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首页> 外文期刊>Tropical Animal Health and Production >Relationships between Longevity and Linear Type Traits in Holstein Cattle Population of Southern Africa
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Relationships between Longevity and Linear Type Traits in Holstein Cattle Population of Southern Africa

机译：南部非洲荷斯坦牛种群寿命与线性型性状的关系

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摘要

Relationships between longevity and linear type traits were estimated using data on 34 201 cows with lifetime information and linear type scores. The longevity trait considered was the number of lactations initiated and the linear type traits were rump height, body depth, angularity, rear udder height, fore udder attachment, udder depth, fore teat placement and fore teat length. Fixed effects included in the models were herd year, season of calving and herd–date of classification–classifier and days in milk. Age at first calving and age at classification were included as linear and quadratic covariates. Heritability estimates were low for longevity and moderate for most type traits except rump height and fore teat length. All the phenotypic correlations between longevity and the linear type traits were slightly positive (0.01 to 0.09) except the relationships with rump height and fore teat length which were –0.01 and –0.02, respectively. Genetic correlations between longevity and udder traits as well as angularity were moderate to high and positive (0.22 to 0.48). The only notable negative genetic correlations were longevity with body depth and fore teat length (–0.15 and –0.07, respectively). The genetic correlations suggest that selection for udder traits and angularity should improve longevity in the Holstein cattle population.
机译：使用34201头奶牛的数据，寿命信息和线性型评分来估算寿命和线性型性状之间的关系。考虑的长寿性状是开始泌乳的次数，线性型性状是臀高，体深，棱角，后乳房高度，前乳房附着，乳房深度，前乳头位置和前乳头长度。模型中包括的固定效应是牛群年份，产犊季节和牛群-分类日期-分类器和牛奶天数。初产犊的年龄和分类的年龄包括线性和二次协变量。寿命的遗传力估计值较低，而大多数类型性状的遗传力估计值则中等，除了臀高和前乳头长度。长寿与线性型性状之间的所有表型相关性均呈正相关（0.01至0.09），除了与臀高和前乳头长度的关系分别为–0.01和–0.02。长寿和乳房性状之间的遗传相关性以及棱角呈中等至高和正相关（0.22至0.48）。唯一值得注意的负遗传相关性是寿命与体深和前乳头长度（分别为–0.15和–0.07）。遗传相关性表明，选择荷斯坦奶牛性状和角质应提高荷斯坦牛的寿命。

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