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Basic studies on development of excellent strains in japanese beef cattle 4. sire evaluation for beef production traits of japanese brown cattle by best linear unbiased prediction method



Basic studies on development of excellent strains in japanese beef cattle 4. sire evaluation for beef production traits of japanese brown cattle by best linear unbiased prediction method



Proceedings of School of Agriculture Kyushu Tokai University (4): 35-42



Sire breeding values expressed as the expected progeny differences (EPD) were estimated for average daily gain, final weight, dressing percentage, ribeye area and marbling score from data collected on 924 steer progenies from 20 sires of Japanese Brown Breed which were progeny-tested on farms in Kumamoto Prefecture from 1975 to 1978. Prior to analysis, the data were adjusted for age of steers at marketing using correction factors. Henderson's best linear unbiased prediction method involving an inverse of numerator relationship matrix among sires was used for sire evaluation. The ratios of error to sire variance components were obtained from sire and error components of variances which were calculated to estimate heritabilities of growth and carcass traits in an earlier study by Kumazaki and Shibata (1983). Sires were classified into four sire-line groups according to a set of sires from the same stud, and sire breeding values for the jth sire in the ith sire-line groups were estimated from G.cxa.i + S.cxa.ij. The sires ranked top-class by their breeding values for each trait were Daini Shigekawa, Mitsutake and Kyusen. However, the low rank correlations between each pair of EPD for these traits, except for average daily gain to final weight suggest that sire evaluation for multiple traits and for economic merit should be more appropriate for selection of beef sires, compared with independent sire evaluation for each trait.

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