The purpose of this study was to determine the effects of different light regimes on molting in growing turkeys and chickens.
Two groups of Beltsville Small White turkeys were reared from 3 to 24 weeks of age under two extremes of artificial light; one group received 10 hours and the other 24 hours of light daily. At 24 weeks of age, birds were exchanged between treatments and all birds were observed for 4 additional weeks. A detailed study was made of the molt that occurred during the entire growing period. The different amounts of light apparently had no effect on the time required for the growth and maturity of individual feathers.
Crossbred chicks (few Hampshire-White Plymouth Rocks) were reared to 10 and 12 weeks of age under eight different light regimes which included two starting light treatments four finishing light treatments and all combinations of starting and finishing light treatments. At 10 weeks of age chicks reared from 6 weeks of age under continuous light averaged 7.5, 11.3, and 17.1 percent fewer undesirable body feathers than birds reared during that time under 5, 10, and 15 hours, respectively, of light daily. At 12 weeks of age there was little difference between the body-feathering condition of birds reared from 6 weeks of age under 5, 10, and 24 hours of light daily. The number of undesirable body feathers on birds in each of these groups, however, was significantly smaller than the number on birds reared under 15 hours of light.
In White Plymouth Rock female chickens observed from 10 to 26 weeks of age there was a greater amount of feather growth in primaries 1 and 2 of birds reared under continuous light than was found in corresponding feathers of birds reared under 10 hours of daily light. There was a greater amount of total feather growth in the axial, secondaries, and in the tail feathers of birds receiving only 10 hours of light daily than in birds receiving continuous light. (Abstract shortened by UMI.)
Details
The purpose of this study was to determine the effects of different light regimes on molting in growing turkeys and chickens.Two groups of Beltsville Small White turkeys were reared from 3 to 24 weeks of age under two extremes of artificial light; one group received 10 hours and the other 24 hours of light daily. At 24 weeks of age, birds were exchanged between treatments and all birds were observed for 4 additional weeks. A detailed study was made of the molt that occurred during the entire growing period. The different amounts of light apparently had no effect on the time required for the growth and maturity of individual feathers.Crossbred chicks (few Hampshire-White Plymouth Rocks) were reared to 10 and 12 weeks of age under eight different light regimes which included two starting light treatments four finishing light treatments and all combinations of starting and finishing light treatments. At 10 weeks of age chicks reared from 6 weeks of age under continuous light averaged 7.5, 11.3, and 17.1 percent fewer undesirable body feathers than birds reared during that time under 5, 10, and 15 hours, respectively, of light daily. At 12 weeks of age there was little difference between the body-feathering condition of birds reared from 6 weeks of age under 5, 10, and 24 hours of light daily. The number of undesirable body feathers on birds in each of these groups, however, was significantly smaller than the number on birds reared under 15 hours of light.In White Plymouth Rock female chickens observed from 10 to 26 weeks of age there was a greater amount of feather growth in primaries 1 and 2 of birds reared under continuous light than was found in corresponding feathers of birds reared under 10 hours of daily light. There was a greater amount of total feather growth in the axial, secondaries, and in the tail feathers of birds receiving only 10 hours of light daily than in birds receiving continuous light. (Abstract shortened by UMI.)Details
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