Heritabilities and genetic and phenotypic correlations of egg quality traits in brown-egg dwarf layers
Heritabilities and genetic and phenotypic correlations of egg quality traits in brown-egg dwarf layers
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DOI：
10.1093/ps/84.8.1209
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发表时间：
2005-08-01
期刊：
影响因子：
4.4
通讯作者：
Yang, N
中科院分区：
文献类型：
--
作者：
Zhang, LC;Ning, ZH;Yang, N
从920只褐矮蛋蛋鸡中随机抽取2，272只蛋，测定蛋高、蛋重、蛋壳颜色、蛋壳指数、蛋壳强度、蛋壳厚度、蛋壳重、蛋重、哈夫单位和蛋黄重等指标。应用限制最大似然法估计这些蛋品质性状的遗传力和基因型与表型相关。蛋高、蛋宽、蛋重、蛋壳指数、蛋壳强度、蛋壳厚度、蛋重、蛋重、哈夫单位和蛋重的遗传力分别为0.51、0.59、0.46、0.40、0.24、0.34、0.64、0.63、0.41和0.45。蛋重与蛋重、蛋重和蛋重的遗传相关系数较高，在0.67 ~ 0.97之间，而蛋重与蛋的外部和内部性状的遗传相关系数较低，在-0.23 ~0.13之间。因此，虽然这些性状的遗传力是中等偏高，与ESC的遗传相关性较低，这表明壳的颜色和物理属性的壳，以及在褐蛋矮蛋鸡的内部鸡蛋质量之间的关系较小。
Albumen height, albumen weight (AW), eggshell color (ESC), eggshell index, eggshell strength, eggshell thickness, eggshell weight (ESW), egg weight (EW), Haugh units, and yolk weight (YW) were measured in 2,272 eggs collected 3 d sequentially from 920 brown-egg dwarf layers caged individually. The restricted maximum likelihood procedure was applied to estimate heritabilities and genotypic and phenotypic correlations for these egg quality traits. Heritabilities of albumen height, AW, ESC, eggshell index, eggshell strength, eggshell thickness, ESW, EW, Haugh units, and YW were 0.51, 0.59, 0.46, 0.40, 0.24, 0.34, 0.64, 0.63, 0.41, and 0.45, respectively. The genetic correlations between EW and AW, YW, and ESW were high ranging from 0.67 to 0.97, whereas those for ESC with external and internal egg quality traits were low ranging from -0.23 to 0.13. Thus although heritabilities for these traits were moderate to high, genetic correlations with ESC were low, suggesting a minor relationship between shell color and physical attributes of the shell as well as internal egg quality in brown-egg dwarf layers.