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Effects of Heat Treatment of Three Animal by-products on Ruminal Degradation Characteristics and Intestinal Availability of Crude Protein

동물성 부산물 사료 세 종류에 대한 열처리가 조단백질의 반추위내 분해특성 및 하부장기내 이용성에 미치는 영향

  • Moon, Y.H. (Department of Animal Science and Biotechnology, Chinju National University) ;
  • Lee, S.C. (National Livestock Research Institute, RDA) ;
  • Kim, B.K. (Kyungbuk Livestock Research Institute)
  • 문여황 (전주산업대학교 동물생명과학과) ;
  • 이상철 (축산기술연구소) ;
  • 김병기 (경북축산기술연구소)
  • Published : 2002.02.28

Abstract

In order to investigate the effects of heat treatment of three animal by-products(feather meal, tallow meal, viscera meal) on in situ ruminal degradation characteristics and gastrointestinal availability of dietary crude protein(CP), three ruminally and duodenally cannulated dry Holstein cows were employed. Cows were fed a diet containing 60% concentrate and 40% orchard grass hay, and had free access to water and mineral block. Experimental feeds were processed for 4 hr at 149$^{\circ}C$ in a forced-air oven, and were passed through a 1-mm screen. Degradation kinetics of feed protein in the rumen were fitted to an exponential type model, and intestinal availability was estimated by the mobile nylon bag technique. Effective CP degradabilities in the rumen for feather meal, tallow meal and viscera meal were 30.2%, 75.0% and 56.4% at 5% passage rate per hour(k=0.05), respectively. In addition, heat treatment increased effective ruminal CP degradability on feather meal and viscera meal treatments, whereas decreased in tallow meal treatment(P$<$0.05). Gastrointestinal CP disappearances of feather meal, tallow meal and viscera meal were 56.2%, 18.6%, and 37.9%, respectively. In addition, heat treatment decreased the gastrointestinal CP disappearance on feather meal and viscera meal treatment, but increased in tallow meal treatment(P$<$0.05). Intestinal availability of rumen undegradable protein(A-UDP) was 80.4% for feather meal, 83.8% for tallow meal and 86.9% for viscera meal. In addition, heat treatment increased A-UDP on feather meal and tallow meal treatment, 94.0% and 91.3%, respectively, but decreased on viscera meal treatment, 76.5%(P$<$0.05).

Keywords

Animal by-products;Heat treatment;Mobile nylon bag;Ruminal degradability;Intestinal availability

References

  1. AFRC. 1993. Energy and protein requirements of ruminants. CAB International. Wellinford, U.K.
  2. Agricultural Research Council. 1984. The nutrient requirements of ruminant livestock. Slough, Bucks Commonwealth Agricultural Bureaux.
  3. Broderick, G. A. and Craig, W. M. 1980. Effect of heat treatment on ruminal degradation and escape, and intestinal digestibility of cottonseed meal protein. J. Nutr. 110:2381.
  4. Chalupa, W. 1975. Amino acid nutrition of growing cattle. In : Tracer studies on non-protein nitrogen for ruminants. II. Proc. Res. Coordination meeting and panel. Int. Atomic Energy Agency. Vienna
  5. Cheftel, J. c., Cucq, J. L. and Lorient, D. 1985. Les proteines duble. In: J. C. Cheptel, J. L. Cucq and D. Lorient(Eds), Proteines Alimentaires. Technique et Documentation(Lavoisier) paris, France, p. 204.
  6. de Boer, G., Mupphy, J. 1. and Kennelly, J. 1. 1987. A modified method for determination of in situ rumen degradation of feedstuffs. Can. J. Anim. Sci. 67:93.
  7. Janick, F. J. and Stallings. C. C. 1988. Degradation of crude protein in forages determined by in vitro and in situ procedures. J. Dairy Sci. 71:2440
  8. Mahadevan, S. J., Ertle. D. and Sauer, F. D. 1980. Degradation of soluble and insoluble protein by bacteroides amylophilus and by microorganism. J. Anim. Sci. 50:723.
  9. Marquardt, W. 1963. An algorithm for least squares estimation of nonlinear parameters. Soc. Ind. Appl. Math, 11:431.
  10. NRC. 1988. Nutrient Requirements of dairy cattle. 6th rev. ed Natl. Acad. Sci., Washington. D. C.
  11. Orskov, E. R. and MacDonald, I. 1979. The estimation of protein degradability in the rumen from incubation measurements weighted according to rate of passage. J. Agr. Sci.(Camb.). 92:499.
  12. SAS. 1988. User's Guide : Statistical Analysis Systems Institute. Inc. Cary, NC
  13. Stern, M. D., Santos, K. A. and Satter, L. D. 1985. Protein degradation in the rumen and amino acid absorption in the small intestine of lactating dairy cattle fed heat treated whole soybeans. 1. Dairy Sci. 68:45.
  14. Stock, R., Merten, N., Klopfenstein, T. and Poos, M. 1981. Feeding value of slowly degraded proteins. J. Anim. Sci., 53:1109.