A composition, and method of use, for controlling, reducing or preventing the growth of protozoal bacteria in the rumen of a ruminant comprising cell bodies of a facultative anaerobe selected from the group consisting of Corynebacterium cell bodies and Brevibacterium cell bodies or a mixture of Corynebacterium cell bodies and Brevibacterium cell bodies, glutamic acid fermentation solubles, corn fermentation solubles, glutamic acid fermentation solubles and corn fermentation solubles.
