Figure 2. Differences in BW were observed in ducks under blue
light. At each age measured, ducks housed under blue light had reduced
BW compared to ducks housed under white or red lights. At d 21,
ducks under red light also showed reduced BW compared to ducks
under white light, although still heavier than ducks under blue light.
Letters indicate statistically different groups at each age. P < 0.05.