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 in spring placement yearli
|SMITH, ZACHARY - South Dakota State University|
|Carroll, Jeffery - Jeff Carroll|
|LAFLEU, DOUG - Kemin Industries, Inc|
|HERGENREDER, ERILYN - Kemin Industries, Inc|
Submitted to: Translational Animal Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 1/6/2021
Publication Date: 1/9/2021
Citation: Smith, Z.K., Broadway, P.R., Sanchez, N.C., Carroll, J.A., Lafleu, 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 in spring placement yearling beef steers fed in southeastern South Dakota. Translational Animal Science. 5(1):txab002. https://doi.org/10.1093/tas/txab002. PMID:33604519; PMCID: PMC7881255.
Interpretive Summary: Food safety is a concern for producers and consumers as the U.S. tries to maintain a safe and abundant food supply. One way to control foodborne pathogens is to feed cattle probiotics. Probiotics may also improve growth and overall animal health. Scientists from the Livestock Issues Research Unit in Lubbock, TX, South Dakota State University and Kemin Industries fed a probiotic to feedlot cattle to determine if it could improve growth and decrease Salmonella. Results from this study showed no differences in the growth rate of cattle fed the probiotic. Also, no Salmonella was isolated from the cattle over the first month of feeding. These results are important for producers, animal health professionals, and consumers as they make management decisions in the Northern Plains of the U.S.
Technical Abstract: Crossbred beef steers (n = 238; initial BW = 419 ± 32.4 kg) were used to investigate the influence of a Bacillus subtilis probiotic on animal growth performance responses and fecal Salmonella prevalence during a 28-d feedlot receiving period at the South East Research Farm (SERF) in Beresford, SD. Steers were allotted to one of 24 pens (n = 9 to 10 steers/pen) and assigned to one of two dietary 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 stepped-up from a 70% concentrate diet (DM basis) to a 92% concentrate diet (DM basis) over the course of 14-d. Fecal samples were collected on study d 1 and 28 (corresponding to 6 and 34 d following arrival to the SERF, respectively) from a subsample of steers from each pen (n = 5 steers/pen) via rectal palpation and composited by pen for determination of Salmonella prevalence using selective enrichment and culture medias. Steers were fed once daily at 0700 h, and bunks were managed according to a slick bunk management approach. Data were analyzed as a randomized complete block design and pen served as the experimental unit; an a of 0.05 determined significance. No differences were detected (P = 0.25) between treatments for ADG, DMI, or gain efficiency during the initial 28-d feedlot receiving phase. No Salmonella was recovered in any fecal samples collected. These data indicate that Bacillus subtilis PB6 did not influence receiving phase growth performance, and fecal Salmonella prevalence was not observed in yearling steers placed on feed in March in southeastern South Dakota.