Factors affecting broiler processing parameters and plasma corticosterone

Area of Science:

• Animal Science
• Avian Physiology
• Endocrinology

Background:

• Broiler production involves managing physiological stress responses.
• Plasma corticosterone (C) is a key indicator of stress in poultry.
• Understanding factors influencing C levels is vital for broiler welfare and productivity.

Purpose of the Study:

• To investigate the impact of broiler strain, sex, and dietary energy on resting plasma corticosterone.
• To examine the relationship between plasma corticosterone and production/processing parameters.
• To determine the effect of broiler age on plasma corticosterone levels.

Main Methods:

• Experiment 1: Assessed plasma corticosterone and production traits (weight, carcass yield, abdominal fat) in five broiler strains fed low or high energy diets.
• Experiment 2: Measured resting plasma corticosterone in broilers at 4, 6, and 8 weeks of age.
• Statistical analyses were used to determine significant differences and interactions.

Main Results:

• Broiler strain and dietary energy did not directly influence plasma corticosterone, but a strain x energy interaction was observed.
• Sex did not affect plasma corticosterone, though females had higher abdominal fat percentages.
• Plasma corticosterone levels significantly decreased with increasing broiler age (4 weeks vs. 6 and 8 weeks).

Conclusions:

• Broiler age is a critical factor influencing plasma corticosterone levels and must be considered in research.
• While production traits are affected by strain and diet, plasma corticosterone responses are complex and age-dependent.
• Further research is needed to fully elucidate the interplay between broiler physiology, environment, and stress indicators.