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Basic studies on development of excellent strains in japanese beef cattle vii. factors affecting body weight and body measurements of japanese brown heifer at twelve months of age and relationship among those body sizes



Basic studies on development of excellent strains in japanese beef cattle vii. factors affecting body weight and body measurements of japanese brown heifer at twelve months of age and relationship among those body sizes



Proceedings of School of Agriculture Kyushu Tokai University 6: 47-56



Body weight and eleven body measurements of Japanese Brown heifers at twelve months of age were analyzed to estimate heritabilities and to clear the relationships of body weight and body measurements. The data for the variance analysis were obtained from 313 heifers of the Aso Branch of Kumamoto National Livestock Breeding Station from 1963 through 1984. The effects of year, sire within year, age of dam and season at birth, which were analyzed by the Harvey's least-squares procedure, were significant with some exceptions. Least-squares constants of heifer from young cows of two-years of age were smallest for body weight and measurements respectively, while those of heifer born at summer were largest. Heritabilities estimated by paternal half-sib correlation method were 0.92 for body weight, 0.43 for withers height, 0.37 for hip height, 0.37 for body length, 0.65 for chest width, 0.54 for chest depth, 0.56 for rump length, 0.18 for hip width, 0.69 for thurl width, 0.34 for pin bone width, 0.56 for chest girth and 0.30 for shank circumference, respectively. The data for the analysis of simple and partial correlations and principal components were obtained from 81 heifers from 1980 through 1984. Body weight had highly significant simple correlationship to all the measurements of eleven parts of body. Simple correlation coefficients among the measurements of eleven parts of body were significant, respectively. There were highly significant partial correlations between body weight and body length, chest width, thurl width and chest girth, respectively. Although chest girth had a significant correlation with chest depth, it had a small correlation with chest width. Body length showed significant partial correlation with rump length and hip height, rump length correlated with withers height chest width and hip width. Chest width correlated negatively with thurl width, which showed a significant partial correlation with pin bone width but no partial correlation with hip width. Shank circumference correlated with chest girth and pin bone width. Results of principal components analysis showed that the first, second and third principal components accounted for about 81 percentage of total variation. The first principal component seemed to provide a measure of overall size because all coefficients were positive. The second and third principal components provided contrasts of different shapes. As combinations of three principal components coefficients are classified into four types by those sign of eigen vectors, body size and shape of a heifer may be imagined by four to five measurements of body.

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