Li Enkai, Lv Zhiqian, Liu Hu, Liu Ling, Li Yakui, Li Zhongchao, Wang Fenglai, Li Defa, Zhang Shuai
State Key Laboratory of Animal Nutrition, Ministry of Agriculture Feed Industry Centre, China Agricultural University, Beijing, China.
Anim Sci J. 2018 Jan;89(1):149-157. doi: 10.1111/asj.12888. Epub 2017 Sep 15.
The objectives of this experiment were: (i) to determine the net energy (NE) of soybean oil (SBO) fed to growing pigs using indirect calorimetry (IC); and (ii) to evaluate the effects of inclusion rate of SBO on heat production, oxidative status and nutrient digestibility in growing pigs. Eighteen growing barrows were allotted to three diets based on completely randomized design with six replicate pigs (period) per diet. Diets included a corn-soybean meal basal diet and two test diets containing 5% or 10% SBO at the expense of corn and soybean meal. During each period, pigs were individually housed in metabolism crates for 14 days, including 7 days to adapt to feed, metabolism crate and environmental conditions. On day 8, pigs were transferred to the open-circuit respiration chambers for measurement of daily O consumption and CO and CH production. During this time, pigs were fed one of the three diets at 2.4 MJ metabolizable energy/kg body weight (BW) /day. Total feces and urine were collected and daily total heat production (THP) was measured from days 9 to 13 and fasted on day 14 to evaluate their fasting heat production (FHP). The results show that trends of decreased apparent total tract digestibility of neutral detergent fiber (linear, P = 0.09) and acid detergent fiber (linear, P = 0.07) were observed as the content of dietary lipids increased. The average THP for the three diets were 1326, 1208 and 1193 kJ/kg BW /day, respectively. The FHP of pigs averaged 843 kJ/kg BW /day and was not affected by diet characteristics. A reduction of the respiratory quotients in the fed state as the inclusion level of SBO increased was observed. In conclusion, the NE values of SBO we determined by indirect calorimetry were 33.45 and 34.05 MJ/kg dry matter under two inclusion levels. THP could be largely reduced when SBO is added in the feed, but the THP of SBO included at 5% in a corn-soybean meal diet is not different from the THP of SBO included at 10%.
（i）使用间接测热法（IC）测定生长猪饲喂大豆油（SBO）的净能（NE）；（ii）评估SBO添加比例对生长猪产热、氧化状态和养分消化率的影响。18头生长公猪根据完全随机设计分为三种日粮，每种日粮6头重复猪（阶段）。日粮包括玉米-豆粕基础日粮和两种试验日粮，分别用5%或10%的SBO替代玉米和豆粕。在每个阶段，猪单独饲养在代谢笼中14天，包括7天适应饲料、代谢笼和环境条件。在第8天，将猪转移到开路呼吸室中，测量每日耗氧量、二氧化碳和甲烷产量。在此期间，以2.4 MJ代谢能/千克体重（BW）/天的量饲喂三种日粮中的一种。收集全部粪便和尿液，在第9至13天测量每日总产热（THP），并在第14天禁食以评估其禁食产热（FHP）。结果表明，随着日粮脂质含量增加，中性洗涤纤维（线性，P = 0.09）和酸性洗涤纤维（线性，P = 0.07）的表观全肠道消化率呈下降趋势。三种日粮的平均THP分别为1326、1208和1193 kJ/kg BW/天。猪的FHP平均为843 kJ/kg BW/天，不受日粮特性影响。观察到随着SBO添加水平增加，采食状态下的呼吸商降低。总之，通过间接测热法测定的SBO在两种添加水平下的NE值分别为33.45和34.05 MJ/千克干物质。在饲料中添加SBO可大幅降低THP，但玉米-豆粕日粮中5% SBO的THP与10% SBO的THP无差异。
