ESTIMATING DAUGHTER YIELD DEVIATION AND VALIDATION OF GENETIC TREND FOR SOMATIC CELL SCORE IN HOLSTEIN CATTLE USING RANDOM REGRESSION TEST DAY MODEL

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KHANZADEH H.; GHAVI HOSSEIN ZADEH N.

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Paper Information

Journal: JOURNAL OF AGRICULTURAL SCIENCE AND TECHNOLOGY (JAST) Year:2016 | Volume:18 | Issue:6 Page(s): 1467-1474

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Title

ESTIMATING DAUGHTER YIELD DEVIATION AND VALIDATION OF GENETIC TREND FOR SOMATIC CELL SCORE IN HOLSTEIN CATTLE USING RANDOM REGRESSION TEST DAY MODEL

Author(s)

KHANZADEH H. | GHAVI HOSSEIN ZADEH N. | Issue Writer Certificate

Keywords

DAIRY COWQ3

ESTIMATED BREEDING VALUEQ3

GENETIC PROGRESSQ3

MASTITISQ3

VALIDATION OF GENETIC TRENDQ3

Abstract

The objective of this study was to estimate Daughter Yield Deviations (DYDs) of bulls and Yield Deviations (YDs) for cows using a random regression model and VALIDATION OF GENETIC TREND using estimated DYDs and Method II of Interbull for test-day records of Somatic Cell Score (SCS) in the first lactation of Iranian Holsteins. Data set included the 108995 test day records collected by the Animal Breeding Center of Iran from 2001 to 2010. Results of the present study indicated that variation in YDs of cows at different stages of lactation corresponds closely with their ESTIMATED BREEDING VALUEs (EBVs).Because YDs and DYDs are considered as an additional measure of an animal’s genetic merit, their correlation with EBVs is very important. The correlation between DYDs and EBVs of bulls for SCS was 0.88. High correlation estimates between DYDs and EBVs indicated that, in addition to EBV, the DYD can be an appropriate measure for dairy cattle breeding programs. The correlation increased with increase in the number of bull daughters and the average number of test-days of daughters. Estimated DYDs for each production year were used to validate the genetic trend obtained from the model which was used for genetic evaluation. Results indicated that genetic trend for SCS in the first lactation of Iranian Holsteins was slightly overestimated.

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APA: Copy

KHANZADEH, H., & GHAVI HOSSEIN ZADEH, N.. (2016). ESTIMATING DAUGHTER YIELD DEVIATION AND VALIDATION OF GENETIC TREND FOR SOMATIC CELL SCORE IN HOLSTEIN CATTLE USING RANDOM REGRESSION TEST DAY MODEL. JOURNAL OF AGRICULTURAL SCIENCE AND TECHNOLOGY (JAST), 18(6), 1467-1474. SID. https://sid.ir/paper/62887/en

Vancouver: Copy

KHANZADEH H., GHAVI HOSSEIN ZADEH N.. ESTIMATING DAUGHTER YIELD DEVIATION AND VALIDATION OF GENETIC TREND FOR SOMATIC CELL SCORE IN HOLSTEIN CATTLE USING RANDOM REGRESSION TEST DAY MODEL. JOURNAL OF AGRICULTURAL SCIENCE AND TECHNOLOGY (JAST)[Internet]. 2016;18(6):1467-1474. Available from: https://sid.ir/paper/62887/en

IEEE: Copy

H. KHANZADEH, and N. GHAVI HOSSEIN ZADEH, “ESTIMATING DAUGHTER YIELD DEVIATION AND VALIDATION OF GENETIC TREND FOR SOMATIC CELL SCORE IN HOLSTEIN CATTLE USING RANDOM REGRESSION TEST DAY MODEL,” JOURNAL OF AGRICULTURAL SCIENCE AND TECHNOLOGY (JAST), vol. 18, no. 6, pp. 1467–1474, 2016, [Online]. Available: https://sid.ir/paper/62887/en

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