Yuan, KaiMuckey, Mary BethMendonca, LuisHulbert, Lindsey E.Bradford, Barry J.2015-04-222015-04-222015-04-22http://hdl.handle.net/2097/18983Dairy Research, 2014 is known as Dairy Day, 2014Yeast supplementation has been shown to increase feed intake and production in some studies with early lactation dairy cows, but the mechanisms underlying this effect remain unknown. The objective of this study was to assess the effects of supplementing a yeast product derived from Saccharomyces cerevisiae on production, feeding behavior, and immune function in cows during the transition to lactation. When fed for 3 weeks before calving through 6 weeks after calving, supplementation altered feeding behavior as well as responsiveness to vaccination and gut immunoglobulin secretion. Results suggest that yeast products can modulate several aspects of immune function and promote the consumption of smaller, more frequent meals.en-USTransition dairy cowYeastNutritionImmunityConference paper