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Article

Estimation of variance components and genetic trends for twinning rate in Holstein dairy cattle of Iran.

Journal of dairy science - 1 Jul 2009

Ghavi Hossein-Zadeh N, Nejati-Javaremi A, Miraei-Ashtiani S R, Kohram H

Abstract excerpt

Calving records from the Animal Breeding Center of Iran, collected from January 1991 to December 2007 and comprising 1,163,594 Holstein calving events from 2,552 herds, were analyzed using a linear animal model, linear sire model, threshold animal model, and threshold sire model to estimate variance components, heritabilities, genetic correlations, and genetic trends for twinning rate in the first, second, and...

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PMID: 19528619
DOI: 10.3168/jds.2008-1631

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