This study was aimed to explore the effect of using cassava as an amylopectin source in low protein (LP) diets on growth performance, nitrogen efficiency, and postprandial changes in plasma glucose and related hormones concentrations of growing pigs. Three animal experiments were included in the present study. Treatments included corn-soybean meal LP (Corn LP), corn-cassava-soybean meal LP (Corn + Cassava LP), and cassava-soybean meal LP (Cassava LP). The in vitro digestion proved that Corn + Cassava LP and Cassava LP diets induced more rapid starch digestion and glucose release, compared with Corn LP diet. The results of animal experiments are as follows: Cassava LP diet caused the most rapid changes in plasma glucose and relevant hormones concentrations after a meal. It decreased the concentrations of fasting plasma insulin, glucagon, and leptin concentrations compared with other treatments (P < 0.05). These modulations above led to a strong desire to eat and increased feed intake and then weight gain in growing pigs fed Cassava LP diet. Besides, feeding Cassava LP diet caused diarrhea, increased noxious gas release from feces, and increased concentrations of fecal isobutyrate and isovalerate (P < 0.05). Compared with Corn LP group, Corn + Cassava LP group showed significantly decreased urinary nitrogen (P < 0.05) and improved post-absorptive amino acid utilization efficiency. In conclusion, the use of cassava as an amylopectin source in LP diets could modulate glucose absorption and related gut secreted hormones secretion, subsequently strengthened the desire to eat, improved growth performance, and enhanced nitrogen efficiency in growing pigs.

中文翻译：

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在低蛋白日粮中使用木薯作为支链淀粉来源对生长猪生长性能、氮效率以及餐后血糖和相关激素浓度变化的影响


本研究旨在探讨在低蛋白（LP）日粮中使用木薯作为支链淀粉来源对生长猪生长性能、氮效率以及餐后血糖和相关激素浓度变化的影响。本研究包括三个动物实验。处理包括玉米-豆粕LP (Corn LP)、玉米-木薯-豆粕LP (Corn + Cassava LP)和木薯-豆粕LP (Cassava LP)。体外消化证明，与玉米LP饮食相比，玉米+木薯LP饮食和木薯LP饮食诱导更快速的淀粉消化和葡萄糖释放。动物实验结果如下：木薯LP饮食引起餐后血浆葡萄糖和相关激素浓度的变化最快。与其他治疗相比，它降低了空腹血浆胰岛素、胰高血糖素和瘦素浓度（P< 0.05）。上述这些调节导致饲喂木薯 LP 日粮的生长猪产生强烈的进食欲望并增加采食量，进而增加体重。此外，饲喂木薯LP饲料会导致腹泻、粪便中有害气体释放增加以及粪便异丁酸和异戊酸浓度增加（P < 0.05）。与玉米LP组相比，玉米+木薯LP组尿氮显着降低（P< 0.05），吸收后氨基酸利用率提高。总之，在LP日粮中使用木薯作为支链淀粉来源可以调节葡萄糖吸收和相关肠道分泌激素的分泌，从而增强生长猪的进食欲望，改善生长性能并提高氮效率。