ESTIMATION OF GENETIC TRENDS FOR PRODUCTION TRAITS OF HOLSTEIN CATTLE IN MARKAZI PROVINCE

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RAZAVI S.M.; VATANKHAH M.; MIRZAEI HAMID REZA; ROKOUEI M.

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Journal: Year:2008 | Volume:20 | Issue:4 (77 IN ANIMAL AND FISHERIES SCIENCES) Page(s): 55-62

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Title

ESTIMATION OF GENETIC TRENDS FOR PRODUCTION TRAITS OF HOLSTEIN CATTLE IN MARKAZI PROVINCE

Author(s)

RAZAVI S.M. | VATANKHAH M. | MIRZAEI HAMID REZA | ROKOUEI M. | Issue Writer Certificate

Keywords

GENETIC PARAMETERSQ3

GENETIC TRENDQ3

HOLSTEIN CATTLEQ3

MILK PRODUCTIONQ3

Abstract

In this research the Markazi province HOLSTEIN CATTLE data set was used. The data set included all lactation records of 31 herds with 15539 records, which collected during 1990- 2004 by the Iranian Animal Breeding Center. Variance components were estimated for milk, fat yields and fat percentage, using an animal model in Restricted Maximum Likelihood method based on a Derivative-Free algorithm. The model was contained of herd-year-season of calving and parity as fixed effects, and additive genetic effects, permanent environmental effects due to repeated records and residuals as random effect. Best linear unbiased prediction (BLUP) of breeding values of traits were obtained and phenotypic, genetic and environmental trends were calculated as the regression of average phenotypic values, predicted breeding values and environmental values on year of cow birth respectively. Heritability of milk yield, fat and fat percent were found to be 0.20, 0.23 and 0.32 respectively. Repeatability of milk yield, fat and fat percent was estimated as 0.46, 0.39 and 0.40 respectively. Phenotypic trends of traits were 22.29 kg/year for milk, 0.23 kg/year for fat and 0.05 percent/year for fat percent, GENETIC TRENDs for these traits were 3.75 kg/year, 0.06 kg/year and -0.02 percent/year and environmental trend for traits were 19.79 kg/year, 0.23 kg/year and 0.07 percent/year, respectively.

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APA: Copy

RAZAVI, S.M., VATANKHAH, M., MIRZAEI, HAMID REZA, & ROKOUEI, M.. (2008). ESTIMATION OF GENETIC TRENDS FOR PRODUCTION TRAITS OF HOLSTEIN CATTLE IN MARKAZI PROVINCE. PAJOUHESH-VA-SAZANDEGI, 20(4 (77 IN ANIMAL AND FISHERIES SCIENCES)), 55-62. SID. https://sid.ir/paper/20152/en

Vancouver: Copy

RAZAVI S.M., VATANKHAH M., MIRZAEI HAMID REZA, ROKOUEI M.. ESTIMATION OF GENETIC TRENDS FOR PRODUCTION TRAITS OF HOLSTEIN CATTLE IN MARKAZI PROVINCE. PAJOUHESH-VA-SAZANDEGI[Internet]. 2008;20(4 (77 IN ANIMAL AND FISHERIES SCIENCES)):55-62. Available from: https://sid.ir/paper/20152/en

IEEE: Copy

S.M. RAZAVI, M. VATANKHAH, HAMID REZA MIRZAEI, and M. ROKOUEI, “ESTIMATION OF GENETIC TRENDS FOR PRODUCTION TRAITS OF HOLSTEIN CATTLE IN MARKAZI PROVINCE,” PAJOUHESH-VA-SAZANDEGI, vol. 20, no. 4 (77 IN ANIMAL AND FISHERIES SCIENCES), pp. 55–62, 2008, [Online]. Available: https://sid.ir/paper/20152/en

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