Yeast culture may play a positive role in restricted-fed heifer diets. During the study, Penn State researchers restricted or limit-fed a high-concentrate or low-concentrate TMR to heifers between 10 and 14 months of age. The high-concentrate diet contained 40 percent corn silage and 60 percent grain. The low-concentrate diet consisted of 80 percent corn silage and 20 percent grain. The addition of yeast to both diets improved digestibility. Limit-fed heifers fed the high-grain diet also produced less manure. Yeast culture appeared to enhance this effect. The results were presented in July at the American Dairy Science Association annual meeting.