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首页> 外文期刊>Journal of dairy science >Genetic Analysis of the Israeli Holstein Dairy Cattle Population for Production and Nonproduction Traits with a Multitrait Animal Model
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Genetic Analysis of the Israeli Holstein Dairy Cattle Population for Production and Nonproduction Traits with a Multitrait Animal Model

机译：基于多性状动物模型的以色列荷斯坦奶牛生产和非生产性状的遗传分析

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摘要

Milk, fat, and protein production, somatic cell score (SCS), and female fertility in the Israeli Holstein dairy cattle population were analyzed using a multitrait animal model (AM) with parities 1 through 5 as separate traits. Female fertility was measured as the inverse of the number of inseminations to conception in percent. Variance components were estimated using both the repeatability AM and multitrait AM. The multitrait heritabilities for individual parities were greater than the heritabilities from the repeatability AM, and heritabilities decreased with an increase in parity number. Heritabilities were higher for production traits, lower for SCS, and lowest for female fertility. The genetic correlations were higher than the environmental correlations. Genetic correlations between parities decreased with an increase in the difference in parity number, but all were greater than 0.5. The environmental correlations were higher for production traits, lower for SCS, and close to zero for female fertility. In the analysis of the complete milk recorded population, genetic trends from the repeatability and multitrait models were very similar. The genetic trend for SCS was economically unfavorable until 1993, and favorable since then. The genetic trend for female fertility was close to zero, but the annual environmental trend was -0.2%. The multitrait lactation model is an attractive compromise between repeatability lactation models, which do not account for maturing trends across parities, and test-day models, which are much more demanding computationally.
机译：以色列荷斯坦奶牛种群中的牛奶，脂肪和蛋白质产量，体细胞评分（SCS）和雌性育性是采用多性状动物模型（AM）进行分析的，其中奇偶校验为1-5。女性受精率是受精次数与受孕次数的倒数。使用重复性AM和多特征AM估计方差分量。单个奇偶校验的多性状遗传力大于可重复性AM中的遗传力，并且遗传力随着奇偶校验数的增加而降低。生产性状的遗传力较高，SCS的遗传力较低，而女性的生育力最低。遗传相关性高于环境相关性。奇偶校验之间的遗传相关性随奇偶校验数差异的增加而降低，但均大于0.5。生产性状的环境相关性较高，SCS的环境相关性较低，而女性生育力的环境相关性接近于零。在对完整记录的牛奶种群进行分析时，来自重复性和多性状模型的遗传趋势非常相似。直到1993年，SCS的遗传趋势在经济上都是不利的，此后一直是有利的。女性生育力的遗传趋势接近于零，但年度环境趋势为-0.2％。多性状泌乳模型是可重复性哺乳模型和测试日模型之间的一个有吸引力的折衷，可重复性泌乳模型不考虑奇偶校验的成熟趋势，而测试日模型则对计算要求更高。

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