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Productive Limits to Rumen Fermentation^{1 ,2,}

Michigan State University, East Lansing 48824

Abstract

This paper is a review of the current knowledge on the productive limits to rumen fermentation. The following topics are discussed: Ruminal carbohydrate fermentation and ATP generation; heat and gas losses during ruminal fermentation; ruminal microbial growth yields and efficiency; Y_ATP and the maintenance coefficient; manipulation of fermentation products and growth efficiency; digesta passage and substrate disappearance; the role of ciliate protozoa in the rumen. This review reempha-sizes the need for even further study to enhance the utilization of feedstuffs for optimal animal production.

¹ Michigan Agricultural Experiment Station Journal Article No. 7906.

² Presented at the Symposium on Turning Rumen Fermentation On and Off to Maximize Animal Productivity, Northeast Sections of the American Society of Animal Science and American Dairy Science Association, July 12, 1976, Beltsville Agriculture Research Center, MD.

³ Ruminant Nutrition Laboratory, Department of Animal Husbandry.

⁴ Agricultural Fermentation and Nutrition Laboratory, Department of Animal Husbandry.