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Early heat exposure effect on the heat shock proteins in broilers under acute heat stress

Darae Kang1, Kwanseob Shim2

  • 1Department of Animal Biotechnology, College of Agriculture Life Science, Jeonbuk National University, Jeonbuk, Republic of Korea.

Poultry Science
|March 3, 2021
PubMed

Insights

Early heat conditioning improved broiler feed conversion and reduced acute heat stress responses. This study investigated heat shock protein expression and physiological markers in broilers subjected to heat treatments.

Area of Science:

  • Animal Science
  • Physiology
  • Poultry Science

Background:

  • Poultry production faces significant challenges from heat stress, impacting growth and physiological well-being.
  • Early life interventions are crucial for developing resilience in broilers against environmental stressors.

Purpose of the Study:

  • To evaluate the impact of early heat conditioning on the acute heat stress response in broilers.
  • To assess effects on growth performance, key hormones (dopamine, serotonin, corticosterone), and heat shock protein (HSP) expression.

Main Methods:

  • A 35-day experiment involving 144 broiler chicks divided into three groups: control (optimum temperature), heat-conditioned (40°C on day 35), and early heat-conditioned (40°C on days 5 and 35).
  • Measurements included body weight gain, feed conversion ratio, serum corticosterone levels, and liver expression of HSP70 and HSP40 proteins.

Main Results:

  • Early heat conditioning (HH group) showed lower body weight gain on day 7 but improved feed conversion ratio by day 35.
  • Heat-treated groups (CH and HH) exhibited reduced weight gains compared to the control group.
  • Liver HSP70 expression was highest in the CH group, while HSP40 expression was elevated in the CH group compared to the control.

Conclusions:

  • Early heat conditioning shows potential in mitigating some negative effects of acute heat stress in broilers.
  • Further research is needed to optimize conditioning protocols for maximum benefit and understand underlying molecular mechanisms.

Keywords:
acutebroilerheat shock proteinheat stress

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