An increase in the input costs in the dairy industry has demonstrated the need for methods to increase production efficiency. One way of increasing efficiency would be to increase the bioavailability of nutrients in a feed stuff, which might be accomplished through the direct feeding of enzymes (Yang et al. 1999). The use of enzymes as additives in ruminant diets has received considerable research interest recently following positive responses observed in feeding trials (Lewis et al. 1995; Beauchemin and Rode, 1996). The objective of present study was to determine the effects of an enzyme mixture (Natuzyme, Bioproton Pty Ltd, Australia) on dairy cow performance.

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