FIFTY-EIGHT Duroc pigs averaging 11 or 17 kg were utilized to study the effects of supplementing diets for growing-finishing swine with dormantized saccharomyces cervisiae yeast culture (SCYC) as measured by performance and carcass characteristics. Pigs were allotted to either an 18 or 16% protein diet initially. Protein levels were lowered 2% at 34 and 61 kilograms. SCYC constituted 2% of the diet up to 34 kg and 1.5% of the diet from 34 to 100 kilograms. The diets contained an antibiotic supplement. SCYC did not have any significant (P<.05) effect upon mean daily gain, mean daily feed consumtpion, gain/feed or carcass characteristics. Pigs receiving the higher protein diets had a significantly (P<.05) greater gain/feed than pigs fed the lower protein diets.
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Bowman et al. (1973) studied this question.