Location: Livestock Issues ResearchTitle: The effect of supplementing CLOSTAT® 500 (Bacillus subtilis PB6) to yearling steers in a commercial feedyard on health, Salmonella spp. prevalence, feedlot performance and carcass characteristics
|TROJAN, SARAH - Peak Beef Nutrition And Management Consulting, Llc|
|Carroll, Jeffery - Jeff Carroll|
|HALES, KRISTIN - Texas Tech University|
|WORD, ALYSSA - Cactus Feeders, Inc|
|KARR, KENDALL - Cactus Feeders, Inc|
|ELLIS, GUY - Cactus Feeders, Inc|
|MAXWELL, CASEY - Cactus Feeders, Inc|
|CANTERBURY, LANDON - Kemin Industries, Inc|
Submitted to: Journal of Animal Science Supplement
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/21/2022
Publication Date: 10/3/2022
Citation: Trojan, S.J., Broadway, P.R., Sanchez, N.C., Carroll, J.A., Hales, K.E., Word, A.B., Karr, K.C., Ellis, G., Maxwell, C., Canterbury, L.G. 2022. The effect of supplementing CLOSTAT® 500 (Bacillus subtilis PB6) to yearling steers in a commercial feedyard on health, Salmonella spp. prevalence, feedlot performance and carcass characteristics. Journal of Animal Science Supplement. 100(3):28-29. https://doi.org/10.1093/jas/skac247.053.
Technical Abstract: Crossbred beef steers, n = 2,100; 313 ± 38 kg initial body weight (BW) were used to evaluate Bacillus Subtilis PB6 supplementation to yearling steers. Cattle were blocked by arrival date and assigned randomly to pen within block; pens were randomly assigned to treatment within block. Treatments, replicated in 15 pens/treatment with 70 steers/pen, included: 1) control (CON), diets containing no supplemental direct fed microbials; 2) CLOSTAT (CLO), diets supplemented with 0.5 g/hd/d Bacillus subtilis PB6 (CLOSTAT® 500, Kemin Industries, Des Moines, IA). Supplementing CLO reduced morbidity (P = 0.03), 10.38% (CLO) vs. 13.43% (CON), decreased the percentage of cattle treated once for bovine respiratory disease (BRD; P < 0.01), 9.14% (CST) vs. 12.76% (CON), and decreased BRD re-treatment rate (P = 0.03). Mortality did not differ among treatments (P = 0.23). Cattle removed from the study tended to be less for CLO than CON (53 vs. 73 head respectively, P = 0.06). The prevalence of fecal Salmonella was not different among treatments, (P = 0.35). Overall fecal Salmonella counts tended to be less for CLO (1.59 log CFU/g) than for CON (2.04 log CFU/g; P = 0.07). Concentration of Salmonella in subiliac lymph nodes did not differ by treatment (P = 0.62); however, mean prevalence of lymph node Salmonella decreased 46% by CLO (28.66% vs. 15.48%, CON vs. CLO, respectively, P = 0.46). With deads and removals included, final BW was heavier for CLO steers than CON, (P = 0.05), and average daily gain (ADG; P = 0.08), and gain efficiency (G:F, P = 0.06) tended to be greater for CLO than CON. With deads and removals excluded, final BW, ADG, and G:F did not differ among treatments (P = 0.30). Carcass traits were similar between treatments (P = 0.15). Supplementing CLO improved health outcomes of yearling steers.