This review summarises recent research on the effects of Diamond V XP Yeast Culture (DVXP) on dairy cows and calves. In a trial conducted on a commercial dairy farm in Victoria, Australia, Friesian and Jersey × Friesian cows supplemented with Rumensin did not produce
more milk than those supplemented with DVXP. In a second trial carried out in Victoria, Australia, DVXP supplementation increased milk production of Friesian cows by 2.2 L/d. Milk fat and protein content did not differ. The increased milk production was attributed
to greater feed intake and utilization. The intake of Wagyu × Friesian and Friesian calves fed a starter diet containing 2% DVXP until 15 weeks of age and 0.75% DVXP from 16–21 weeks of age was increased by 18% and pre–weaning weight gain was increased by 14.3%. In a trial conducted in New Zealand, the inclusion of 1.2% DVXP in the diet of mixed–breed calves aged 7–10 days at the beginning of the trial improved average daily gain by 11.3%. This improvement was maintained throughout the pre–ruminant stage (days1–17) and into the ruminant phase (days 17–71).