Estimation of genetic and maternal effects in crossbred cattle of Angus, Charolais and Hereford parentage. III. Optimal breed composition of crossbreds.
Estimation of genetic and maternal effects in crossbred cattle of Angus, Charolais and Hereford parentage. III. Optimal breed composition of crossbreds.
复制标题
安格斯、夏洛莱和赫里福德杂交牛的遗传和母体影响的估计。
DOI：
10.2527/jas1981.532347x
复制
发表时间：
1981
影响因子：
3.3
通讯作者：
T. G. Martín
中科院分区：
文献类型：
--
作者：
R. Alenda;T. G. Martín
在杂交群体中估计遗传效应和母体效应的方法被推广和推广，以允许估计最优的品种组合。效应系数用通过父本(PIS)、母本(PID)和母系(PíS)从给定亲本品种获得基因的概率来表示。这些公式适用于涉及任何数量的品种的杂交。为了图示的目的，从涉及安格斯(A)、夏洛莱(C)和赫里福德(H)品种的数据中获得的205日龄体重的可用遗传和母体参数被用来为A、C和H品种的所有两个品种组合绘制响应面。PIS、PID和PíS的变化范围为0~1。在不同比例的A和C或H和C品种的杂交中，C基因比例的增加导致205日龄重增加，表现面的形状在很大程度上由C品种的品种加性效应决定。个体和母体杂种优势效应影响了不同比例的A和H杂交表现面的形状，并讨论了结果在合成品种形成中的应用。
Methods for estimating genetic and maternal effects in crossbred populations were extended and generalized to allow estimation of optimal breed combinations. Coefficients of the effects were expressed in terms of the probabilities of obtaining genes from a given parental breed through the sire (PiS), dam (PiD) and maternal grandsire (píS). The formulas are applicable to crosses involving any number of breeds. For purposes of graphic presentation, available genetic and maternal parameters for 205-day weight derived from data involving the Angus (A), Charolais (C) and Hereford (H) breeds were used to develop response surfaces for all two-breed combinations of the A, C and H breeds. PiS, PiD and PíS ranged from 0 to 1. In crosses involving varying proportions of the A and C or the H and C breeds, an increased proportion of C genes resulted in increased 205-day weight, and the shape of the performance surface was largely determined by the breed additive effects of the C breed. Individual and maternal heterosis effects influenced the shape of the performance surface of crosses involving varying proportions of A and H. Application of results to the formation of synthetic breeds is discussed.