尼日尔阿扎瓦克斑马的产奶性状遗传概况及与繁殖性能的相关性分析

IF 1.9 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE Veterinary and Animal Science Pub Date : 2024-05-29 DOI:10.1016/j.vas.2024.100365
Adamou Karimou Ibrahim , Issa Moumouni , Chanono Mogueza
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引用次数: 0

摘要

利用基于 REML 方法的多性状动物模型,从 Toukounous 实验中心(尼日尔)饲养的 471 头阿扎瓦克牛 1275 个完整泌乳期的 11,998 份月产奶记录中,估算了遗传因素对阿扎瓦克牛泌乳性状的影响。结果表明,持续率(h2 = 0.23)、泌乳高峰(h2 = 0.34)、305 天产奶量(h2 = 0.30)、日产奶量(h2 = 0.33)和总产奶量(h2 = 0.35)的遗传率为中等。此外,后四个性状的重复性估计值非常高,从 0.50 到 0.58 不等。两个繁殖性状(初产年龄和产犊间隔)与泌乳性状之间存在 0.23 至 0.40 的显著表型相关。同样,产奶性状与繁殖性状之间的显著遗传相关性也是不利的,根据泌乳性状的不同,初产年龄的相关性从 0.32 到 0.87 不等,产犊间隔的相关性从 0.48 到 0.97 不等。泌乳性状的遗传率估计值与许多功能性繁殖性状的遗传率估计值一样适中,因此仅对产奶量性状进行选择的遗传增益会很快,但与繁殖性能的遗传增益是对立的。
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Genetic profile of milk production traits and analysis of correlations with reproductive performance in the Azawak Zebu in Niger

The effects of genetic factors on the lactation traits of the Azawak cattle breed are estimated from 11,998 monthly milk records from 1275 complete lactations from 471 Azawak cows bred at the Toukounous experimental centre (Niger), using a multi-trait animal model based on the REML method. The results show that heritability was moderate for persistency (h2 = 0.23), peak lactation (h2 = 0.34), milk yield at 305 days (h2 = 0.30), daily milk yield (h2 = 0.33) and total milk yield (h2 = 0.35). In addition, very high repeatability estimates ranging from 0.50 to 0.58 were associated with the last four traits. Significant phenotypic correlations varying from 0.23 to 0.40 existed between the two reproductive traits (age at first calving and calving interval) and the lactation traits. Similarly, the significant genetic correlations between the traits of milk production and reproduction traits were unfavorable, varying according to the lactation traits considered from 0.32 to 0.87 for age at first calving and from 0.48 to 0.97 for calving interval, indicating that selection for milk yield only should result in a longer calving interval and a later age at first calving. Estimates of the heritability of lactation traits are moderate, as are those of many functional reproductive traits, so the genetic gain from selection on milk production traits alone would be rapid, but antagonistic with reproductive performance.

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来源期刊
Veterinary and Animal Science
Veterinary and Animal Science Veterinary-Veterinary (all)
CiteScore
3.50
自引率
0.00%
发文量
43
审稿时长
47 days
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