Effects of bacterial direct-fed microbials on ruminal fermentation, blood variables, and the microbial populations of feedlot cattle1,2

G. R. Ghorbani, D. P. Morgavi, K. A. Beauchemin, J. A. Z. Leedle
2002 Journal of Animal Science  
A study was conducted to determine whether bacterial direct-fed microbials (DFM) could be used to minimize the risk of acidosis in feedlot cattle receiving high concentrate diets. Six ruminally cannulated steers, previously adapted to a high concentrate diet, were used in a double 3 × 3 Latin square to study the effects of DFM on feed intake, ruminal pH, and ruminal and blood characteristics. Steers were provided ad libitum access to a diet containing steam-rolled barley, barley silage, and a
more » ... ley silage, and a protein-mineral supplement at 87, 9, and 4% (DM basis), respectively. Treatments were as follows: control, Propionibacterium P15 (P15), and Propionibacterium P15 and Enterococcus faecium EF212 (PE). The bacterial treatments (10 9 cfu/g) plus whey powder carrier, or whey powder alone for control, were top-dressed once daily at the time of feeding (10 g/[steer/d]). Periods consisted of 2 wk of adaptation and 1 wk of measurements. Ruminal pH was continuously The authors thank Bev Farr, Alastair Furtado, Tom Thiessen, Rena Wuerfel, and Marina Maekawa for their assistance in conducting the experiment and performing laboratory analyses and the staff of the Lethbridge Research Centre metabolism unit for care of the cattle.
doi:10.2527/2002.8071977x pmid:12162668 fatcat:b7dj3fxry5hzvgjofw3do2xwmy