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Effects of sustained cold and heat stress on energy intake, growth and mitochondrial function of broiler chickens
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org
Citation: 10th International Livestock Environment Symposium (ILES X) .(doi:10.13031/iles.18-035)
Authors: Shuai Shao Zhang, Guang Hong Su, Ying Zhou, Mei Xiu Li, Hong Min Zhang, Dr, Hai Jing Feng, Dr
Keywords: Broiler chicken, Cytochrome c oxidase, Energy intake, Metabolizability, Cold stress, Heat stress.
Abstract. 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 were divided 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°C for 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°C for 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.
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