GENETIC EVALUATION OF MILK PRODUCTION IN HOLSTEIN DAIRY CATTLE OF KHORASAN PROVINCE USING A SPLINE RANDOM REGRESSION MODEL

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FARHANGFAR H.; NAEIMIPOUR H.; LOTFI REZA

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Paper Information

Journal: Journal of Water and Soil Science Year:2008 | Volume:12 | Issue:43 (SPECIAL ISSUE IN SCIENCES AND TECHNOLOGY OF FOOD AND ANIMAL) Page(s): 533-543

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Title

GENETIC EVALUATION OF MILK PRODUCTION IN HOLSTEIN DAIRY CATTLE OF KHORASAN PROVINCE USING A SPLINE RANDOM REGRESSION MODEL

Author(s)

FARHANGFAR H. | NAEIMIPOUR H. | LOTFI REZA | Issue Writer Certificate

Keywords

GENETIC EVALUATIONQ3

HOLSTEIN COWQ3

CUBIC SPLINE RANDOM REGRESSIONQ3

Abstract

This study was undertaken to estimate genetic trend and parameters of Holstein cattle in Khorasan province for milk yield using a spline random regression test day animal model. A total of 32854 monthly test day milk records (twice and thrice a day milking) obtained from 3842 Holstein heifers (progeny of 466 sires) distributed in 125 herds and calved from 2001 to 2005 was used to predict breeding value of individual animals. In the model, fixed effects of herd including year-month of recording, milking times, age at calving (linear and quadratic covariables), Holstein gene percentage (linear covariable) as well as random effects of additive genetic and permanent environment were studied. To take account of the shape of the lactation curve at genetic and environmental levels, cubic spline polynomials were also included in the test day model. Bayesian method by applying Gibbs sampling technique (100000 chains applying RRGIBBS software) was utilized to obtain posterior means of predicted breeding value of animals for milk yield at individual month of lactation. The results showed that mean of breeding value for 305-day milk yield was 52.90 kg (p<0.05). Spearman rank correlations between predicted breeding values at different months of lactation decreased as the interval between them increased. The highest and lowest rank correlations were found between months 8 and 9 (0.998) and between months 1 and 10 (0.312), respectively. Predicted breeding value of 305-day milk had the lowest and highest rank correlations with predicted breeding value at months 1 (0.553) and 6 (0.990), respectively. Regression analysis of average predicted breeding value of progenies in their birth year showed that the amount of genetic trend for 305 day milk yield was 17.75 kg per year, statistically no different from zero (p value=0.165).

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References

PERSISTENCY IN DAIRY CATTLE

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APA: Copy

FARHANGFAR, H., NAEIMIPOUR, H., & LOTFI, REZA. (2008). GENETIC EVALUATION OF MILK PRODUCTION IN HOLSTEIN DAIRY CATTLE OF KHORASAN PROVINCE USING A SPLINE RANDOM REGRESSION MODEL. WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES), 12(43 (SPECIAL ISSUE IN SCIENCES AND TECHNOLOGY OF FOOD AND ANIMAL)), 533-543. SID. https://sid.ir/paper/15118/en

Vancouver: Copy

FARHANGFAR H., NAEIMIPOUR H., LOTFI REZA. GENETIC EVALUATION OF MILK PRODUCTION IN HOLSTEIN DAIRY CATTLE OF KHORASAN PROVINCE USING A SPLINE RANDOM REGRESSION MODEL. WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES)[Internet]. 2008;12(43 (SPECIAL ISSUE IN SCIENCES AND TECHNOLOGY OF FOOD AND ANIMAL)):533-543. Available from: https://sid.ir/paper/15118/en

IEEE: Copy

H. FARHANGFAR, H. NAEIMIPOUR, and REZA LOTFI, “GENETIC EVALUATION OF MILK PRODUCTION IN HOLSTEIN DAIRY CATTLE OF KHORASAN PROVINCE USING A SPLINE RANDOM REGRESSION MODEL,” WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES), vol. 12, no. 43 (SPECIAL ISSUE IN SCIENCES AND TECHNOLOGY OF FOOD AND ANIMAL), pp. 533–543, 2008, [Online]. Available: https://sid.ir/paper/15118/en

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