Determination of Crude Protein Requirements for Maintenance of Prepubertal Hanwoo Heifers
2011
Nam, I.S., Korea Livestock Products HACCP Accreditation Service, Anyang, Republic of Korea | Oh, Y.K., National Institute of Animal Science, RDA, Suwon, Republic of Korea | Jang, S.S., National Institute of Animal Science, RDA, Suwon, Republic of Korea | Kim, D.H., University of Kentucky, College of Agriculture, USA | Seol, Y.J., National Institute of Animal Science, RDA, Suwon, Republic of Korea | Kim, K.H., National Institute of Animal Science, RDA, Suwon, Republic of Korea
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/BW∨0.75/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/BW∨0.75/d for LCP, MCP, and HCP, respectively. The maintenance requirements for CP from the regression equation between CP intake and CP balance were 4.58 g/BW∨0.75/d (trial 1) and 5.02 g/BW∨0.75/d (trial 2) and lower than the value (5.56 g/BW∨0.75/d) adopted by Korean Feeding Standards for Hanwoo (2007).
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