Genetic Parameters and Trends of Carcass Traits of Japanese Brown Cattle

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  • SHIRAI Tatsuo
    National Livestock Breeding Center Research Council, Ministry of Agriculture, Forestry and Fisheries
  • NAGAMINE Yoshitaka
    Tohoku National Agricultural Experiment Station National Institute of Agrobiological Resources, Ministry of Agriculture, Forestry and Fisheries
  • ATAGI Yamato
    National Livestock Breeding Center
  • NAGANO Mamiko
    National Livestock Breeding Center
  • IKEUCHI Yutaka
    National Livestock Breeding Center

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Other Title
  • 褐毛和種の枝肉形質における遺伝的パラメーターとその遺伝的趨勢の推定
  • カツモウワシュ ノ エダニク ケイシツ ニ オケル イデンテキ パラメーター

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Abstract

Data of Japanese Brown cattle were collected from Kumamoto, Nagasaki and Akita prefectures of December, 1993. A total of 10, 471 carcass data were used to estimate breeding values and genetic parameters for daily carcass weight gain (carcass weight/slaughter age), rib eye area, subcutaneous fat thickness, yield estimate, marbling score, beef colorscore, firmness and texture. Breeding values were estimated by BLUP under an animal model and genetic parameters were estimated by Henderson's method III. The statistical model involved year•location (agricultural corporative), sex, individual animal, the slaughter, thelinear and quadratic regression of the slaughter months of age. Heritability estimates for carcass traits were as follows; daily carcass weight gain, rib eye area, subcutaneous fat thickness, yield estimate, marbling score, beef color score, firmness and texture 0.225, 0.313, 0.297, 0.397, 0.271, 0.218, 0.247 and 0.195, respectively. The regression coefficients of standardized estimated breeding valuesof female cattle, that were born from 1975 to 1989, on the traits on the birth year were calculated to examine the genetic trends of femalepopulation. The regression coefficients of the daily carcass weight gain, rib eye area, marbling score, beef color score, firmness and texture on the birth year were 0.665, 0.051, 0.030, -0.016, 0.015 and 0.011, respectively. All coefficients were statistically significant at 1% level. The regression coefficients of estimated breeding values of sire cattle on birth year group was also calculated. But none of the regression coefficients was statistically significicant. The sires with superior breeding values had more progeny than the others. It was suggested that genetic improvement of female population was caused by frequent usage of some superior sires.

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