黒毛和種若雌牛における半姉妹相関法による外貌記載形質の遺伝性

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Heritabilities and phenotypic and genetic correlations of 28 descriptive type traits and final score were estimated. The data of 1338 heifers which were 23.6 months old in average, descended from 89 sires and raised in five different prefectures were recorded by the Wagyu Registry Association of Japan. Paternal half-sib correlations were used to obtain the geneticparameters. Variance components were estimated using a least square analysis by HARVEY and covariance components were estimated using the modified HARVEY'S method. Estimates of the heritability of "ordinary hair" and "skin" which were important for quality evaluation, and dairy characters were relatively high; 0.25-0.34, while those of "feet" and "hoof" were low; 0.04 and 0.12, respectively. The heritabilities of beef characters ranging from 0.00 to 0.25 were nearly equal to or lower than that of final score of 0.19. The phenotypic correlations between descriptive traits and final score indicate that body capacity and stature, impressiveness, fore quarter, middle quarter and hind quarter characters are regarded to be more important at judging than quality, dairy and feet and hoof characters. Final score was highly correlated genetically with body capacity and stature, impressiveness, and hind quarter characters showing figures higher than 0.50, followed closely by fore quarter. However, the genetic correlations between final score and quality and dairy characters were intermediate or low (-0.15-0.41). Most of genetic correlations among descriptive characters with the exception of quality characters were sizable and positive. "Ordinary hair" and "skin" in quality characters positively and highly correlated genetically with impressiveness, dairy and feet and hoof characters, but did not with body capacity and stature, fore quarter, middle quarter and hind quarter characters. It is generally favorable that any genetic correlations among traits were not seriously negative. However, the genetic correlations between quality characters and final score, and between quality characters and body capacity and stature, fore quarter, middle quarter and hind quarter characters were relatively low. These facts should be taken into consideration in judging to improve Japanese Beef Cattle for qualitative and quantitative excellence.
社団法人日本畜産学会の論文

黒毛和種若雌牛における半姉妹相関法による外貌記載形質の遺伝性

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