Effects of Enzyme Application Method and Levels and Pre-treatment Times on Rumen Fermentation, Nutrient Degradation and Digestion in Goats and Steers

  • Hong, S.H. (School of Agricultural Biotechnology, Seoul National University) ;
  • Lee, B.K. (Agribrands Purina Korea, Inc.) ;
  • Choi, N.J. (School of Agricultural Biotechnology, Seoul National University) ;
  • Lee, Sang S. (School of Agricultural Biotechnology, Seoul National University) ;
  • Yun, S.G. (National Livestock Research Institute R.D.A.) ;
  • Ha, J.K. (School of Agricultural Biotechnology, Seoul National University)
  • Received : 2002.01.10
  • Accepted : 2002.10.16
  • Published : 2003.03.01


Present study investigate the effect of enzyme supplementation, methods (applied to rumen or enzyme treated diet) compared with no enzyme diet, on rumen fermentation and apparent nutrient digestibility in a $3{\times}3$ Latin square design with three rumen cannulated Korean Native goats. In situ rumen degradation kinetics was studied in three rumen cannulated Holstein steers. Three diets were, no enzyme, 1% enzyme in rumen and 1% enzyme in diet. The enzyme was sprayed onto forage, and the forage: concentrate ratio was 30:70. Degradation kinetics was studied with three enzyme levels (0, 1 and 2%, w/w) and four pre-treatment times (0, 1, 12 and 24 h). Results suggested that enzyme application method did not affect rumen fermentation, ruminal enzyme activity and total tract apparent digestibility. Nutrient degradation rate and effective degradability of DM, NDF and ADF increased with increasing enzyme level and pre-treatment times. Degradation of nutrients was affected by enzymes levels or pre-treatment times. Therefore, it is probable that the improved degradation may be due to the supplemented exogenous hydrolytic enzymes under a certain condition.


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