Validation of alternative behavioral observation methods in young broiler chickens

Area of Science:

• Animal Behavior
• Ethology
• Poultry Science

Background:

• Continuous behavioral observation is the gold standard but labor-intensive.
• Efficient methods are needed to accurately assess broiler chicken behavior.
• Scan sampling and automated tracking offer potential alternatives to continuous observation.

Purpose of the Study:

• Validate scan sampling intervals (0.5 to 30 min) for broiler chicken behavior.
• Assess the accuracy of automated tracking software (EthoVision XT 14) for behavior analysis.
• Compare these methods against continuous behavioral observation.

Main Methods:

• Video recording of ten 19-day-old broiler chickens over 8 hours.
• Analysis using continuous sampling, scan sampling (0.5-30 min intervals), and automated tracking.
• Statistical validation criteria: R² ≥ 0.9, slope ≈ 1, intercept ≈ 0.

Main Results:

• 0.5-min scan sampling accurately estimated active, eating, drinking, and maintenance behaviors.
• 1-min scan sampling accurately estimated active, inactive, eating, and maintenance behaviors.
• 5-min scan sampling accurately estimated inactive behavior; no interval accurately estimated behavior bouts. Automated tracking accurately detected inactive behavior duration but not activity.

Conclusions:

• Instantaneous scan sampling up to 1-minute intervals can accurately observe high-frequency broiler chicken behaviors.
• Automated tracking software shows promise for identifying inactivity but requires further development for activity detection.
• Refined scan sampling and automated tracking methods can reduce labor in behavioral research.