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KMID : 1025520110530020171
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Journal of Animal Science and Technology
2011 Volume.53 No. 2 p.171 ~ p.176
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Determination of Crude Protein Requirements for Maintenance of Prepubertal Hanwoo Heifers
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Nam In-Sik
Oh Young-Kyoon
Chang Sun-Sik
Kim Do-Hyung
Seol Yong-Joo
Kim Kyoung-Hoon
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Abstract
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Two trials at different body weights of Hanwoo heifers (average body weight of 143 and 257 kg, respectively) were conducted to determine crude protein requirements for maintenance (CPm). Six Hanwoo heifers in each trial were used in two 3 3 Latin square design with three diets containing three levels of CP, 14 days in each period. In trial 1, the diets were based on 2.8 kg fresh wt./day/heifer timothy hay (LCP) with supplements of either 250 g ground corn and 150 g corn gluten meal (MCP) or 500 g ground corn and 300 g corn gluten meal (HCP). In trial 2, the diets were based on 4.8 kg fresh wt./day/heifer timothy hay (LCP) with supplements of either 350 g ground corn and 250 g corn gluten meal (MCP) or 700 g ground corn and 500 g corn gluten meal (HCP). In trial 1, CP intakes were 236.6, 340.1, and 459.8 g/d for LCP, MCP, and HCP, respectively. Crude protein balances were 0.51, 1.87 and 3.20g//d for LCP, MCP, and HCP, respectively. In trial 2, CP intakes were 415.2, 606.9 and 793.0g/d for LCP, MCP and HCP, respectively. Crude protein balances were 0.67, 1.03, 2.99 g//d for LCP, MCP, and HCP, respectively. The maintenance requirements for CP from the regression equation between CP intake and CP balance were 4.58g//d (trial 1) and 5.02 g//d (trial 2) and lower than the value (5.56 g//d) adopted by Korean Feeding Standards for Hanwoo (2007).
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KEYWORD
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Hanwoo heifers, Crude protein requirements, Maintenance
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