Inbreeding depressions on carcass traits were estimated in beef cattle. The 4,099 records on fattened steers were obtained from the Hyogo Prefectural Record of Performance Program for the Japanese Black Cattle. Carcass records for marbling standard(BMS), carcass weight, rib- eye area, rib thickness and subcutaneous fat thickness were analyzed by best linear unbiased prediction method with animal model. Average inbreeding coefficients of steers and their dams were 9.86% and 7.57%, respectively. The regression coefficients of carcass weight and subcutaneous fat thickness on inbreeding percentage were -.22kg/% or .6% of one phenotypic standard deviation and -.06mm/% or .9%, respectively. On the other hand, the coefficient of BMS was positive though it was very small.

Y. Sasaki, K. Moriya, T. Dogo

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 19. Selection and quantitative genetics; growth; reproduction; lactation; fish; fiber; meat., , 489–492, 1994
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