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1 Dairy Science Department, South Dakota State University, Brookings, SD 57007-0647
2 Finnfeeds International, Marlborough, Wiltshire, UK
Fifty Holstein cows (20 primiparous and 30 multiparous) were used in an experiment to evaluate the dose response to a direct-fed cellulase and xylanase enzyme mixture applied to the forage portion (60% corn silage and 40% alfalfa hay) of a total mixed ration just prior to feeding. Cows were fed one of five treatment diets for 12 wk. Diets 1 through 4 were 55% forage:45% concentrate and consisted of an untreated control and the control diet plus 0.7, 1.0, or 1.5 L of enzyme concentrate/tonne of forage dry matter, respectively. Diet 5 was an untreated 45% forage: 55% concentrate diet. Actual production of milk increased as much as 10.8% relative to the control diet with 1.5 L of enzyme, and production of fat and protein increased as much as 20 and 13%, respectively. The lowest concentration of enzyme treatment (0.7 L/tonne) accounted for approximately one-half of the production increases. The responses to enzyme-treated forages occurred 2 to 4 wk after the cows started to consume the treated forages, and the same responses were maintained throughout the remainder of the experiment. Cows that started to receive enzyme-treated forage during the first 100 d postpartum produced 9 to 15% more milk and 16 to 23% more energy-corrected milk than did cows fed the control diet. However, production was not increased when cows were in midlactation at the start of the experiment. Responses to enzyme-treated forages fed in 55: 45 forage to concentrate rations were similar to the response to increased proportions of concentrates fed with untreated forages at the 45:55 forage to concentrate ratio.
Key Words: fiber • enzymes • digestion • lactating cows
Submitted on July 20, 1998
Accepted on December 28, 1998
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