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Genetic parameters and trends for calving interval in the first three lactations of Iranian Holsteins

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Abstract

Calving records from the Animal Breeding Center of Iran collected from January 1987 to December 2007 and comprising 292,875 calving events of Holsteins from 1,413 dairy herds were analyzed using univariate and bivariate linear animal models to estimate heritabilities and genetic correlations for calving intervals in the first three lactations of Holstein cows. Genetic trends were obtained by regressing yearly mean estimates of breeding values on calving year. Average calving intervals were from 406 to 414 days and decreased over the parities. Heritability estimates for calving intervals varied from 0.03 to 0.04 across the parities. Also, estimates of genetic correlations between calving intervals in different parities were high and ranged from 0.67 to 0.89. The average annual phenotypic trends obtained from fitting linear regression of annual mean calving intervals at parity 1 and 2 were significant (P < 0.01), but the phenotypic trend of calving interval at parity 3 was not significant over the years. On the other hand, there was an increasing genetic trend for calving interval at parity 1, and there were decreasing genetic trends for calving intervals at parity 2 and 3 over the years (P < 0.01). The low estimates of heritability obtained in this study imply that much of the improvement in calving interval traits could be attained by improvement of production environment rather than genetic selection.

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Authors and Affiliations

  1. Department of Animal Science, Faculty of Agriculture, University of Guilan, P.O. Box 41635-1314, Rasht, Iran

    Navid Ghavi Hossein-Zadeh

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  1. Navid Ghavi Hossein-Zadeh
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Correspondence to Navid Ghavi Hossein-Zadeh.

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Ghavi Hossein-Zadeh, N. Genetic parameters and trends for calving interval in the first three lactations of Iranian Holsteins. Trop Anim Health Prod 43, 1111–1115 (2011). https://doi.org/10.1007/s11250-011-9809-1

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