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Effects of Different Levels of CP Intake on Protein Utilization and N Excretion in Varying Growth Stages of Hanwoo Steers

한우 거세우의 성장단계별 CP 급여수준이 단백질 체내 이용성 및 N 배설량에 미치는 효과

  • Oh, Y.G. (National Institute of Animal Science, RDA) ;
  • Nam, I.S. (National Institute of Animal Science, RDA) ;
  • Choi, C.W. (National Institute of Animal Science, RDA) ;
  • Baek, K.H. (National Institute of Animal Science, RDA) ;
  • Kim, J.H. (Department of Animal Science and Environment, Konkuk University) ;
  • Kim, D.H. (Division of Applied Life Science, Gyeongsang University) ;
  • Seol, Y.J. (Division of Applied Life Science, Gyeongsang University) ;
  • Kim, K.H. (National Institute of Animal Science, RDA)
  • 오영균 (농촌진흥청 축산과학원) ;
  • 남인식 (농촌진흥청 축산과학원) ;
  • 최창원 (농촌진흥청 축산과학원) ;
  • 백경훈 (농촌진흥청 축산과학원) ;
  • 김정훈 (건국대학교 동물생산환경학과) ;
  • 김도형 (경상대학교 낙농학과) ;
  • 설용주 (경상대학교 낙농학과) ;
  • 김경훈 (농촌진흥청 축산과학원)
  • Published : 2007.06.30

Abstract

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.

Keywords

CP intake;Growth stages;Hanwoo steers;N excretion

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