Effect of light intensity on confinement rearing of male turkeys

Light intensities of .11, 1.1, 11 and 33 lux of 12 hours per day duration were studied for their effect on growth rate and feed utilization efficiency. The two experiments were initiated when the birds were 3 weeks old. Up to 12-14 weeks of age, the .11 lux intensity was superior to the other treatments. After this age, the other treatments were superior. Two other experiments were conducted with a crossover design. Birds were reared under either 11 or .11 lux from 3 to 12 weeks of age, than half of each group was maintained, and half was switched to either the higher or lower, intensity. Best growth up to 12 weeks of age was associated with .11 lux. Best growth to 22 weeks was associated with 11 lux. Crossing from high to low or low to high had no beneficial effects in either experiment.