Economic values were derived for the Japanese Black (Wagyu) breed using a bio-economic model that simulates commercial integrated cow-calf-fattening systems in Japan. The breeding objective was profit maximization of life-cycle production of a cow and the investigated traits were carcass weight (CWT), beef marbling score (BMS), birth weight (BWT), 9-month weight (WT9), cow mature weight (MWT) and calving interval (CI; interval between first and second calving). The relative economic values (relative emphasis; %) for BMS, CWT, BWT, MWT, WT9 and CI were 257729 (24.4), 65783 (6.0), -1828 (0.2), -51464 (4.7), 46806 (4.3) and -676400 (61.5), respectively. CI was thus found to be the most important trait economically, even though this trait has low heritablity. Among production traits, BMS was still the most important in Japan. The extremely high economic values of CI in the present study relative to the previous studies may be reflected by the effect that extra days in CI implicitly lead to a reduction in reproductive performance (conception rate) and thereby in the number of calves born. It was therefore suggested that CI should be included in the breeding objectives of future Wagyu breeding schemes because of its high economic importance.

Hiroyuki Hirooka

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Electronic Poster Session - Genetic gain - Breeding Objectives and Economics of Selection Schemes 1, , 1019, 2018
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