Relation of All-Night Light to Egg Quality in Turkeys

ALL-NIGHT lights bring turkey hens into production a little earlier than morning lights that extend the day to 14 hours, but there may be unfavorable effects on reproduction such as reduced hatchability (Scott, 1937; Davis, 1948; Asmundson and Moses, 1950). A test was set up which would provide some information about (1) the effectiveness of dim all-night lights, (2) the effect of changing all-night light to a 14 hour day after the birds started laying, and (3) the value of adding vitamin A, vitamin D, and riboflavin to a presumably adequate ration. The housing and management of the birds was similar to that reported earlier (Asmundson, Lorenz and Moses 1946; Asmundson and Moses 1950). The birds in pen 40 were given a ration containing more of vitamins A and D by doubling the fish oil; the riboflavin was increased by feeding 1 percent more of a fermentation product containing 250 . . .