ESTIMATION OF GENETIC AND PHENOTYPIC PARAMETERS FOR PRODUCTION AND REPRODUCTION TRAITS IN IRANIAN HOLSTEINS

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FARHANGFAR H.; NAEEMIPOUR Y.

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Journal: Journal of Water and Soil Science Year:2007 | Volume:11 | Issue:1 (B) Page(s): 431-440

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Title

ESTIMATION OF GENETIC AND PHENOTYPIC PARAMETERS FOR PRODUCTION AND REPRODUCTION TRAITS IN IRANIAN HOLSTEINS

Author(s)

FARHANGFAR H. | NAEEMIPOUR Y. | Issue Writer Certificate

Keywords

IRANIAN HOLSTEINQ3

PRODUCTION TRAITSQ3

REPRODUCTION TRAITSQ3

HERITABILITYQ4

Abstract

A total of 25,471 IRANIAN HOLSTEIN heifers distributed in 523 herds of 20 provinces were used to estimate HERITABILITY, genetic and phenotypic associations between a number of traits related to the production and reproduction performance.The Animal Breeding Centre of Iran collected the records studied in this research between 1991 and 2001. The traits associated with production were 305-day, 2x adjusted milk, fat yields and fat percentage and the traits associated with reproduction were age at first calving, number of services per conception, gestation period, calving interval as well as dry days as a separate trait. The HERITABILITY estimates were 0.31, 0.23, 0.31, 0.14, 0.03, 0.05, 0.10 and 0.01 for 305-day, 2x milk, fat yields, fat percentage, age at first calving, dry days, calving interval, gestation period and the number of services per conception, respectively. Milk yield was genetically correlated with age at the first calving (-0.14), dry days (-0.31), calving interval (0.54), gestation period (0.01) and the number of insemination per conception (0.38). Fat yield had negative genetic correlations with age at first calving (-0.16), dry days (-0.23) while it was positively correlated with calving interval (0.44), gestation period (0.11) and the number of insemination per conception (0.20). Age at the first calving, dry days and gestation period had a positive genetic correlation with fat percentage (0.03, 0.15 and 0.09 respectively) while calving interval and the number of insemination per conception were negatively correlated with fat percentage (-0.21 and -0.25 respectively).

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برآورد توارث پذیری صفات تولید شیر و جربی دوره های اول تا سوم شیردهی گاوهای هلشتاین ایران

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APA: Copy

FARHANGFAR, H., & NAEEMIPOUR, Y.. (2007). ESTIMATION OF GENETIC AND PHENOTYPIC PARAMETERS FOR PRODUCTION AND REPRODUCTION TRAITS IN IRANIAN HOLSTEINS. WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES), 11(1 (B)), 431-440. SID. https://sid.ir/paper/14891/en

Vancouver: Copy

FARHANGFAR H., NAEEMIPOUR Y.. ESTIMATION OF GENETIC AND PHENOTYPIC PARAMETERS FOR PRODUCTION AND REPRODUCTION TRAITS IN IRANIAN HOLSTEINS. WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES)[Internet]. 2007;11(1 (B)):431-440. Available from: https://sid.ir/paper/14891/en

IEEE: Copy

H. FARHANGFAR, and Y. NAEEMIPOUR, “ESTIMATION OF GENETIC AND PHENOTYPIC PARAMETERS FOR PRODUCTION AND REPRODUCTION TRAITS IN IRANIAN HOLSTEINS,” WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES), vol. 11, no. 1 (B), pp. 431–440, 2007, [Online]. Available: https://sid.ir/paper/14891/en

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