Bene Szabolcs, Kőrösi Zsolt Jenő, Bognár László, Polgár József Péter, Szabó Ferenc
Institute of Animal Sciences, Hungarian University of Agriculture and Life Sciences, Georgikon Campus, Deák Ferenc u. 16, H-8360 Keszthely, Hungary.
National Association of Hungarian Holstein Friesian Breeders, Lőportár u. 16, H-1134 Budapest, Hungary.
Animals (Basel). 2024 Aug 29;14(17):2513. doi: 10.3390/ani14172513.
Calving interval (CI) data (N = 37,263) from 17,319 cows born 2008-2018 in six herds were assessed. The data were made available by the National Association of Hungarian Holstein Friesian Breeders in Hungary. The effects of some genetic and environmental factors, population genetic parameters, breeding value (BV) of sires, and phenotypic and genetic trends of the CI were estimated. The GLM method was used for studying different effects on the CI. BLUP animal model was used for heritability () and BV estimation. Linear regression analyses were applied for the trend calculation. The mean of the CI was 412.2 ± 2.0 days. The of the CI proved to be low (0.07 ± 0.01 and 0.08 ± 0.01). There were relatively high differences among the sires in the estimated BV. Based on the phenotypic trend calculation, the CI of cows showed decreasing direction by an average of 1.80 days per year ( = 0.94; < 0.01). In the case of genetic trend calculation, the average BV of sires in the CI has decreased -4.94 and -0.31 days per year ( = 0.91 and 0.41; < 0.01).
对匈牙利全国荷斯坦弗里生奶牛育种者协会提供的、来自2008年至2018年出生在六个牛群中的17319头奶牛的产犊间隔（CI）数据（N = 37263）进行了评估。估计了一些遗传和环境因素的影响、群体遗传参数、公牛的育种值（BV）以及CI的表型和遗传趋势。采用广义线性模型（GLM）方法研究对CI的不同影响。采用最佳线性无偏预测（BLUP）动物模型估计遗传力（）和BV。应用线性回归分析进行趋势计算。CI的平均值为412.2±2.0天。CI的遗传力较低（0.07±0.01和0.08±0.01）。估计的BV在公牛之间存在相对较大差异。基于表型趋势计算，奶牛的CI呈下降趋势，平均每年下降1.80天（= 0.94；<0.01）。在遗传趋势计算中，CI中公牛的平均BV每年下降-4.94和-0.31天（= 0.91和0.41；<0.01）。
