The lactational response of dairy cows fed fiber-degrading enzymes has been scarce and inconsistent. The effectiveness of fiber-degrading enzymes to improve milk production has only been observed in 30 percent of studies; however, eight experiments showed positive results.
Based on the experiments included in this literature review, the average increase in milk yield due to the enzyme addition was 5.5 lbs./day (2.6 to 13.9 lbs./ day); none of these experiments reported reduction in milk yield when the cows were fed fiber-degrading enzymes. The response, however, was highly dependent on enzyme dosage, enzyme combination and the method of enzyme application to the diets
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