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Estimation of variance components, genetics trends and parameters for birth weight of Holstein cattle in Iran | ||
| علوم دامی | ||
| Article 1, Volume 29, Issue 112, December 2016, Pages 3-10 PDF (1.53 M) | ||
| Document Type: Research Paper | ||
| DOI: 10.22092/asj.2016.107415 | ||
| Author | ||
| M. Rokouei* | ||
| Abstract | ||
| Birth weight (BW) is the first trait that could be measured after birth. BW influences the growth, production, reproduction, and calving ease of the mother and also affects the future performance of the calf. The 355582 BW records of Holstein cows were used in this research which was recorded by Animal Breeding Center of Iran between 1988 and 2010. The likelihood ratio test showed that the differences between first 5 models and sixth model were significant (P<0.001). The power of test for all comparison was more than 0.999 indicating the best model is sixth model. The estimated direct heritability, maternal heritability and total heritability of best model were 0.269, 0.08 and 0.22, respectively. Also genetics correlation between direct and maternal effects was estimated at -0.38. The genetics trend was increased positively up to 2003 (0.016 ± 0.003 kg), after that, it negatively decreased. The result of genetic trend of BW showed that BW did not included in the breeding programs of dairy herds up to now, and it could be used as a selection index for genetics improvement in the Holstein dairy cattle population. | ||
| Keywords | ||
| Direct Heritability; Maternal Heritability; Total Heritability; Genetics correlation; Dairy cattle | ||
| References | ||
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