Joint estimation of (co) variance components and breeding values for mean and dispersion of days from calving to first service in Holstein cow
Heydar Ghiasi A D and Majbritt Felleki B C
+ Author Affiliations
- Author Affiliations
A Department of Animal Science, Faculty of Agricultural Science, Payame Noor University, Tehran, Iran.
B Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, 75007 Uppsala, Sweden.
C The Beijer Laboratories in Uppsala, Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences, 75007 Uppsala, Sweden.
D Corresponding author. Email: ghiasi@ut.ac.ir
Animal Production Science 57(4) 760-766 https://doi.org/10.1071/AN15643
Submitted: 22 September 2015 Accepted: 11 January 2016 Published: 23 May 2016
Abstract
The present study explored the possibility of selection for uniformity of days from calving to first service (DFS) in dairy cattle. A double hierarchical generalised linear model with an iterative reweighted least-squares algorithm was used to estimate covariance components for the mean and dispersion of DFS. Data included the records of 27 113 Iranian Holstein cows (parity, 1–6) in 15 herds from 1981 to 2007. The estimated additive genetic variance for the mean and dispersion were 32.25 and 0.0139; both of these values had low standard errors. The genetic standard deviation for dispersion of DFS was 0.117, indicating that decreasing the estimated breeding value of dispersion by one genetic standard deviation can increase the uniformity by 12%. A strong positive genetic correlation (0.689) was obtained between the mean and dispersion of DFS. This genetic correlation is favourable since one of the aims of breeding is to simultaneously decrease the mean and increase the uniformity of DFS. The Spearman rank correlations between estimated breeding values in the mean and dispersion for sires with a different number of daughter observations were 0.907. In the studied population, the genetic trend in the mean of DFS was significant and favourable (–0.063 days/year), but the genetic trend in the dispersion of DFS was not significantly different from zero. The results obtained in the present study indicated that the mean and uniformity of DFS can simultaneously be improved in dairy cows.
Additional keywords: fertility, hierarchical model, uniformity.
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