NDLI: Estimation of genetic and phenotypic relationships between age at first calving and productive performance in Iranian Holsteins

Content Provider	Springer Nature Link
Author	Ghavi Hossein Zadeh, Navid
Copyright Year	2011
Abstract	Calving records from the Animal Breeding Center of Iran collected from January 1990 to December 2007 and comprising 207,106 first calving events of Holsteins from 2,506 herds were analysed using univariate and bivariate linear sire models to estimate heritabilities and genetic correlations between age at first calving (AFC) and productive performance. Average AFC was 26.48 months in this study. The peak in the frequency distribution of AFC clearly exists coinciding with cows calving for the first time at approximately 25 months of age. Heritability estimate for AFC was 0.34 which was greater than the corresponding values for productive traits. The heritability estimates were low to medium for productive traits which ranged from 0.17 to 0.26 for cows in their first calvings. Except for fat and protein percentages of milk, phenotypic and genetic correlations between AFC and productive performance traits were low to moderately negative. Range of genetic correlations between productive traits was −0.53 to 0.99. Reduction of age at first calving appeared to have a negative effect on first lactation protein and fat percentages; however, it had positive effects on milk yield, fat yield, protein yield and their mature equivalents. It seems that reducing age at first calving to 24–25 months is probably more profitable than reducing age at first calving to an earlier time in Iranian conditions.
Starting Page	967
Ending Page	973
Page Count	7
File Format	PDF
ISSN	00494747
Journal	Tropical Animal Health and Production
Volume Number	43
Issue Number	5
e-ISSN	15737438
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-02-14
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Age at first calving Milk yield Genetic trend Dairy cow Veterinary Medicine Zoology
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Food Animals

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