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Information Journal Paper

Title

GENETIC ANALYSIS OF MILK PRODUCTION TRAIT USING TEST DAY MODEL WITH FIXED AND RANDOM REGRESSIONS IN HOLSTEIN DAIRY COWS OF YAZD PROVINCE

Pages

  13-30

Abstract

 This study was conducted to estimate genetic parameters of MILK PRODUCTION in Yazd Holstein dairy cows using fixed and random regression model. The dataset consisted of 35178 test day records belonging to 5101 first calving Holstein cows with two or three times of milking was used. Data were collected from 42 herds during 1991 to 2009. A combination of herd, year, season and times of milking were included in the models. Age at calving along with Holstein percertage of each cow were considened as covariates. Direct genetic and permanent enviromental effects were included in the models as random effects. Random direct genetic and permanent enviromental effects were fitted on MILK PRODUCTION curve using Legender orthogonal polynomial with power three for permanent enviroment effect and power four for direct genetic effect in random regression model. Estimated HERITABILITY for MILK PRODUCTION in fixed regression model was 0.17. In random regression model, HERITABILITY of MILK PRODUCTION was higher in second than first mid of lactaion period. The highest and the lowest HERITABILITY were estimated at first (0.088) and tenth (0.292) months, respectively. Estimated breeding values for sires and daughters were evaluated in both models. The mean of estimated breeding values in random regression model was significantly higher than fixed regression model. Rank correlations between breeding values of two models were 0.958 and 0.964 for sires and daughters, respectively. In conclusion, random regression model can be recommended for genetic parameter estimation, because of its higher accuracy compared to fixed regression model.

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    APA: Copy

    KHALEGHI, M.H., ZEREHDARAN, S., HASSANI, S., FARHANGFAR, H., & EGHBAL, A.R.. (2013). GENETIC ANALYSIS OF MILK PRODUCTION TRAIT USING TEST DAY MODEL WITH FIXED AND RANDOM REGRESSIONS IN HOLSTEIN DAIRY COWS OF YAZD PROVINCE. JOURNAL OF RUMINANT RESEARCH, 1(1), 13-30. SID. https://sid.ir/paper/243974/en

    Vancouver: Copy

    KHALEGHI M.H., ZEREHDARAN S., HASSANI S., FARHANGFAR H., EGHBAL A.R.. GENETIC ANALYSIS OF MILK PRODUCTION TRAIT USING TEST DAY MODEL WITH FIXED AND RANDOM REGRESSIONS IN HOLSTEIN DAIRY COWS OF YAZD PROVINCE. JOURNAL OF RUMINANT RESEARCH[Internet]. 2013;1(1):13-30. Available from: https://sid.ir/paper/243974/en

    IEEE: Copy

    M.H. KHALEGHI, S. ZEREHDARAN, S. HASSANI, H. FARHANGFAR, and A.R. EGHBAL, “GENETIC ANALYSIS OF MILK PRODUCTION TRAIT USING TEST DAY MODEL WITH FIXED AND RANDOM REGRESSIONS IN HOLSTEIN DAIRY COWS OF YAZD PROVINCE,” JOURNAL OF RUMINANT RESEARCH, vol. 1, no. 1, pp. 13–30, 2013, [Online]. Available: https://sid.ir/paper/243974/en

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