Bene Szabolcs, Polgár Péter J, Szűcs Márton, Márton Judit, Szabó Eszter, Szabó Ferenc
1 Institute of Animal Sciences, Georgikon Faculty, Hungarian University of Agriculture and Life Sciences, Deák Ferenc str. 16, H-8360 Keszthely, Hungary.
2 Association of Hungarian Limousin and Blonde d'Aquitaine Breeders, Lőportár str. 16, H-1134 Budapest, Hungary.
Acta Vet Hung. 2022 May 16. doi: 10.1556/004.2022.00008.
Variance, covariance components, heritability, breeding values (BV) and genetic trends in calving interval (CI) of the Limousin population in Hungary were evaluated. A total of 3,008 CI data of 779 cows from three herds in 1996-2016 were processed. For influencing effects GLM method, for population genetic parameters and BV estimation BLUP animal model, for trend analyses linear regression was applied. The average CI obtained was 378.8 ± 3.1 days. The variance distribution components of the phenotype were as follow: age of cow at calving 34.30%, season of calving 26.09%, year of calving 23.00%, sire 7.45%, herd 3.23%, sex of calf 0.33% and type of calving 0.30%. The heritability of CI proved to be low (h2 d = 0.04 ± 0.02 and 0.03 ± 0.02; h2 m = 0.01 ± 0.02). The repeatability was low (R = 0.03 ± 0.02). Based on the phenotypic trend calculation, the CI of cows decreased by an average of 0.60 days per year (R 2 = 0.19; P < 0.05). In case of genetic trend calculation, the average BV of sires in CI increased 0.07 and 0.17 days per year (R 2 = 0.23 and 0.27; P < 0.05).
对匈牙利利木赞牛种群产犊间隔（CI）的方差、协方差成分、遗传力、育种值（BV）和遗传趋势进行了评估。处理了1996 - 2016年来自三个牛群的779头母牛的3008条CI数据。对于影响因素采用广义线性模型（GLM）方法，对于群体遗传参数和BV估计采用最佳线性无偏预测（BLUP）动物模型，对于趋势分析采用线性回归。获得的平均CI为378.8±3.1天。表型的方差分布成分如下：产犊时母牛年龄占34.30%，产犊季节占26.09%，产犊年份占23.00%，父系占7.45%，牛群占3.23%，犊牛性别占0.33%，产犊类型占0.30%。CI的遗传力较低（h2 d = 0.04±0.02和0.03±0.02；h2 m = 0.01±0.02）。重复性较低（R = 0.03±0.02）。基于表型趋势计算，母牛的CI平均每年下降0.60天（R 2 = 0.19；P < 0.05）。在遗传趋势计算中，CI中公牛的平均BV每年增加0.07和0.17天（R 2 = 0.23和0.27；P < 0.05）。
