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, Shea J Mackey Department of Animal Science - Texas A&M University, College Station , TX 77843, USA Search for other works by this author on: Oxford Academic Reinaldo F Cooke Department of Animal Science - Texas A&M University, College Station , TX 77843, USA Corresponding author: reinaldo.cooke@tamu.edu Search for other works by this author on: Oxford Academic Autumn T Pickett Department of Animal Science - Texas A&M University, College Station , TX 77843, USA Search for other works by this author on: Oxford Academic Bruno I Cappellozza Novonesis, Hørsholm 2970 , Denmark Search for other works by this author on: Oxford Academic Kelsey M Harvey Prairie Research Unit - Mississippi State University, Prairie, MS , 39756, USA Search for other works by this author on: Oxford Academic Brandi B Karisch Department of Animal and Dairy Sciences - Mississippi State University, Starkville , MS 39762, USA Search for other works by this author on: Oxford Academic
Journal of Animal Science, skae209, https://doi.org/10.1093/jas/skae209
Published:
25 July 2024
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Received:
14 June 2024
Published:
25 July 2024
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Shea J Mackey, Reinaldo F Cooke, Autumn T Pickett, Bruno I Cappellozza, Kelsey M Harvey, Brandi B Karisch, Supplementing a Bacillus-based probiotic to high-risk stocker cattle, Journal of Animal Science, 2024;, skae209, https://doi.org/10.1093/jas/skae209
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Abstract
This experiment evaluated performance, health, and physiological responses of high-risk steers receiving a Bacillus-based probiotic during a 90-d grazing period. A total of 240 Angus-influenced steers were used in this experiment that was replicated over 2 yr (120 steers/year). Each year, steers were obtained from an auction yard and transported to the experimental facility (120 km). Steer body weight (BW) was recorded at arrival (d -1), and this value was averaged with BW recorded on d 0 to represent initial BW (236.6 ± 1.5kg). On d 0, steers were ranked by BW and allocated to 1 of 12 pastures with stockpiled native grass (4-ha pastures; 10 steers/pasture). Pastures were randomly assigned to receive daily supplementation with dried distillers’ grains at 1% of BW containing either: 1) Bacillus subtilis + B. licheniformis probiotic (BOV; 2g/steer daily of Bovacillus™; Novonesis, Horsholm, Denmark) or 2) no feed additive (CON). Cattle received treatments from d 0 to 90, in addition to free-choice access to water and mineral + vitamin mix without ionophore. Steers were assessed for bovine respiratory disease (BRD) signs daily. Blood samples were collected and full BW was recorded on d 0, 14, 28, 56, and 90. Shrunk BW was recorded on d 91 after 16h of feed and water restriction, and a 4% pencil shrink was used to calculate final BW. Average daily gain (ADG) was calculated based on initial and final BW. No treatment effects were detected (P ≥ 0.73) for steer final BW and ADG. A treatment × day interaction was detected (P ≤ 0.05) for plasma haptoglobin concentration, which was greater for CON steers on d 14 and 28 (P ≤ 0.02). Incidence of BRD signs did not differ (P = 0.97) between treatments (51.7 and 51.3% for BOV and CON, respectively; SEM = 7.70). However, steer mortality + removals for health complications were greater (P = 0.01) in CON compared to BOV (0.00 vs. 5.04%, respectively; SEM = 1.41). Supplementing BOV improved (P ≤ 0.04) total pasture-based liveweight change (643 vs. 502kg/pasture, respectively; SEM = 45) and final pasture-based total liveweight (3,007 vs. 2,869kg/pasture, respectively; SEM = 46). Collectively, supplementation with a probiotic based on B. subtilis and B. licheniformis to high-risk stocker cattle did not alleviate incidence of BRD signs nor improved ADG, but decreased acute-phase protein response, reduced steer mortality + removal, and increased pasture-based productivity during a 90-d grazing period.
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© The Author(s) 2024. Published by Oxford University Press on behalf of the American Society of Animal Science. All rights reserved. For commercial re-use, please contact reprints@oup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact journals.permissions@oup.com.
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Issue Section:
Ruminant Nutrition
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