Supplementing a -based direct-fed microbial improves feed efficiency in lactating dairy cows.

This experiment was conducted to evaluate the effects of feeding a -based direct-fed microbial () on performance and nutrient digestibility of lactating dairy cows. Seventy-six lactating (42 ± 6 days in milk []) Holstein-Friesian primiparous and multiparous cows were enrolled to a 16-wk experiment. Cows were blocked by lactation number and DIM and within blocks, assigned to 1 of the 2 treatments: 1) basal partial-mixed ration () without DFM addition ( = 38; ) or 2) basal PMR with the addition of 3 g/head/d of a DFM containing 809 and 810 ( = 38; BOVACILLUS, Chr.