Method R Estimates of Heritability and Repeatability for Milk, Fat and Protein Yields of Japanese Holstein

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概要

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• Heritabilities and repeatabilities for milk production traits were estimated by Method R. Data consisted of records of Holstein cows that were used for the national genetic evaluation of 1999 in Japan. The whole data and 10 subsets of the same data were used for heritability (h2) estimation. Heritabilities estimated from the 10 subsets were on average 0.34, 0.32 and 0.30 for milk, fat and protein yields, respectively. These heritabilities were higher by 0.01 than those estimated from the whole data. Repeatability estimates were 0.53, 0.52 and 0.51 for milk, fat and protein yields, respectively. When the analyses were performed by parity, the results were different among parities. Estimates of h2 in the first lactation were 0.40, 0.37 and 0.32 for milk, fat and protein, respectively and decreased in the following lactations. A considerable difference between the first and the remaining lactations might cause a loss of accuracy in the estimation of h2 when a repeatability model is used. Under these circumstances a better approach would be to treat the lactations as different traits. But, actually Method R does not support multiple trait estimation. Therefore, if the differences in h2 among lactations are going to be taken into account in national genetic evaluations, further research is necessary to develop an appropriate procedure in order to estimate heritabilities using all the data available for national genetic evaluations.

• 社団法人 日本畜産学会の論文

著者

• PEREIRA Juan

  Faculty of Agriculture, Iwate University

• YOSHIZAWA Tsutomu

  National Livestock Breeding Center

• TSURUTA Shogo

  Animal and Dairy Science Department, University of Georgia

• Hagiya Kouichi

  Faculty Of Agriculture Iwate University

• Misztal Ignacy

  Animal & Dairy Science Department University Of Georgia

• Suzuki Mitsuyoshi

  Obihiro University Of Agriculture & Veterinary Medicine

関連論文

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