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- Ghavi Hossein-Zadeh, N.; Nejati-Javaremi, A.; Miraei-Ashtiani, S.R.; Kohram, H.
- Journal of dairy science 2009 v.92 no.7 pp. 3411-3421
- dairy cows; estimation; sires; linear models; parity (reproduction); genetic correlation; calving; Holstein; twins; genetic variance; heritability; animal age; genetic trend; prediction; Iran
- ... 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 ...