《动物营养学报》英文论文格式模板..doc

《动物营养学报》英文论文格式ietary Energy Level on Growth Performance and Carcass Composition of Wujin Pigs ZHANG Xi ZHAO Su-mei GE Chang-rong LAI Hua LI Chang-qiang GAO Shi-zheng* (Yunnan Key Laboratory of Animal Nutrition and Feed Science, Yunnan Agricultural University, Kunming 650201, China) Abstract: (Objective)The aim of the present study was to investigate the effects of dietary digestible energy levels on growth performance and carcass composition in Wujin pigs, and to investigate the most suitable dietary energy density for maximum growth potential and best carcass composition using the fuzzy comprehensive evaluation model. (Method) The experimental approach was by single factor random allotment. Ninety pigs were randomly allotted into five groups of 18, and fed diets containing 14.22, 13.60, 12.98, 12.36 and 11.74 MJ/kg of digestible energy. (Result) Results showed that the daily gain was reduced and the feed gain ratio increased gradually with reduction in dietary energy levels. No significant differences were found in the groups at body weight of 15～30 kg (P0.05). At the body weight of 60 and 100 kg, lean meat weight, lean meat ratio and loin eye area were increased, but fat weight, fat percentage and back fat thickness were decreased with reduction in dietary energy levels. From the fitting curve, the most suitable dietary energy levels for best growth performance at body weights of 15～30 kg, 3060 kg and 60～100 kg w 14.01, 13.15 and 12.98 MJ/kg, respectively. Using lean meat ratio, back fat thickness and loin eye area to represent the carcass composition, the optimal dietary energy densities were 11.13, 11.36 and 11.71 MJ/kg at 15～30 kg, 30～60 kg and 60～100 kg, respectively. (Conclusion)Optimum dietary energy were 13.55, 12.81 and 13.20 MJ/kg for a combination of growth performance and carcass composition. Key words: Digestive energy; Growth performance; Carcass composition; Wujin pigs Wujin pigs is a typical Chinese local breed in Yunnan province and its