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
This study investigated genetic trends of some productive and reproductive traits in Holstein Friesian cows kept at five herds in of Turkey. A total number of records used were 6953 during the period from 1980 to 1997. Variance components for 305 day milk yield (305 dMY), Lactation Period (LP) and Calving Interval (CI) were estimated by the Restricted Maximum Likelihood Method, using an animal model. The model included individual, permanent environmental and errors as random effects, herd, month and year of calving and parity as fixed effects. Estimates of heritability were 0.26, 0.07 and 0.09, respectively. Estimated repeatability values were 0.49, 0.17 and 0.23 for 305 dMY, LP and CI, respectively. Means of predicted breeding values for cows, dams and sires according to calving year and the genetic correlations were presented. The estimated of genetic trends of 305 dMY, LP and CI were 44.85 kg/year, 1.3 d/year and -0.95 d/year, respectively.
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How to cite this article
Hulya Atil and Adel Salah Khattab, 2005. Estimation of Genetic Trends for Productive and Reproductive Traits of Holstein Friesian Cows in Turkey. Pakistan Journal of Biological Sciences, 8: 202-205.
DOI: 10.3923/pjbs.2005.202.205
URL: https://scialert.net/abstract/?doi=pjbs.2005.202.205
DOI: 10.3923/pjbs.2005.202.205
URL: https://scialert.net/abstract/?doi=pjbs.2005.202.205
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