Hulya Atil
Faculty of Agriculture, Ege University, Turkey,
M. Nagib El Ariain
Faculty of Agriculture, Mansoura University, Egypt
A. Salah Khattab
Faculty of Agriculture, Tanta University, Egypt
ABSTRACT
673 records of Friesian heifers produced by 166 sires kept at a commercial farm were used and the traits yield 90 days milk yield, 305 days milk yield and annual milk yield were examined. Least squares analysis of variance showed that the effect of sire as a random effect, year and season of calving subclasses as a fixed effects and age at first calving (AFC)as a covariate on most of different traits were significant. Curvilinear of yield traits on age at first calving were obtained. A set of multiplicative age correction factors of different traits were derived by fitting a polynomial of second degree of production on age. Age correction factors had similar trend and they did not exhibit large differences between consecutive ages at older ages but relatively large differences between consecutive ages at younger ages, differences in age correction factors were consistently present across 305 days milk yield and each of 90 days milk yield and annual milk yield and consequently factors used for adjusted 305 day milk yield could be applied to different yield traits without substantial loss in accuracy.
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How to cite this article
Hulya Atil, M. Nagib El Ariain and A. Salah Khattab, 2001. Age Correction Factors for Some Productive Traits in a Commercial
Herd of Holstein Friesian Cattle in Egypt. Journal of Biological Sciences, 1: 663-665.
DOI: 10.3923/jbs.2001.663.665
URL: https://scialert.net/abstract/?doi=jbs.2001.663.665
DOI: 10.3923/jbs.2001.663.665
URL: https://scialert.net/abstract/?doi=jbs.2001.663.665
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