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Research Note: Water applied direct-fed microbial reduced mortality in heat stressed broilers.

S A S van der Klein1, M Bernardeau1, K Gibbs1

  • 1Danisco Animal Nutrition and Health (IFF), 2342 BH, Oegstgeest, The Netherlands.

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Summary

A direct-fed microbial (DFM) product containing Lactobacillus acidophilus AG01 and Bifidobacterium animalis AG02 significantly reduced mortality in broiler chickens under heat stress conditions. While growth performance was not improved, the DFM enhanced resilience to heat-related mortality.

Keywords:
bifidobacteriumlactobacillusprobiotic

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Area of Science:

  • Animal Science
  • Poultry Nutrition
  • Microbiology

Background:

  • Antibiotic use in poultry is under scrutiny, driving research into alternatives like direct-fed microbials (DFM) for gut health.
  • Heat stress negatively impacts intestinal health and performance in broiler chickens.
  • DFMs are potential tools to mitigate negative effects of environmental stressors in poultry.

Purpose of the Study:

  • To evaluate the efficacy of a water-administered DFM product on broiler performance and health during summer heat stress.
  • To assess the impact of a specific dual-strain DFM (Lactobacillus acidophilus AG01 and Bifidobacterium animalis AG02) on broiler chickens subjected to elevated temperatures.

Main Methods:

  • Broiler chickens (Ross 308) were assigned to control or DFM treatment groups (1x10^8 CFU/bird/d).
  • Birds were housed in floor pens and fed a standard three-phased diet.
  • Growth performance (body weight, feed intake, feed conversion ratio) and mortality were recorded throughout 42 days, with birds experiencing natural heat stress.

Main Results:

  • No significant differences in growth performance were observed between control and DFM groups; however, body weight at day 42 was 19% below breed standard for both.
  • The DFM treatment significantly reduced overall mortality from 5.83% to 0.83% (P = 0.027) between days 1-42.
  • Mortality during the finisher phase (days 25-42), attributed to heat stress and hypoxia, was significantly lower in the DFM group (0.44%) compared to controls (2.88%).

Conclusions:

  • The dual-strain DFM supplementation demonstrated a significant protective effect against heat-stress-induced mortality in broiler chickens.
  • The DFM may enhance intestinal homeostasis and barrier function, contributing to increased resilience against environmental stressors like heat stress.
  • Further research is warranted to elucidate the specific mechanisms by which this DFM improves broiler resilience under heat stress.