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KMID : 1025520070490030369
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Journal of Animal Science and Technology
2007 Volume.49 No. 3 p.369 ~ p.378
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Effects of Different Levels of CP Intake on Protein Utilization and N Excretion in Varying Growth Stages of Hanwoo Steers
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Oh Young-Kyoon
Nam In-Sik
Choi Chang-Weon
Baek Kyung-Hoon
Kim J.- H.
Kim Do-Hyeong
Seol Yong-Joo
Kim Kyoung-Hoon
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Abstract
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Three experiments with different stage of Hanwoo steers (average BW of 167kg, 355kg and 449kg, respectively) were conducted to examine the effect of different quantities of CP intake with similar DM intake on protein balance and N excretion. Twelve Hanwoo steers in each experiment were offered three diets containing three levels of protein (9, 14 and 18% on DM basis) in the concentrate formulated with using different amount of ground corn grain or corn gluten meal. There were significant effects of increasing CP intake on CP digestibility but not on DM digestibility. Despite different CP intake, apparent fecal N outputs were not significantly affected. However, amounts of N excreted into urine increased (p<0.05) with increasing CP intake. There was an obvious effect of live body weight on efficiency of body protein conversion of CP consumed in excess of animal requirement for maintenance, with slopes of 70% and 46~39% for growing and fattening stage, respectively. Nitrogen excretion into feces and urine in this experiment was 70% of the daily N consumption for fattening stage, compared with 60% for growing stage.
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KEYWORD
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CP intake, Growth stages, Hanwoo steers, N excretion
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