Corticosterone sampling of laying hens in different management systems

Area of Science:

• Animal Science
• Veterinary Medicine
• Animal Welfare

Background:

• Laying hen welfare is crucial in modern agriculture.
• Stress indicators like plasma corticosterone are vital for assessing hen well-being.
• Understanding the impact of housing systems on stress is essential.

Purpose of the Study:

• To investigate the effect of different management conditions (cages vs. floor pens) on laying hen stress levels.
• To analyze diurnal variations in plasma corticosterone in response to housing.
• To correlate housing type with physiological stress indicators in poultry.

Main Methods:

• Plasma corticosterone levels were measured in laying hens.
• Hens were housed in either cage or floor pen systems.
• Blood samples were collected in both morning and afternoon to assess diurnal corticosterone patterns.

Main Results:

• Afternoon plasma corticosterone levels were significantly higher in floor-housed hens compared to caged hens.
• No significant differences in morning plasma corticosterone were observed between the two housing systems.
• These findings suggest diurnal rhythm impacts stress indicator sensitivity to management conditions.

Conclusions:

• Floor housing systems may induce subtle adverse conditions in laying hens.
• Elevated baseline corticosterone in the afternoon (nadir) indicates chronic stress in floor-housed hens.
• Peak corticosterone levels during the diurnal cycle may not be as sensitive to subtle environmental stressors in poultry.