ESTIMATION OF GENETIC, PHENOTYPIC AND ENVIRONMENTAL PARAMETERS OF MILK PRODUCTION TRAITS IN HOLSTEIN DAIRY CATTLE OF MOGHAN CO. FARM

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SHOJA GHIAS JALIL; PIRANI N.A.; ALIJANI S.; AHMADY A.

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Journal: JOURNAL OF AGRICULTURAL KNOWLEDGE Year:2003 | Volume:12 | Issue:4 Page(s): 13-22

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Title

ESTIMATION OF GENETIC, PHENOTYPIC AND ENVIRONMENTAL PARAMETERS OF MILK PRODUCTION TRAITS IN HOLSTEIN DAIRY CATTLE OF MOGHAN CO. FARM

Author(s)

SHOJA GHIAS JALIL | PIRANI N.A. | ALIJANI S. | AHMADY A. | Issue Writer Certificate

Keywords

FAT GENETIC TRENDQ3

GENETIC PARAMETERSQ3

HOLSTEINQ3

MILKQ3

MOGHANQ3

Abstract

The genetic changes in HOLSTEIN dairy cattle of MOGHAN Co. farm iscure estimated and MILK records during years 1987-1988 and fat records from 1992 to 1998 were collected for statistical analysis and estimation of (co) variance components and GENETIC PARAMETERS. Three models including single- trait, two-traits (first lactation records) and repeatability (first three lactation records) were applied, using DFREML software. Estimated heritability of MILK and fat yield traits with three models were 0.254, 0.255; 0.245, 0.25; 0.234 and 0.204, respectively. Repeatability of these traits were estimated as 0.501 and 0.361, respectively. To calculate the genetic trend of production traits, regression of mean predicted breeding value on year of calving in cows and first calving of daughter in sires were used. To estimate phenotypic trend, regression of mean phenotypic records on first calving of cows was determined. Genetic trend of sires for MILK production during 1990-1998 years and for fat yield during 1992-1998 years were 2.22 and -0.179 kg per years, respectively. Dam’s genetic and phenotypic trend for MILK production during 1987-1998 years and for fat yield during 1992-1998 years were 13.26 and 44.23; -0.0003 and 2.23 kg per year, respectively.

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APA: Copy

SHOJA GHIAS, JALIL, PIRANI, N.A., ALIJANI, S., & AHMADY, A.. (2003). ESTIMATION OF GENETIC, PHENOTYPIC AND ENVIRONMENTAL PARAMETERS OF MILK PRODUCTION TRAITS IN HOLSTEIN DAIRY CATTLE OF MOGHAN CO. FARM. JOURNAL OF AGRICULTURAL KNOWLEDGE, 12(4), 13-22. SID. https://sid.ir/paper/28712/en

Vancouver: Copy

SHOJA GHIAS JALIL, PIRANI N.A., ALIJANI S., AHMADY A.. ESTIMATION OF GENETIC, PHENOTYPIC AND ENVIRONMENTAL PARAMETERS OF MILK PRODUCTION TRAITS IN HOLSTEIN DAIRY CATTLE OF MOGHAN CO. FARM. JOURNAL OF AGRICULTURAL KNOWLEDGE[Internet]. 2003;12(4):13-22. Available from: https://sid.ir/paper/28712/en

IEEE: Copy

JALIL SHOJA GHIAS, N.A. PIRANI, S. ALIJANI, and A. AHMADY, “ESTIMATION OF GENETIC, PHENOTYPIC AND ENVIRONMENTAL PARAMETERS OF MILK PRODUCTION TRAITS IN HOLSTEIN DAIRY CATTLE OF MOGHAN CO. FARM,” JOURNAL OF AGRICULTURAL KNOWLEDGE, vol. 12, no. 4, pp. 13–22, 2003, [Online]. Available: https://sid.ir/paper/28712/en

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