Ultraviolet light preferences in a white and a brown layer pullet strain

Area of Science:

• Animal Science
• Avian Biology
• Photobiology

Background:

• Adequate lighting is crucial for laying hen health, welfare, and productivity.
• Ultraviolet-A (UVA) light, present in natural chicken environments, may positively impact welfare.

Purpose of the Study:

• To investigate breed-specific preferences of layer pullets for different UVA light levels.
• To assess time spent and behaviors exhibited under low-UVA versus high-UVA light conditions.

Main Methods:

• Two breeds (Lohmann LSL Classic - white, Lohmann Brown Classic - brown) were housed in pens with distinct UVA light levels.
• Automated video analysis and instantaneous scan sampling were used to record bird distribution and behavior over 10 weeks.

Main Results:

• White pullets showed a preference for high-UVA light in the first three weeks; brown pullets did not exhibit a clear preference.
• Brown pullets preferred low-UVA light in week 2 during twilight periods, with no consistent preference at other times or ages.
• No significant differences in behavior proportions were observed between low-UVA and high-UVA light conditions for either breed.

Conclusions:

• Layer pullets may not have an exclusive preference for either low or high UVA light levels.
• Breed differences in UVA light preference might exist, particularly in younger birds.