Rumination, Particle Size and Passage from the Rumen

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Abstract
Physical events relating to particle size reduction of indigestible fiber in the rumer are important in regulating roughage intake, and hence, productivity of ruminants fed roughage diets. Particle size reduction is the limiting process in clearing of indigestible fibers from the rumen and rumination plays a major role in this process. Acidosis and high osmotic pressure can inhibit rumination activity and rumination alone is not responsible for the maintenance of normal VFA production. The reason that some small particles do not pass from the rumen remains unknown, but it is apparently because of entrapment in the rumen ingesta mass for long periods of time. Large animals appea to be more efficient ruminators than are small ones within species. Copyright © 1982. American Society of Animal Science . Copyright 1982 by American Society of Animal Science.

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