The Effects of Dietary Aspirin and Humidity on the Performance of Light and Heavy Breed Chicks ,

HIGH environmental temperatures, 29°C. or over, as compared to lower environmental temperatures, 21°C. or less, have been shown to depress growth in young chicks (Kleiber and Dougherty, 1934; Winchester and Kleiber, 1938; Squibb et al, 1959; Adams et al, 1962). At optimal temperatures, relative humidity has not been shown to have any appreciable effect on growth or feed efficiency. Barrott and Pringle (1949) found that relative humidities ranging from 35 to 75% had no effect on growth of chicks from 1 to 18 days of age when brooding temperature was held constant. Prince et al. (1965) observed no differences in growth or feed efficiencies with chicks grown from 4 to 8 weeks of age in relative humidities of 52, 70, and 90%, either at 12.6°C. or at 23.8°C. At high environmental temperatures, the results have been variable. In 1964, Kamar and Khalifa reported that with adult birds maintained at a . . .