years of age. The genetic groups differed significantly for all the reproductive traits but not for adult viability. Lower values of number of ewes lambing per ewe inseminated compared to the number weaned and the number reaching joining age indicate that infertility and embryonic mortality were the main sources of loss.

摘要

482只美利奴母羊、533只尼尔吉里母羊和192只杂交美利奴母羊的产羔记录被用于估算每只授精母羊的产羔母羊数量、每只产羔母羊的产羔数量、每只出生羔羊的断奶羔羊数量以及每只断奶母羔羊达到配种年龄的母羔羊数量。通过跟踪繁殖群中385只美利奴母羊、192只尼尔吉里母羊和61只杂交母羊从一岁半到七岁半的生命历程，研究成年母羊的生存能力。所有繁殖性状在不同遗传群体间差异显著，但成年母羊的生存能力在不同遗传群体间无显著差异。与断奶母羊数量和达到配种年龄的母羊数量相比，每只授精母羊的产羔母羊数量较低，这表明不育和胚胎死亡是主要的损失来源。