冰岛奶牛遗传参数随机回归试验日模型

IF 0.2 4区农林科学 Q4 AGRICULTURE, MULTIDISCIPLINARY

Icelandic Agricultural Sciences Pub Date : 2019-01-01 DOI:10.16886/IAS.2019.01

J. Eiríksson, Á. Sigurdsson, Gudmundur H. Johannesson, E. Eythórsdóttir

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引用次数: 3

摘要

利用33,052头奶牛480,495个试验日产量记录，采用随机回归模型估计冰岛奶牛前3次泌乳日产奶量(MY)、脂肪产量(FY)、蛋白质产量(PY)和体细胞评分(SCS)的遗传参数。各性状遗传率在哺乳期早期最低，在哺乳期中后期最高。首次泌乳产奶量的遗传率分别为MY、FY和PY的0.43、0.39和0.41，但使用泌乳模型时估计遗传率较低。首次泌乳时SCS的遗传率采用随机回归模型为0.23，采用泌乳模型为0.15。所有奶牛泌乳持续力MY、FY和PY的遗传率为0.14 ~ 0.24，与整个泌乳SCS的遗传相关性为-0.08 ~ -0.13。产量的遗传率比以前估计的要高。种群中持久性的遗传变异使得通过选择改变泌乳曲线成为可能。

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Genetic parameters for Icelandic dairy cows using a random regression test-day model

A total of 480,495 test-day yield records of 33,052 cows were used to estimate the genetic parameters for daily milk yield (MY), fat yield (FY), protein yield (PY) and somatic cell score (SCS) of Icelandic dairy cows in the first three lactations with a random regression model. Heritability of all traits was lowest in early lactation in all lactations and highest in midor late lactation. Heritability of lactation yields for the first lactation was 0.43, 0.39 and 0.41 for MY, FY and PY, respectively, but was estimated as lower when using a lactation model. Heritability of SCS in the first lactation was 0.23 using the random regression model but 0.15 using the lactation model. Heritability of persistency of lactation MY, FY and PY were 0.14-0.24 in all lactations and genetic correlations to the whole lactation SCS were -0.08 to -0.13. Heritability of yields had increased from previous estimates for the breed. Genetic variation of persistency in the population makes change of the lactation curve possible through selection.

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来源期刊

Icelandic Agricultural Sciences AGRICULTURE, MULTIDISCIPLINARY-

CiteScore

0.80

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Icelandic Agricultural Sciences is published annually, or more frequently. The deadline for submitting manuscripts that are intended to appear within that year is September. The journal is in English and is refereed and distributed internationally. It publishes original articles and reviews written by researchers throughout the world on any aspect of applied life sciences that are relevant under boreal, alpine, arctic or subarctic conditions. Relevant subjects include e.g. any kind of environmental research, farming, breeding and diseases of plants and animals, hunting and fisheries, food science, forestry, soil conservation, ecology of managed and natural ecosystems, geothermal ecology, etc.