Genotype by environment interaction for first-lactation female fertility traits in UK dairy cattle.
Genotype by environment interaction for first-lactation female fertility traits in UK dairy cattle.
复制标题
英国奶牛初乳雌性生育力特征的环境相互作用基因型。
DOI：
10.3168/jds.2008-1844
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发表时间：
2009
影响因子：
3.5
通讯作者：
Mike Coffey
中科院分区：
文献类型：
--
作者：
Erling Strandberg;S. Brotherstone;E. Wall;Mike Coffey
本研究的目的是检查英国使用的各种环境描述符的女性生育力特征是否存在环境相互作用（G x E）的基因型。使用随机回归反应常态模型和多性状模型，对 3,192 个牛群和 1,147 头公牛的约 200,000 头初产荷斯坦奶牛的首次配种天数 (DFS)、56 天不回归率 (NR56)、产犊间隔 (CI) 和授精次数 (NINS) 进行了分析。环境描述符是牛群平均 DFS、CI 和 NR56，以及牛群产量和强度指数，后者基于 305 天的牛奶、脂肪和蛋白质产量、首次产犊日龄、温度和降雨量。未发现 NR56 和 NINS 的 GxE。相对于该性状的群体平均值，DFS 和 CI 的 G x E 表示，但仅来自反应规范模型。 DFS 和 CI 的产量和强度指数均存在环境相互作用的基因型 - 顶部和底部四分位数之间的遗传相关性范围为 0.73 至 0.84，两个模型的结果相似，表明公牛的重新排名。这种 G x E 的部分原因可能是由于牛群的低产量和密集度以及春季产犊更加集中。
The objective of this study was to examine whether there was genotype by environment interaction (G x E) for female fertility traits for various environmental descriptors used in the United Kingdom. Records on days to first service (DFS), nonreturn rate at 56 d (NR56), calving interval (CI), and number of inseminations (NINS) on approximately 200,000 first-lactation Holstein cows in 3,192 herds and from 1,147 sires were analyzed using both random regression reaction norm models and multiple-trait models. The environmental descriptors were herd averages of DFS, CI, and NR56, and herd production and intensity indices, the latter based on 305-d milk, fat, and protein yields, age at first calving, temperature, and rainfall. No GxE was found for NR56 and NINS. There was an indication of G x E for DFS and CI with respect to the herd average of that trait, but only from the reaction norm model. Genotype by environment interaction existed for DFS and CI with respect to both production and intensity indexes-genetic correlations between top and bottom quartiles ranged from 0.73 to 0.84, with similar results from both models, indicating reranking of bulls. Part of this G x E might be explained by low production and intensity herds also having more concentrated spring calving.