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The objective of this study was to examine the effects of an Aspergillus oryzae extract on milk production and composition and rumen metabolites in a commercial dairy herd. Early lactation Holstein cows, 282, in their second or greater lactation were used in a 60-day trial from August to October 2001. Cows were assigned to one of two treatments in a switchback design with two 30-day treatment periods...
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