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Feed Intake Evaluation of Korean Cattle (Hanwoo) Fed Diets Containing Different Levels of Compound Fattening Periods

한우의 육성 및 비육기간중 배합사료 급여 수준에 따른 사료섭취량 조사

  • Shin, K.J. (National Livestock Research Institute, RDA) ;
  • Oh, Y.G. (National Livestock Research Institute, RDA) ;
  • Lee, S.S. (National Livestock Research Institute, RDA) ;
  • Kim, K.H. (National Livestock Research Institute, RDA) ;
  • Kim, C.H. (National Livestock Research Institute, RDA) ;
  • Paik, B.H. (National Livestock Research Institute, RDA)
  • 신기준 (농촌진흥청 축산기술연구소) ;
  • 오영균 (농촌진흥청 축산기술연구소) ;
  • 이성실 (농촌진흥청 축산기술연구소) ;
  • 김경훈 (농촌진흥청 축산기술연구소) ;
  • 김창현 (농촌진흥청 축산기술연구소) ;
  • 백봉현 (농촌진흥청 축산기술연구소)
  • Published : 2002.02.28

Abstract

A study was conducted to evaluate feed intake of Hanwoo bulls and steers fed diets of compound feed and rice straw. Twenty bull calves and sixty steers at 5 to 7 months old were used. The experimental period was divided into three feeding stages which are growing period (〈300 kg body weight (BW)), early fattening period (300-450 kg BW) and late fattening period (〉450 kg BW). The animals were given the diets containing 14.1% crude protein (CP) and 70.0% total digestible nutrients (TDN) in the growing period, 12.1% CP and 70.6% TDN in the early fattening period, and 11.2% CP and 71.9% TDN in the late fattening period, respectively. Experiment 1 was designed to compare feed intake (as-fed basis) between Hanwoo bulls and steers fed the experimental diets ad libitum. In Experiment 2, Hanwoo steers were allocated in one of three compound feed feeding treatments to investigate feed intake (as-fed basis). The treatment groups were ① feeding level 1 group fed compound feed ad libitum through the whole periods; ② feeding level 2 group fed 1.0% compound feed per kg BW in the growing period, 1.5% compound feed per kg BW in the early fattening period and compound feed ad libitum in the late fattening period; and ③ feeding level 3 group fed 1.5% compound feed per kg BW in the growing period, 2.0% compound feed per kg BW in the early fattening period and compound feed ad libitum in the late fattening period. In Experiment 1, the average daily feed intake of bulls increased linearly through the whole experimental period while the feed intake of steers increased until their body weight was reached upto 521 kg, afterward reduced. Average daily feed intake was about 3.5% per kg BW of both bulls and steers at the beginning (150 kg BW) of Experiment 1 while bulls and steers at 600 kg BW consumed the diets of 2.0 and 1.5% per kg BW, respectively. In Experiment 2, the average daily feed intake of steers in the feeding level 1 group gradually increased through the growing and early fattening periods and then steadily reduced over the late fattening period. The average daily feed intake in the feeding level 2 group linearly increased through the whole period while the feed intake in the feeding level 3 group showed a relatively rapid increase and reached a peak at 455 kg BW, and then sharply dropped. The average daily feed intake of steers in the feeding level 1 at the beginning (150 kg BW) of Experiment 2 was about 3.5% per kg BW but there was a reduction (1.5% per kg BW) at 600 kg BW. Besides, The feed intake of steers in the feeding level 2 and 3 in which compound feed was given with limitation increased to 2.0-3.0% per kg BW in the growing period and then reduced to 1.5-2.0% per kg BW. The limited compound feed feeding of steers in Experiment 2 resulted in higher rice straw intakes up to two to three folds and two folds in the growing and early fattening periods, respectively, than the ad libitum feeding.

Keywords

Feed intake;Hanwoo;Compound feed;Rice straw;Body weight

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