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Title: Economic and environmental impacts of changes in culling parity of cows and diet composition in Japanese beef cow–calf production systems
Authors: Oishi, Kazato  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-9311-7432 (unconfirmed)
Kato, Yohei
Ogino, Akifumi
Hirooka, Hiroyuki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-9169-2908 (unconfirmed)
Author's alias: 大石, 風人
Keywords: Beef cow–calf production
Optimal culling parity
Annualized net revenue
Environmental impact
Life cycle assessment
Modified feed formulation method
Issue Date: Feb-2013
Publisher: Elsevier Ltd.
Journal title: Agricultural Systems
Volume: 115
Start page: 95
End page: 103
Abstract: The effects of changes in culling parity of cows and diet composition on economic and environmental outputs in Japanese beef cow–calf production systems were deterministically analyzed using a herd model simulation. The model simulated the annualized net revenue as an economic indicator and the overall environmental index derived from a life cycle assessment (LCA) as an environmental indicator. Biological factors (survivability, growth, reproduction, and feed requirements) and economic factors (returns from sales of live calves and cows’ carcasses and production costs) were included in the model. The model also included modified feed formulation methods, allowing us to analyze the effect of reductions in environmental loads caused by the change in diet compositions. The results of the present study indicated that later culling was economically and environmentally optimal under the current production system, which suggested that the selection of economically optimal culling parity of cows could result in environmentally optimization of the beef cow–calf production system. The difference in feed composition derived from the difference in feed formulation methods did not affect the determination of optimal culling parity, whereas the use of modified feed formulation methods could reduce environmental loads at a higher rate than that of economic benefits. However, the reduction rate of the environmental impact was much higher in the case of selection of the optimal culling parity than in the case of use of modified feed formulation methods, which stressed the importance of choosing the optimal culling parity of cows both from the economic and environmental points of view.
Rights: © 2012 Elsevier Ltd.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/168980
DOI(Published Version): 10.1016/j.agsy.2012.09.007
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