Actigraph as a Device for Estimation of Heat Production of White Leghorn Hens under High Ambient Temperature

摘要: Eight commercial Single Comb White Leghorn hens were used to study the effects of high ambient temperature on behavioral activities and select a better parameter for estimation heat production between activity count standing time. The kept at temperatures 25, 29, 33°C fed ad libitum. Daily feed intake decreased with increase temperature. total time increased significantly temperature, specially occurred in dark periods 29 33°C, 247% (P<0.01) 413% (P<0.01), respectively, compared 25°C. Heat per hour both light On other hand, daily counts almost same all temperatures. levels during comparison that changed their pattern, minimized when introduced higher From analysis variance multiple regression equations, contribution rates (counts/h) (min/h) towards (kJ/kg0.75/h) 65% 23%, respectively. Therefore, give results regards estimating hens.