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Developing breeding objectives for beef cattle production 2. Biological and economic values of growth and carcass traits in Japan

Published online by Cambridge University Press:  02 September 2010

H. Hirooka ,
A. F. Groen  and
J. Hillers
H. Hirooka
Affiliation:
Faculty of Economics, Ryukoku University, 612–8577 Kyoto, Japan
A. F. Groen
Affiliation:
Department of Animal Breeding, Wageningen Institute of Animal Sciences, PO Box 338, 6700 AH Wageningen, The Netherlands
J. Hillers
Affiliation:
Department of Animal Sciences, Washington State University, Pullman 99164, USA
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Abstract

A deterministic bio-economic model simulating beef production during the life cycle of a cow and her offspring was used to estimate biological and economic values of daily gain, marbling score, birth weight, weaning weight and mature weight for three production systems (cow-calf, feedlot and integrated) and alternative production circumstances in Japan. Biological efficiency (live-weight basis and lean-weight basis) and economic efficiency (returns over costs) were regarded as breeding objectives. Alternatives included reducing the maximum number of reproductive cycles, marketing by constant slaughter weight (BASE), constant age or constant carcass fat content, lighter slaughter weight and doubling food prices. Biological efficiency on a live-weight basis for the cow-calf system was most influenced by increasing weaning weight; for the feedlot and integrated system, increasing daily gain had the largest influence. For biological efficiency of lean production, increasing daily gain and mature weight had the largest influence in the feedlot and integrated systems, respectively. For economic efficiency, increasing weaning weight was most beneficial in the cow-calf system and increasing marbling score was most beneficial in the feedlot and integrated systems. Economic values of daily gain and weaning weight decreased markedly with increasing genetic levels of these traits. Marketing by age decreased the biological values of daily gain but increased the economic value of daily gain. Marketing at a constant carcass fat content decreased biological values of mature weight but increased the economic value of mature weight. Decreasing slaughter weight provided negative economic values of daily gain and weaning weight. Economic values were reduced when food prices were doubled.

Keywords

beef productionbreeding objectivescarcass compositionefficiencygrowth
Type
Research Article
Information
Animal Science , Volume 66 , Issue 3 , June 1998 , pp. 623 - 633
Copyright
Copyright © British Society of Animal Science 1998

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