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Article| Volume 83, ISSUE 1, P115-122, January 2000

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The Effect of Treating Forages with Fibrolytic Enzymes on its Nutritive Value and Lactation Performance of Dairy Cows1

Open ArchiveDOI:https://doi.org/10.3168/jds.S0022-0302(00)74862-4
The Effect of Treating Forages with Fibrolytic Enzymes on its Nutritive Value and Lactation Performance of Dairy Cows1
Previous ArticleEffect of Replacing Alfalfa Silage with High Moisture Corn on Nutrient Utilization and Milk Production1
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      Abstract

      Forages (corn silage and alfalfa hay) were sprayed with liquid enzymes prior to combining with a concentrate to form a total mixed ration (50% forage:50% concentrate, dry matter basis) and fed to lactating cows. In the first year, treatments were 1) no enzymes, 2) an enzyme complex containing 3500 carboxymethyl cellulase (CMCase) and 16,000 xylanase units per kilogram of forage dry matter, or 3) an enzyme complex containing 8800 CMCase units and 40,000 xylanase units. In the second year, the treatments were 1) no enzymes, 2) an enzyme complex as in yr 1 containing 3700 CMCase and 14,000 xylanase units, or 3) an enzyme complex using an alternative cellulase and containing 3600 CMCase and 11,000 xylanase units. In the first year, cows fed diet 2 tended to produce more milk (39.5 kg/d) than those fed diet 1 (37.0 kg/d) or those fed diet 3 (36.2 kg/d). The high level of enzyme treatment in diet 3 decreased the output of milk protein and fat compared to the low level of enzyme treatment. In the second year, cows fed diet 3 produced more milk (35.4 kg/d) than did those fed diet 1 (32.9 kg/d) and numerically more than those fed diet 2 (33.6 kg/d). Milk fat and protein were similar among treatments but numerically lower for cows fed enzyme-treated forages. Dry matter intake (kg/d) was similar among treatments in both years. Spraying certain doses and combinations of enzymes directly onto forages prior to feeding can improve milk yields but enzyme sources and dose levels are of critical importance.

      Key words

      Abbreviation Key:

      CMCase (carboxymethyl cellulase), EA2 (low level of a cellulase and xylanase enzyme mix), EA5 (high level of a cellulase and xylanase enzyme mix), EB1.2 (low level of an alternative cellulase and xylanase enzyme mix)

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      Article info

      Publication history

      Accepted: August 17, 1999
      Received: January 27, 1999

      Identification

      DOI: https://doi.org/10.3168/jds.S0022-0302(00)74862-4

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      © 2000 American Dairy Science Association. Published by Elsevier Inc.

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