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首页> 外文期刊>Journal of Animal Science >Genetic and economic effects of the increase in female paternal filiations by parentage assignment in sheep and goat breeding programs
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Genetic and economic effects of the increase in female paternal filiations by parentage assignment in sheep and goat breeding programs

机译：养羊和山羊养殖计划中父母父族分配增加的遗传与经济效益

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In sheep and goat breeding programs, the proportion of females for which the sire is known (known paternity rate ([KPR]) can be very low. In this context, paternity assignment using SNP is an attractive tool. The annual genetic gain (AGG) is impacted by the accuracy of the EBV. In populations with a low KPR, the number of known relatives for a given individual is low, and the EBV that are based on this information are imprecise. However, the impact of partially known paternal filiations, in terms of potential genetic and economic losses, has never been quantitatively evaluated in situations where natural mating is the main reproductive mode. A deterministic model was developed to assess, for a panel of real breeding programs, the influence of the female KPR on the AGG and economic benefit. First, males were divided into categories according to their status (natural mating or AI sire) and breeding cycle and females according to parity, sire status (including unknown sire), and breeding cycle of the sire. Second, a demographic model described, for each category, the accumulation of known records for individuals and their close relatives. The output from this model was used to compute the average accuracy of the EBV per category. Then, a genetic model based on the gene flow between categories over time was described. Using the average accuracy of EBV per category, it provided the asymptotic AGG of the nucleus given its KPR. In the economic studies, changes to the mean genetic values in the nucleus and the commercial population after an increase in KPR and various gain: cost ratios (monetary gain due to an extra genetic SD of the selected trait divided by the cost of 1 assignment) were considered. Relative profit and payback periods were computed. We showed that SNP-based parentage assignment aimed at increasing the female KPR was not always profitable and that the type of breeding program and the size of the commercial population should be taken into consideration. Notably, achieving a profit was largely dependent on obtaining a favorable gain: cost ratio. The maximum supplementary AGG (16.9%) was obtained for breeding programs using only natural mating. In such programs without AI, a gain: cost ratio of 5 was needed to make assignment profitable at the nucleus level whereas a gain: cost ratio of 2 was sufficient if the nucleus represented a third of the total population.
机译：在绵羊和山羊养殖计划中，已知血型雌性的雌性比例（已知的父级率（[kpr]）非常低。在这种情况下，使用SNP的父级分配是一个有吸引力的工具。年度遗传增益（AGG ）受到EBV的准确性的影响。在具有低KPR的群体中，给定个体的已知亲属的数量低，并且基于该信息的EBV是不精确的。然而，部分已知的父体提式的影响在潜在的遗传和经济损失方面，在自然交配是主要生殖模式的情况下，从未定量评估。制定了一个确定性模型，以评估真正的繁殖计划，女性KPR对此的影响AGG和经济效益。首先，根据其状态（自然交配或AI尺势）和育种循环和女性，根据奇偶地区（包括未知群体）和育种，分为类别胎儿的循环。其次，对每个类别描述的人口模型，为个人和密友的累积记录的累积。此模型的输出用于计算每个类别的EBV的平均精度。然后，描述了基于随时间的类别之间基因流的基因遗传模型。使用每类EBV的平均精度，它提供了核的渐近AGG给予其KPR。在经济研究中，在KPR增加和各种增益增加后对核心和商业人群的平均遗传值的变化：成本比率（由于所选特征的额外遗传SD，由于所选特征的额外遗传SD除以1分配）被认为是。计算相对盈利和投资回收期。我们表明，旨在增加女性KPR的基于SNP的亲子分配并不总是有利可图的，并且应考虑养殖计划的类型和商业人群的规模。值得注意的是，实现利润在很大程度上取决于获得有利的增益：成本比率。使用仅使用自然交配的育种计划获得最大补充agg（16.9％）。在没有AI的这种程序中，获得的增益：5核在核水平盈利所需的5个成本比，而增益：如果核心占总人口的三分之一，则2的成本比足够。

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