The Ohio State University Department of Animal Science/Equine Program published a poster by three students titled “Influence of a Maternal Dietary Yeast Supplement on Immunoglobulin Concentrations in Foals from Birth to Four Months of Age.”
The authors of this poster, R. Leimbach, J. M. Reddish and K. Cole, concluded that, “maternal dietary yeast supplementation during late gestation and early lactation did not influence overall immunoglobulin concentrations in foals from parturition to 4 months of age.”
You can find this poster presentation from The Ohio State University.