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Related Experiment Video

Updated: Oct 25, 2025

In Ovo Feeding of Commercial Broiler Eggs: An Accurate and Reproducible Method to Affect Muscle Development and Growth

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Published on: September 20, 2021

Modeling the performance of broilers under heat stress.

I Andretta¹, M Kipper², G D Schirmann¹

¹Department of Animal Science, Federal University of Rio Grande do Sul, 91540-000, Brazil.

Poultry Science

|August 6, 2021

Summary

This summary is machine-generated.

Heat stress significantly reduces broiler growth and feed intake, especially in older birds. Constant heat stress is worse than cyclic, and dietary electrolyte balance has minimal impact on performance.

Keywords:

electrolyte balance hot climate meta-analysis poultry

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Area of Science:

Animal Science
Poultry Science
Environmental Physiology

Background:

Heat stress (HS) negatively impacts broiler performance, a critical concern in poultry production.
Understanding the specific effects of HS type and its interaction with diet is crucial for mitigation strategies.

Purpose of the Study:

To model performance depression in broilers under heat stress.
To analyze the influence of cyclic versus constant HS.
To assess the correlation between dietary electrolyte balance (DEB) and HS in broilers.

Main Methods:

Meta-analysis of two databases (initial and growing phases) including performance and temperature data.
Selection criteria: experiments with thermoneutral and high temperatures, ADFI, ADG, and ad libitum feed/water.
Performance evaluated as raw data or relativized 'HS effect'; HS type classified as cyclic or constant.

Main Results:

In the growing phase (over 21 d), HS reduced average daily gain (ADG) by 2.1% and average daily feed intake (ADFI) by 1.4% per °C above the upper critical temperature.
Feed conversion (FC) was not significantly affected by HS in either phase.
Constant HS had a more detrimental effect on performance than cyclic HS in broilers over 21 days of age.

Conclusions:

Heat stress significantly impacts broiler performance, particularly in the growing phase, with constant HS being more detrimental than cyclic.
ADFI is the most sensitive performance metric to heat stress, while FC remains unaffected.
The correlation between dietary electrolyte balance and broiler performance under heat stress is weak, suggesting limited mitigation potential from DEB adjustments alone.