Effects of Fibrolytic Enzyme Addition on Ruminal Fermentation, Milk Yield and Milk Composition of Dairy Cows

Fibrolytic Enzyme 첨가가 반추위 발효 성상 및 착유우의 유량 및 유성분에 미치는 영향

  • Ahn, J. H. (Department of Dairy Science, Hankyong National University) ;
  • Kim, Y. J. (Department of Dairy Science, Hankyong National University) ;
  • Kim, H. J. (Department of Dairy Science, Hankyong National University)
  • 안종호 (한경대학교 낙농과학과) ;
  • 김연정 (한경대학교 낙농과학과) ;
  • 김현진 (한경대학교 낙농과학과)
  • Published : 2003.02.28


We evaluated the effects of adding fibrolytic enzyme into ruminant diets on ruminal fermentation (in vitro) and lactational performances of dairy cows (in vivo). Through the in vitro experiment that was carried out with different contents of NDF (34, 38, 43%) in diets, digestibilities of NDF in the rumen appeared not significantly different by the addition of enzyme but were different by NDF content in diets showing higher digestibility in NDF 43% diet. It could be attributed by the relatively higher amount of hemicellulose in the current experimental diets than in conventional diets that might have been digested easily by the addition of fibrolytic enzyme in the rumen. The addition of fibrolytic enzyme tended to increase NDF digestibilities to a little extent both in 0.05 and 0.1% enzyme levels. Ruminal pH, NH3-N concentrations and VFA production in the rumen were not affected by the addition of fibrolytic enzyme. Activities of CMCase and xylanase were higher in enzyme treated diets of both NDF 34 and 38%. In particular, the activities of xylanase that slowly decreased from 0 to 12 hr but rapidly after 24 hr indicates that the major action of the enzyme in the rumen occurs in early period of incubation. Through an in vivo experiment, fibrolytic enzyme addition into the diets of dairy cows indeed affected lactational performance of milk yield. The cows fed enzyme treated diets produced 8% (1.9kg/d) more amounts of milk than with no enzyme addition. Milk composition of milk fat and protein was not affected by enzyme addition. Overall, the results of this in vivo study indicates that fibrolytic enzyme can be used to improve milk production in lactating cows. In respect that animals in different treatments of this study had the same amounts of intake, the increased milk yield with enzyme addition may be attributed to the improved utilization of nutrients in the digestive tract.


Fibrolytic enzyme;Milk yield;Milk composition;Rumen fermentation


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