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Journal of Dairy Science Vol. 81 No. 12 3214-3221
© 1998 by American Dairy Science Association ®
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Effect of a Saccharomyces cerevisiae Culture on Nutrient Digestion in Lactating Dairy Cows

M. Doreau 1 and J. P. Jouany 1

1 Institut National de la Recherche Agronomique, Theix, F63122 Saint-Genès-Champanelle, France

The digestive effects of a Saccharomyces cerevisiae culture were investigated. Four cows in early lactation that were fitted with ruminal and duodenal cannulas were used in a crossover design. The diet, which consisted of 60% corn silage and 40% concentrates, was supplemented or not supplemented with a daily dose of 50 g of premix containing 0.5 g of S. cerevisiae (6 x 108 cfu/g of premix). Total and ruminal digestibilities of organic matter, duodenal flows of nonmicrobial and microbial N, solid and liquid turnover rates, ruminal protozoal numbers, pH, ammonia N and volatile fatty acid concentrations, and concentrations of some plasma metabolites were not modified by the addition of S. cerevisiae. Ruminal dry matter content increased when S. cerevisiae was supplemented to the diet. In situ ruminal degradabilities of dry matter and neutral detergent fiber from corn stalk and of N from soybean meal were not modified; degradability of acid detergent fiber from corn stalk increased (32.5% vs. 26.3%) with the addition of S. cerevisiae. A short-term increase in N degradation was observed after 4 and 8 h of incubation. This experiment showed no effect of S. cerevisiae on most quantitative digestive events; however, a positive transitory postprandial effect on some parameters of microbial activity was observed.

Key Words: dairy cow • Saccharomyces cerevisiae • digestion • rumen

Submitted on February 23, 1998
Accepted on July 27, 1998




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