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Effects of Manufacturing Methods of Broiler Litter and Bakery By-product Ration for Ruminants on Physico-chemical Properties

육계분과 제과부산물을 이용한 반추가축용 완전혼합사료(TMR) 제조 시 가공처리 방법이 물리화학적 특성에 미치는 영향

  • Kwak, W.S. (Animal Science, School of Life Resource and Environmental Sciences College of Natural Sciences, Konkuk university) ;
  • Yoon, J.S. (Animal Science, School of Life Resource and Environmental Sciences College of Natural Sciences, Konkuk university) ;
  • Jung, K.K. (Dept. of Animal and Life Science, College of Natural resources, Yeungnam University)
  • 곽완섭 (건국대학교 자연과학대학 생명자원환경과학부 축산학전공) ;
  • 윤정식 (건국대학교 자연과학대학 생명자원환경과학부 축산학전공) ;
  • 정근기 (영남대학교 자연자원대학 생물자원학부 동물생명과학전공)
  • Published : 2003.08.30

Abstract

This study was conducted to develop effective manufacturing methods of a total mixed ration(TMR) composed of broiler litter(BL) and bakery by-product(BB) for ruminants. Five experiments included a small-scaled manufacture of TMR using a deepstacking method(Exp. 1), its pelletization(Exp. 2), its field-scaled manufacture(Exp. 3), a field-scaled manufacture using an ensiling method(Exp. 4), and a mixing process of deepstacked BL and BB prior to feeding(Exp. 5). BL and BB were mixed at a ratio which makes total digestible nutrients of the TMR 69%. For each experiment, temperature, appearance and physico-chemical properties were recorded and analyzed. The chemical composition data revealed that the mixture of BL and BB showed nutritionally additive balance which resulted from a considerable increase(P<0.05) of organic matter and a desirable decrease(P<0.05) of protein and fiber up to the requirement level for growing ‘Hanwoo’ steers. Deepstacking of BL and BB in Exp. 1 and 3 resulted in a sufficient increase of stack temperature for pasteurization, little chemical losses, appearance of white fungi on the surface, and partial charring due to excess stack temperature. For Exp. 2, its pelleting, which was successful using a simple, small-scaled pelletizer, resulted in a little loss(P<0.05) of organic matter and an increase(P<0.05) of indigestible protein(ADF-CP). Ensiling the mixture in Exp. 4 made little effect on chemical composition; however, one month of the ensiling period was not enough for favorable silage parameters. Deepstacking BL alone in Exp. 5 tended(P<0.1) to decrease true protein : NPN ratio and hemicellulose content and increase ADF-CP content due to the heat damage occurred. Deepstacking or ensiling of BL-BB mixtures and simple incorporating of BB into deepstacked BL prior to feeding could be practical and nutrients-preservative methods in TMR manufacture for beef cattle, although ensiling needed further hygienic evaluation.

Keywords

Broiler litter;Bakery by-product;Deepstacking;Ensiling;Feed;TMR

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