ESTIMATION OF GENETIC PARAMETERS FOR MILK AND FAT YIELD TRAITS OF HOLSTEIN DAIRY CATTLE USING TEST DAY RECORDS

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MOGHADAS ZADEH AHRABI S.; ESKANDARINASAB M.P.; ALIJANI S.; ABBASI M.A.

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Paper Information

Journal: Journal of Agricultural Sciences and Natural Resources Year:2005 | Volume:12 | Issue:SUPPLEMENT (SPECIAL ISSUE ANIMAL SCIENCE) Page(s): 7-16

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Title

ESTIMATION OF GENETIC PARAMETERS FOR MILK AND FAT YIELD TRAITS OF HOLSTEIN DAIRY CATTLE USING TEST DAY RECORDS

Author(s)

MOGHADAS ZADEH AHRABI S. | ESKANDARINASAB M.P. | ALIJANI S. | ABBASI M.A. | Issue Writer Certificate

Keywords

RANDOM REGRESSION MODELQ4

COVARIANCE FUNCTIONSQ4

MILK AND FAT YIELDQ4

HOLESTEINSQ3

Abstract

Test dat MILK AND FAT YIELD records from first calving Holsteins were analyzed using single trait random regression test day model (RR/CF model) and restricted maximum likelihood method. Fixed random regressions (additive genetic and permanent environmental) were modeled with orthogonal legendre polynomials on days in milk. Residual variance components during lactation were estimated using 3th order variance function. According to the results, for milk yield trait a RANDOM REGRESSION MODEL with 3 and 4 orders of fit for additive genetic and permanent environmental COVARIANCE FUNCTIONS, respectively and for fat yield trait 3 order of fit for both COVARIANCE FUNCTIONS are suitable. Phenotypic variance during lactation was not constant and was higher at the beginning and the end of lactation. Maximum residual variance for MILK AND FAT YIELD traits was estimated in early lactation. Minimum and maximum additive genetoc variance for both traits was estimated at the beginning and 8th month of lactation, respectively. Estimates of heritability were found to be lowest during early lactation. This parameter increased to mid lactation and maximized nearly in the 8thmonth of lactation (0.28 for milk yield and 0.22 for fat yield). Additive genetic and permanent environmental correlations between adjacent test days were more than between distant test days.

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APA: Copy

MOGHADAS ZADEH AHRABI, S., ESKANDARINASAB, M.P., ALIJANI, S., & ABBASI, M.A.. (2005). ESTIMATION OF GENETIC PARAMETERS FOR MILK AND FAT YIELD TRAITS OF HOLSTEIN DAIRY CATTLE USING TEST DAY RECORDS. JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES, 12(SUPPLEMENT (SPECIAL ISSUE ANIMAL SCIENCE)), 7-16. SID. https://sid.ir/paper/9440/en

Vancouver: Copy

MOGHADAS ZADEH AHRABI S., ESKANDARINASAB M.P., ALIJANI S., ABBASI M.A.. ESTIMATION OF GENETIC PARAMETERS FOR MILK AND FAT YIELD TRAITS OF HOLSTEIN DAIRY CATTLE USING TEST DAY RECORDS. JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES[Internet]. 2005;12(SUPPLEMENT (SPECIAL ISSUE ANIMAL SCIENCE)):7-16. Available from: https://sid.ir/paper/9440/en

IEEE: Copy

S. MOGHADAS ZADEH AHRABI, M.P. ESKANDARINASAB, S. ALIJANI, and M.A. ABBASI, “ESTIMATION OF GENETIC PARAMETERS FOR MILK AND FAT YIELD TRAITS OF HOLSTEIN DAIRY CATTLE USING TEST DAY RECORDS,” JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES, vol. 12, no. SUPPLEMENT (SPECIAL ISSUE ANIMAL SCIENCE), pp. 7–16, 2005, [Online]. Available: https://sid.ir/paper/9440/en

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