8Geraert P A ,PadilhaJ C F, Guillaumin S. Metabolic and endocrine changes induced by chronic heat exposure in broiler chickens:growth performance ,body composition and energy retention [J]. Brit J Nutr, 1996,75 : 195-204.
9Austic Yousse F R E. Feeding poultry in hot and cold climates [A]. M. Stress Physiology in Livestock [M]. Florida:CRC Press, 1985,123-136
