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Manipulating Rumen Fermentation^{1 ,2,}

University of Maryland^,4, College Park 20742

Abstract

Fermentation efficiency and the nutrient outflow from the rumen can be adjusted by manipulating the microbes and their activities with chemical agents which modulate selected pathways of metabolism (i.e., VFA production, methanogenesis, amino acid degradation, ureolysis), by controlling rate of water removal from the rumen, and by regulating pH. Concomitant adjustments in the quantity and efficiency of production by the animal are determined by utilization of the altered nutrient pattern by the host ruminant's tissue system. The type and extent of manipulation needed to maximize animal productivity can be expected to vary with and depend upon the nature of the diet and physiological functions performed.

¹ 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 the American Dairy Science Association, July 12, 1976, Beltsville Agricultural Research Center, MD.

² Scientific Article no. A-2227, Contribution no. 5214 of the Maryland Agricultural Experiment Station, Department of Dairy Science.

³ Present address: Nutrition Section, Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, New Bolton Center, Kennett Square, PA 19348.

⁴ Department of Dairy Science.