| Popis: |
THE data of Heywang (1944) show that no increase in their egg production or feed consumption, or better maintenance of their weight, resulted from subjecting laying pullets to artificial light, either from midnight to daylight or all night, during hot weather. These pullets could eat during both the hotter and the cooler parts of the day, for there is quite a difference between day and night air temperatures in the region where the data were obtained. It seemed to the writer, however, that both the slow growth of young chickens and the low egg production of laying chickens that usually occur during hot weather might be stimulated to some extent if their feeding time were restricted to the cooler part of the day. Consequently, experiments were conducted at the Southwest Poultry Experiment Station, Glendale, Arizona, in which the feeding time of young chickens and of laying pullets was so restricted. . . . |
