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KMID : 1025520060480040533
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Journal of Animal Science and Technology
2006 Volume.48 No. 4 p.533 ~ p.540
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Crude Protein Requirements for Maintenance of Hanwoo Steers by Protein Balance Trial
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Kim Kyoung-Hoon
Oh Young-Kyoon
Lee Sang-Chul
Shin K. J.
Kang Su-Won
Moon Yea-Hwang
Song Man-Kang
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Abstract
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This experiment was conducted to determine crude protein requirements for maintenance (CPm) of growing Hanwoo steers. Eighteen Hanwoo steers (173.7kg) were allocated randomly to diets with three levels of crude protein in the concentrate by replacing ground corn with corn gluten meal: 0% (LCP), 7.2% (MCP) and 14.2% (HCP), respectively. Hanwoo steers in each treatment were fed diets containing rice straw (20%) and concentrates (80%). CP intake was 5.5, 7.8 and 10.7g/BW0.75 for LCP, MCP and HCP, respectively. Protein balance was －0.05, 2.36 and 4.07g/BW0.75 for LCP, MCP and HCP, respectively. Intercept of the regression equation between CP intake and retained CP indicated that CPm was 5.56g/BW0.75. The estimate of CPm adopted by Korean Feeding Standard (2002) was almost 20% higher than that adopted by Japanese Feeding Standard for Beef Cattle (2000); this would need to be verified with more feeding trial data set including protein requirements for growth.
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KEYWORD
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Crude protein requirements, Hanwoo steers, Maintenance, Protein balance, Standard feeding
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