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Antibiotic Selection00:57

Antibiotic Selection

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Prevention of Heat Stress Adverse Effects in Rats by Bacillus subtilis Strain
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Supplementing a Bacillus-based probiotic to high-risk stocker cattle.

Shea J Mackey1, Reinaldo F Cooke1, Autumn T Pickett1

  • 1Department of Animal Science, Texas A&M University, College Station, TX 77843, USA.

Journal of Animal Science
|July 25, 2024
PubMed
Summary

Bacillus probiotics did not improve average daily gain or reduce bovine respiratory disease (BRD) signs in high-risk steers. However, the probiotic supplementation decreased mortality and improved overall pasture productivity.

Keywords:
beef steersgrazinghealthproductivitystockerstress

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Area of Science:

  • Animal Science
  • Veterinary Medicine
  • Microbiology

Background:

  • High-risk stocker cattle often experience health challenges, including bovine respiratory disease (BRD).
  • Bacillus-based probiotics are explored for their potential to improve cattle health and performance.
  • Understanding the impact of probiotics on physiological responses and productivity in grazing cattle is crucial.

Purpose of the Study:

  • To evaluate the effects of a Bacillus-based probiotic on performance, health, and physiological responses of high-risk steers during a 90-day grazing period.
  • To assess the probiotic's impact on average daily gain (ADG), BRD incidence, mortality, and pasture-based liveweight change.
  • To investigate changes in acute-phase protein concentrations as an indicator of health status.

Main Methods:

  • 240 Angus-influenced steers were divided into two groups: one receiving a Bacillus subtilis + B. licheniformis probiotic (BOV) and a control group (CON).
  • Steers grazed on native grass pastures for 90 days, receiving daily supplementation with dried distillers' grains.
  • Performance (BW, ADG), health (BRD signs, mortality), and physiological (plasma haptoglobin) parameters were monitored throughout the experiment.

Main Results:

  • No significant differences were found in final body weight or ADG between the BOV and CON groups.
  • Plasma haptoglobin concentrations were higher in CON steers on days 14 and 28, indicating a reduced acute-phase response in the BOV group.
  • Mortality and removals for health complications were significantly greater in the CON group compared to the BOV group (5.04% vs. 0.00%).
  • The BOV group showed improved total pasture-based liveweight change and final pasture-based total liveweight.

Conclusions:

  • Supplementation with Bacillus subtilis and B. licheniformis probiotic did not improve BRD incidence or ADG in high-risk stocker cattle.
  • The probiotic decreased acute-phase protein response and significantly reduced steer mortality and removals.
  • The study demonstrated increased pasture-based productivity in steers supplemented with the Bacillus-based probiotic.