Genealogical records of 6,631 animals were used to describe the population structure, evaluate the genetic variability, and estimate the effect of inbreeding on the growth traits of Morada Nova sheep. The depth of the whole population was shallow (t = 1.25), that the way we used a reference population (t = 2.99), formed by animals with both parents known and born in the last four year, to make the inferences. For this population, birth weight (BW, n = 220), weaning weight (WW, n = 157), and pre-weaning weight gain (WG, n = 155) were available. The effective numbers of founders (fe) and ancestors (fa) were 43 and 34, respectively; 12 ancestors were responsible for 50% of the genetic variability in this reference population. The effective sizes for maximum, complete, and equivalent generations were 113.63, 41.67, and 60.97, respectively. The effective size, average inbreeding (2.88%), average relatedness coefficient (1.24%), the fe⁄fa (1.26), beyond other results, indicate attention with the future of the breed, which is not comfortable in relation to inbreeding and variability. Inbreeding depression was observed only for BW, where for each one percent increase in the average of individual increase inbreeding there is an average decrease of 0.0751kg in birth weight.

使用 6,631 只动物的家谱记录来描述种群结构，评估遗传变异性，并估计近交对 Morada Nova 绵羊生长性状的影响。整个种群的深度较浅（t = 1.25），我们使用参考种群（t = 2.99）的方式进行推断，参考种群由父母双方都在过去四年中已知且出生的动物组成。对于该人群，可获得出生体重（BW，n = 220）、断奶体重（WW，n = 157）和断奶前体重增加（WG，n = 155）。创始人（fe）和祖先（fa）的有效人数分别为43和34；12 个祖先负责该参考种群中 50% 的遗传变异。最大、完整和等效世代的有效大小分别为 113.63、41.67 和 60.97。有效大小、平均近亲繁殖 (2.88%)、平均相关系数 (1.24%)、fe⁄fa (1.26) 与其他结果相比，表明对该品种未来的关注，这与近亲繁殖和变异性有关. 仅在 BW 中观察到近交抑制，其中近交个体平均增加 1%，出生体重平均减少 0.0751 公斤。