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Journal of Dairy Science Vol. 73 No. 6 1560-1563
© 1990 by American Dairy Science Association ®
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Effect of Yeast Culture on Nutrient Digestibility and Milk Yield Response in Early- to Midlactation Dairy Cows

M. J. Arambel 1 and B. A. Kent 1

1 Department of Animal, Dairy, and Veterinary Sciences, Utah State University, Logan 84322-4815

Twenty Holstein daily cows in early lactation were allocated equally to one of two treatments on the basis of age, days in milk, and mean daily 2-wk pretrial milk yield. All animals were fed a total mixed ration; the ration for the treatment group was top-dressed with 90 g/d of yeast culture, Saccharomyces cerevisiae. Treatment period lasted 10 wk. Mean daily DM intake, milk production, milk composition, and BW were not significantly affected by treatment. Feed and fecal samples were collected the last 3 d of the treatment period to determine apparent total tract nutrient digestibility using ADF insoluble ash as the inert marker. No significant differences in digestibility were observed between treatment groups for CP, ADF, and NDF.

Key Words: yeast culture • digestibility • milk yield

Submitted on May 17, 1989
Accepted on January 12, 1990




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