Abou Khadiga G, Mahmoud B Y F, El-Full E A
Faculty of Desert and Environmental Agriculture, Fuka, Alexandria University, Matrouh Branch, 51744 Matrouh, Egypt
Faculty of Agriculture, Fayoum University, 63514 Fayoum, Egypt.
Poult Sci. 2016 Apr;95(4):774-9. doi: 10.3382/ps/pev386. Epub 2016 Jan 14.
The objective of the current study was to evaluate a multi-trait selection program based on aggregated breeding values using an animal model Best Linear Unbiased Prediction (BLUP) in Japanese quail. The estimated genetic gain was compared by both mixed model and least squares methods. Data of 1,682 female Japanese quails were collected through four consecutive generations to estimate genetic gain, depending on aggregated breeding values, for age at first egg (AFE), body weight at sexual maturity (BWSM), and days needed to produce the first ten eggs (DN10). Estimates of cumulative selection response were favorable for all the studied traits and significant for AFE (-3.03) and BWSM(10.38), but not significant for DN10(-0.15). Estimates of direct heritability were moderate for AFE (0.21) and BWSM(0.25) but low for DN10(0.08), while estimates of maternal heritability were moderate for AFE (0.19) but low for BWSM(0.04) and DN10(0.01). High (0.45 to 0.56) genetic and low (-0.01 to -0.18) phenotypic correlations were observed among the studied traits. Negative (-0.23 to -0.95) correlations between additive genetic and maternal genetic effects were observed for all traits. Genetic trends were -0.76 (P=0.031), 2.54 (P=0.037), and -0.06 (P=0.052) with calculated product-moment correlations between breeding values, estimated by BLUP and phenotypic selection methods, of 0.78 (P=0.002), 0.77 (P=0.004), and 0.61 (P=0.007) for AFE, BWSM, and DN10, respectively. Aggregated breeding value estimation based on animal model BLUP could be an effective method of constructing a selection program to achieve a favorable selection response in egg production traits in Japanese quail.
本研究的目的是在日本鹌鹑中，使用动物模型最佳线性无偏预测法（BLUP）评估基于综合育种值的多性状选择程序。通过混合模型和最小二乘法比较估计的遗传进展。连续四代收集了1682只雌性日本鹌鹑的数据，以根据综合育种值估计初产蛋龄（AFE）、性成熟体重（BWSM）和产前十枚蛋所需天数（DN10）的遗传进展。所有研究性状的累积选择反应估计值均为有利，AFE（-3.03）和BWSM（10.38）显著，但DN10（-0.15）不显著。直接遗传力估计值在AFE（0.21）和BWSM（0.25）中为中等，但在DN10（0.08）中较低，而母体遗传力估计值在AFE（0.19）中为中等，但在BWSM（0.04）和DN10（0.01）中较低。在所研究的性状之间观察到高（0.45至0.56）遗传相关性和低（-0.01至-0.18）表型相关性。所有性状的加性遗传效应和母体遗传效应之间均观察到负相关（-0.23至-0.95）。遗传趋势分别为-0.76（P=0.031）、2.54（P=0.037）和-0.06（P=0.052），通过BLUP和表型选择方法估计的育种值之间的计算积矩相关性分别为0.78（P=0.002）、0.77（P=0.004）和0.61（P=0.007），分别对应AFE、BWSM和DN10。基于动物模型BLUP的综合育种值估计可能是构建选择程序以在日本鹌鹑产蛋性状中实现有利选择反应的有效方法。
