Location: Livestock Issues ResearchTitle: Evaluation of Bacillus subtilis PB6 probiotic (CLOSTAT-500®) on feedlot phase growth performance, efficiency of dietary net energy utilization, and fecal and subiliac lymph node Salmonella prevalence
|SMITH, ZACHARY - South Dakota State University|
|UNDERWOOD, KEITH - South Dakota State University|
|RUSCHE, W.C. - South Dakota State University|
|WALKER, J.A. - South Dakota State University|
|Carroll, Jeffery - Jeff Carroll|
|LAFLEUR, DOUG - Kemin Industries, Inc|
|HERGENREDER, ERILYN - Kemin Industries, Inc|
Submitted to: American Society of Animal Science
Publication Type: Abstract Only
Publication Acceptance Date: 12/22/2020
Publication Date: 5/7/2021
Citation: Smith, Z.K., Broadway, P.R., Underwood, K.R., Rusche, W., Walker, J., Sanchez, N.C., Carroll, J.A., Lafleur, D., Hergenreder, E.E. 2021. Evaluation of Bacillus subtilis PB6 probiotic (CLOSTAT-500®) on feedlot phase growth performance, efficiency of dietary net energy utilization, and fecal and subiliac lymph node Salmonella prevalence. American Society of Animal Science. 99(1):119-120. https://doi.org/10.1093/jas/skab054.198.
Technical Abstract: Yearling beef steers (n=238; initial BW=402 ± 31.2 kg) were used to evaluate a Bacillus subtilis probiotic on growth performance, dietary net energy (NE) utilization, carcass characteristics, and fecal and subiliac lymph node Salmonella prevalence during a 140-d finishing period. Steers were allotted to 24 pens (n=9 to 10 steers/pen) and assigned to one of two treatments (12 pens/treatment): no probiotic (CON) or 0.50 g·steer-1·d-1 of a Bacillus subtilis PB6 probiotic (CLOSTAT-500®, Kemin Industries, Des Moines, IA; CLO). Steers were transitioned to a 90% concentrate diet (DM basis) over 14-d. Steers were fed once daily at 0700 h; bunks were managed according to a slick bunk management. Fecal samples were collected on d 1, 28, 56, 112, and 140 from each pen (n=5 steers/pen) via rectal palpation and composited by pen for determination of Salmonella prevalence. Upon harvest, subiliac lymph nodes were obtained from an equal number of steers from each treatment. Data were analyzed as a randomized complete block design; pen was the experimental unit; a of 0.05 determined significance. No differences were detected (P=0.25) between treatments for live or carcass-adjusted average daily gain, dry matter intake, gain efficiency, dietary NE utilization, nor calculated dietary NE content based upon performance. No differences were detected between treatments for any carcass traits (P=0.15). Salmonella was not recovered in any fecal samples except on d 112, where steers from CLO had a numerically lower (P=0.17; 8.3 vs. 25.0%) incidence of fecal Salmonella compared to CON and on d 140 fecal, where Salmonella incidence did not differ (P=0.34; 0.0 vs. 8.3%) for CON and CLO, respectively. Salmonella was not recovered in any subiliac lymph nodes. These data indicate that CLO did not influence growth performance, or fecal Salmonella prevalence. Salmonella was not observed in the subiliac lymph nodes of any steers upon harvest.