Effects of sustained cold and heat stress on energy intake, growth and mitochondrial function of broiler chickens
文献类型: 会议论文
第一作者: SU Hong-guang
作者: SU Hong-guang 1 ; ZHOU Ting 1 ; ZHANG Shao-shuai 1 ;
作者机构: 1.State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, P.R. China
关键词: Broiler chicken;Cytochrome c oxidase;Energy intake;Metabolizability;Cold stress;Heat stress
会议名称: International Livestock Environment Symposium
主办单位:
页码: 164-174
摘要: We aimed to study broiler chickens' energy intake, growth, and mitochondrial function when exposed to sustained cold and heat stress and to establish a comfortable temperature for broiler production. Two hundred and eighty-eight broiler chickens weredivided randomly into six temperature-controlled chambers. Each chamber contained six cages including eight AA broilers per cage. After acclimation for 1 week, the temperatures of the chambers were adjusted (finished within 1 h) respectively to 10, 14, 18, 22, 26, or 30°C (relative humidity, 60%) and fixed for a 14-day experimental period. Our results confirmed that when the temperature was >26°Cfor 14 days, GEI, MEI and CCO were decreased significantly (P<0.05), but the concentration of liver mitochondrial protein was increased and metabolizability of broilers was not affected (P>0.05). Compared with treatment for 14 days, MEI/BW ratio was also significantly decreased after temperature of>26°Cfor 7 days (P<0.05), meanwhile mitochondrial protein concentration was increased at 10°C and CCO activity was not affected (P>0.05). Additionally at 22°C, ADG reached the maximal value. When kept in uncomfortable temperatures for a long time, ADG and CCO] activity were reduced, which was accompanied by mitochondrial hyperplasia. From the point of view of energy utilization, 22-26°C is comfortable for 28- to 42-day-old broilers. These results could provide a theoretical basis for high efficiency production.
分类号: s82-532
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