Cattle fed heated soybean meal as a protein supplement had lower rumen protozoal counts than did those fed unheated soybean meal. Adding niacin to unheated soybean meal increased protozoal counts, but the difference was not significant. Adding niacin to heated soybean meal increased holotrich, entodiniomorph, and total protozoal counts. Apparently conventional heating of soybean meal makes niacin unavailable to rumen protozoa.
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Dennis et al. (1982) studied this question.
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