Animal Breeding Section, ICAR-National Dairy Research Institute, Eastern Regional Station, Kalyani, West Bengal, 741235, India.
Digital Agriculture Laboratory (DAL), Skolkovo Institute of Science and Technology, Moscow 121205, Russia.
Trop Anim Health Prod. 2021 Mar 21;53(2):218. doi: 10.1007/s11250-021-02638-x.
Pedigree records of 6821 Jamunapari goats of India were collected from 1980 to 2011 and used to evaluate the population structure and genetic diversity in this flock. Animals born between 2009 and 2011 represented the current reference population. The average pedigree completeness index (PCI) and numbers of equivalent complete generations (EqG) were estimated for the entire (PCI = 0.18, EqG = 2.24) and reference (PCI = 0.31, EqG = 3.45) populations. The average generation interval was 3.33 years. The average inbreeding coefficient and the average relatedness were 0.46 and 1.06%, respectively, for the entire population and 0.77 and 3.87% for the reference population. The rate of inbreeding was 0.06% per generation. The effective population size (N), estimated from increases in inbreeding coefficients between the first and third equivalent complete generations, was 52.65, but periodic introductions of unrelated breeding males resulted in average inbreeding levels in the reference population that were lower than those predicted from the estimate of N. Effective numbers of founders (f), ancestors (f), founder genomes equivalents (f), and non-founder genomes (f) were 51, 39, 25.8, and 48.2, respectively. The f/f ratio in the reference population was 1.31 and indicated that occasional bottlenecks had occurred in the population. The 14 most influential ancestors contributed 50% of the genetic variability in the reference population, with a maximum individual contribution of 9.25%. Approximately 1.9% of the initial heterozygosity had been lost from the population, indicating that substantial genetic diversity still exists in this flock.
收集了 1980 年至 2011 年期间印度 6821 只 Jamunapari 山羊的系谱记录，用于评估该群体的种群结构和遗传多样性。2009 年至 2011 年出生的动物代表了当前的参考群体。整个群体（PCI=0.18，EqG=2.24）和参考群体（PCI=0.31，EqG=3.45）的平均系谱完整性指数（PCI）和等效完整世代数（EqG）进行了估计。整个群体的平均世代间隔为 3.33 年。整个群体的平均近交系数和平均亲缘系数分别为 0.46%和 1.06%，参考群体的分别为 0.77%和 3.87%。每代的近交率为 0.06%。从第一代和第三代等效完整世代之间的近交系数增加中估计出有效群体大小（N）为 52.65，但定期引入无亲缘关系的繁殖雄性导致参考群体中的平均近交水平低于从 N 的估计值预测的水平。有效创始人数量（f）、祖先数量（f）、创始人基因组等效数量（f）和非创始人基因组数量（f）分别为 51、39、25.8 和 48.2。参考群体中的 f/f 比值为 1.31，表明该群体偶尔发生过瓶颈现象。14 位最有影响力的祖先对参考群体的遗传变异性贡献了 50%，最大个体贡献为 9.25%。该群体大约损失了 1.9%的初始杂合性，表明该群体仍存在大量遗传多样性。
