Hulya Atil
Department of Animal Science, Faculty of Agriculture, Ege University, Turkey
Adel Salah Khattab
Department of Animal Production, Faculty of Agriculture, Tanta University, Egypt
ABSTRACT
A total of 1780 normal first lactation records of Holstein Friesian cows kept at five herds in West Turkey during the period from 1981 to 1997 were used in this study. Genetic and phenotypic parameters for 305 day milk yield (dMY) and Age at First Calving (AFC) were estimated by MTDFREML using multi trait animal model. The model included individual and error terms as random effects, herds, season and year of calving as fixed effects and the effect of AFC on 305 dMY as a covariate. Estimates of heritability were 0.20 and 0.75 for 305 dMY and AFC, respectively. The genetic correlation between 305 dMY and AFC was negative (-0.22). Predicted breeding values for cows, dams and sires were presented.
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How to cite this article
Hulya Atil and Adel Salah Khattab, 2005. Use of Multiple Traits Animal Model for Genetic Evaluation of Milk Yield and Age at First Calving of Holstein Friesian Cattle in Turkey. Pakistan Journal of Biological Sciences, 8: 114-117.
DOI: 10.3923/pjbs.2005.114.117
URL: https://scialert.net/abstract/?doi=pjbs.2005.114.117
DOI: 10.3923/pjbs.2005.114.117
URL: https://scialert.net/abstract/?doi=pjbs.2005.114.117
REFERENCES
- Khattab, A.S. and Z.A. Sultan, 1991. A comparison of different selection indices for genetic improvement of some dairy traits in Friesian cattle in Egypt. J. Anim. Breed. Genet., 108: 349-354.
CrossRefDirect Link - Atil, H., A.S. Khattab and Y. Gevrekci, 2003. A comparison of different selection indices for genetic improvement of some dairy milk traits in Holstein Friesian cows in Turkey. Proceedings of the 2nd International Biometric Society Conference of the Eastern Mediterranean Region, (IBSCEMR`03), Antalya, Turkey, pp: 65-65.