caa a22 4500 388059834 CHVBK 20180307125117.0 cr unu---uuuuu 161130e199806 xx s 000 0 eng 10.1017/S135772980000919X doi S135772980000919X pii (NATIONALLICENCE)cambridge-10.1017/S135772980000919X Developing breeding objectives for beef cattle production 2. Biological and economic values of growth and carcass traits in Japan [Elektronische Daten] 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. Copyright © British Society of Animal Science 1998 beef production nationallicence breeding objectives nationallicence carcass composition nationallicence efficiency nationallicence growth nationallicence Hirooka H. Faculty of Economics, Ryukoku University, 612-8577 Kyoto, Japan Groen A. F. Department of Animal Breeding, Wageningen Institute of Animal Sciences, PO Box 338, 6700 AH Wageningen, The Netherlands Hillers J. Department of Animal Sciences, Washington State University, Pullman 99164, USA Animal Science Cambridge University Press 66/3(1998-06), 623-633 1357-7298 66:3<623 1998 66 ASC https://doi.org/10.1017/S135772980000919X text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S135772980000919X text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hirooka H. Faculty of Economics, Ryukoku University, 612-8577 Kyoto, Japan NATIONALLICENCE 700 1- Groen A. F. Department of Animal Breeding, Wageningen Institute of Animal Sciences, PO Box 338, 6700 AH Wageningen, The Netherlands NATIONALLICENCE 700 1- Hillers J. Department of Animal Sciences, Washington State University, Pullman 99164, USA NATIONALLICENCE 773 0- Animal Science Cambridge University Press 66/3(1998-06), 623-633 1357-7298 66:3<623 1998 66 ASC CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge