Zhao Mengyu, Zhang Xiaoan, Chen Yao, Ren Chunhuan, Sun Yiming, Wang Penghui, Cheng Xiao, Zhang Zijun, Chen Jiahong, Huang Yafeng
College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China.
Center of Agriculture Technology Cooperation and Promotion of Dingyuan County, Chuzhou 233200, China.
Animals (Basel). 2023 Aug 16;13(16):2644. doi: 10.3390/ani13162644.
This study investigated the effects of three feeding systems, indoor feeding (CONT), indoor feeding with time-restricted grazing artificial pasture (4 h/day, G4H), and indoor feeding with an eight-hour daily grazing artificial pasture (G8H), on the growth performance, serum metabolites, ruminal fermentation, and fecal microbiota composition of lambs. Average daily gain showed a tendency ( = 0.081) to be higher for the G4H group compared with the CONT group. Moreover, feeding systems did not have a significant effect on most of the serum biochemical indicators in lambs. Concentrations of serum glutathione peroxidase and immunoglobulins (IgA, gG, and IgM) were significantly lower ( < 0.01) in the CONT group. Additionally, a tendency towards higher levels of volatile fatty acids, acetate, and butyrate was found in animals of the G4H group compared to the CONT group. Furthermore, fecal microbiota composition was altered in G4H and G8H groups, resulting in the increased relative abundance of and , as well as the decreased relative abundance of compared with the CONT group. Overall, these results suggest that indoor feeding with restricted grazing time does not significantly affect fattening performance or rumen fermentation but enhances antioxidation and immune function activity and also alters fecal microbiota composition.
本研究调查了三种饲养系统，即室内饲养（CONT）、限时放牧人工牧场的室内饲养（每天4小时，G4H）和每日8小时放牧人工牧场的室内饲养（G8H），对羔羊生长性能、血清代谢物、瘤胃发酵和粪便微生物群组成的影响。与CONT组相比，G4H组的平均日增重呈升高趋势（P = 0.081）。此外，饲养系统对羔羊的大多数血清生化指标没有显著影响。CONT组血清谷胱甘肽过氧化物酶和免疫球蛋白（IgA、IgG和IgM）的浓度显著较低（P < 0.01）。此外，与CONT组相比，G4H组动物的挥发性脂肪酸、乙酸盐和丁酸盐水平有升高趋势。此外，G4H组和G8H组的粪便微生物群组成发生了改变，与CONT组相比，导致普雷沃氏菌属和瘤胃球菌属的相对丰度增加，而拟杆菌属的相对丰度降低。总体而言，这些结果表明，限时放牧的室内饲养对育肥性能或瘤胃发酵没有显著影响，但增强了抗氧化和免疫功能活性，同时也改变了粪便微生物群组成。
