Figure 5. Duck behavioral analyses part 3. Overall, ducks housed
under blue light showed considerably increased activity compared to
ducks under red or white lights particularly around d 14 and 21. Ducks
under red light showed reduced motor activity compared to other treatments
beginning at d 14 and continuing until the end of the study. The
reduced activity may be a factor in the reduced preening and foraging
behaviors observed (Figure 4). Letters indicate statistically different
groups at each age. P < 0.01.