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Title: Effects of sex control and twinning on economic optimization of culling cows in Japanese Black cow-calf production systems.
Authors: Oishi, K  kyouindb  KAKEN_id  orcid (unconfirmed)
Hirooka, H  kyouindb  KAKEN_id  orcid (unconfirmed)
Author's alias: 大石, 風人
Keywords: Beef cow-calf production
Annualized net revenue
Optimal culling parity
Sex control
Issue Date: 15-Jan-2012
Publisher: Elsevier Inc.
Journal title: Theriogenology
Volume: 77
Issue: 2
Start page: 320
End page: 330
Abstract: The effects of sex control and twinning techniques on determination of optimal culling parity of cows in beef cow-calf production systems were deterministically analyzed using a herd model simulation. The model simulated the annualized net revenue as an economic indicator during the whole life cycle of a cow. 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. Some biological and economic parameters relating to these factors were altered from a base condition in order to adapt the production systems with sex control and twinning techniques. Based on the model, early culling was optimal for all production systems when biological efficiency was used as an indicator of production; however, later culling was optimal for single production, but slightly earlier culling was optimal for twin production, when annualized net revenue was evaluated. The introduction of sex control did not greatly affect the determination of the optimal culling parity of cows. When production included the sex control, female sexing increased biological efficiency, whereas male sexing increased annualized net revenue. In the present beef cow-calf production circumstances in Japan, introduction of sex control did not have economically appreciable effects, but twinning was economically beneficial. For production involving sex control, improvement in the conception rate per mating and/or reduction of technical cost were required for this technology to be profitable.
Rights: © 2012 Elsevier Inc.
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。
DOI(Published Version): 10.1016/j.theriogenology.2011.08.003
PubMed ID: 21958630
Appears in Collections:Journal Articles

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