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Ruminal Changes after Overfeeding with Wheat and the Effect of Intraruminal Inoculation on Adaptation to a Ration Containing Wheat¹

U. S. Department of Agriculture

Abstract

Eight lambs were fed cracked wheat through ruminal fistulas. Four of these were inoculated intraruminally with ruminal contents from sheep that had been adapted to a diet containing wheat. The inoculated lambs did not become sick, while three of four lambs that were not inoculated exhibited symptoms typical of overeating indigestion. In another experiment a sheep that was inoculated with ruminal ingesta from a wheat-adapted sheep did not get sick after wheat was fed while, a sheep that was not inoculated became sick. A subsequent experiment with these two sheep indicated that animal differences may have influenced the results. Thus, it is probable that animal as well as microbial factors are active in regulating tolerance or adaptation to a changed ration.

The results obtained support the premise that a change in ruminal microbial population in response to a changed ration is an important factor influencing tolerance and adaptation to a new ration. Furthermore, the rate of adaptation to a new ration may be accelerated by intraruminal inoculation with ruminal material from an animal adapted to that ration.

¹ National Animal Disease Laboratory, Animal Disease and Parasite Research Division, ARS, Ames, Iowa.

² The authors express their appreciation to William B. Buck, National Animal Disease Laboratory, for assistance in surgical placement of ruminal fistulas.

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