Reducing Protein Content with and Without Yeast Probiotic Actisaf Sc 47 Supplementation in the Diet of Dairy Cow: Effects on Nitrogen Use, Digestibility, and Rumen Microbial Protein

= 0.05); LCPActisaf did not impact NDF digestibility compared with LCP. Organic matter (OM) digestibility was similar among treatments. Although there was no difference between the three groups on rumen microbial protein synthesis (RMP), supplementation with Actisaf Sc 47 increased RMP. Reducing protein content in combination with Actisaf Sc 47 appears to be a good strategy, enabling both the environmental footprint linked to nitrogen losses to be reduced, and fiber digestibility and rumen microbial protein synthesis to increase.