Journal of Animal Science and Technology

Korean Society of Animal Sciences and Technology (한국축산학회)
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Effects of Ad libitum and Restricted Feeding of Concentrates on Body Weight Gain, Feed Intake and Blood Metabolites of Hanwoo Steers at Various Growth Stages

배합사료의 자유 및 제한 급여가 거세한우의 성장단계별 증체, 사료섭취량 및 혈중 대사물질에 미치는 영향

  • Kwon, E.G. (National Livestock Research Institute, R.D.A.) ;
  • Hong, S.K. (National Livestock Research Institute, R.D.A.) ;
  • Seong, H.H. (National Livestock Research Institute, R.D.A.) ;
  • Yun, S.G. (National Livestock Research Institute, R.D.A.) ;
  • Park, B.K. (National Livestock Research Institute, R.D.A.) ;
  • Cho, Y.M. (National Livestock Research Institute, R.D.A.) ;
  • Cho, W.M. (National Livestock Research Institute, R.D.A.) ;
  • Chang, S.S. (National Livestock Research Institute, R.D.A.) ;
  • Shin, K.J. (National Livestock Research Institute, R.D.A.) ;
  • Paek, B.H. (National Livestock Research Institute, R.D.A.)
  • Published : 2005.10.31
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Abstract

Two hundred fifty eight Hanwoo steers were used in a completely randomized design experiment to determine the effects of ad libitum or restricted feeding of concentrates on body weight(BW) gain, feed intake, blood metabolites and hematological parameters. Steers were assigned at 6 months of age to feeding groups of ad libitum(T1) or restricted(T2) by 18 months of age. Steers in both groups were fed ad libitum from 19 months of age. The restrictive feeding levels were 1.2-1.5% of BW for the growing period and 1.7-1.8% of BW for the early fattening period. Average daily gains were significantly higher in T1 than in T2 from 10 to 14 months of age, but were significantly higher in T2 than in T1 from 20 to 24 months of age(p<0.05). Total dry matter intake(DMI) was higher in T1 than in T2 at 10, 12 and 16 months of age(p<0.05). Total DMI of T2 was higher than that of T1 at 22 months of age(p<0.05). Feed conversions were significantly lower in T2 than in T1 from 20 to 30 months of age(p<0.05). Blood albumin concentrations were significantly higher in T2 than in T1 at 12, 14, 16 and 18 months of age. Blood triglyceride concentrations were significantly higher in T1 than in T2 at 14 and 16 months of age(p<0.05). Blood inorganic phosphorus concentrations were significantly higher in T2 compared with T1 at 8, 10, 16 and 22 months of age(p<0.05). Mean corpuscular volume and mean corpuscular hemoglobin were significantly lower in T2 than in T1 from 8 to 12 months of age(p<0.05), but those were significantly higher in T2 than T1 from 10 months to 12 months of age(p<0.05). Present results may indicate that the restricted feeding for the growing period does not show adverse effects on body weight gain with better feed conversion for the following late fattening period.

본 연구는 한우 거세우 258두를 이용하여 배합사료 자유급여와 제한급여에 따른 증체량, 사료 섭취량, 혈중대사물질의 농도 및 혈액상에 대한 변화를 조사하기 위해 실시하였다. 시험구 배치는 전기간 배합사료 자유급여구(T1)와 생후 6-18개월령 배합사료 제한급여구(T2) 2처리로 하였으며, 배합사료의 제한급여 수준은 육성기에는 체중의 1.2-1.5% 그리고 비육전기에는 체중의 1.7-1.8% 수준으로 하였다. 생후 10-14개월령의 일당증체량은 T2구에 비해 T1구에서 많았으나(p<0.05), 20-24개월에는 T1구에 비해 T2구의 일당증체량이 많았다(p<0.05). 총 건물섭취량의 경우 생후 10, 12 및 16개월령에는 T1구에서, 22개월령에는 T2구에서 상대적으로 높은 결과(p<0.05)를 보였을 뿐 여타 월령에서는 차이가 없었다. 사료요구율은 20-30개월령까지 T1구에 비해 T2구에서 유의적으로 감소하였다(p<0.05). 생후 12, 14, 16 및 18개월령의 혈중 albumin 농도는 T1구에 비해 T2구에서 높았으나(p<0.05), 12-18개월령을 제외한 다른 월령에서는 처리간의 농도 차이는 없었다. 생후 14 및 16개월령의 혈중 triglyceride 농도는 T2구에 비해 T1구에서 높았으며(p<0.05), 8, 10, 16 및 22개월령의 혈중 IP 농도는 T1구에 비해 T2구에서 높았다(p<0.05). 생후 8-12개월령의 MCV와 MCH는 T1구에 비해 T2구에서 낮았으나(p<0.05), 10-12개월 MCHC는 T1구에 비해 T2구에서 높았다(p<0.05). 이상의 연구결과를 종합해 볼 때 육성기 배합사료 제한급여는 비육기 증체에 대한 부의 영향이 없고 비육후기 사료요구율도 감소시키기 때문에 육성기의 배합사료 제한급여가 바람직하다.

Keywords

References

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