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To explore the feasibility of using fermented Chinese herbal mixture  Zhihuasi Tk  ( Z. Tk ) supplementation to increase the swine production, the protective effect of dietary supplementation with  Z. Tk  on the intestinal oxidative stress model and the regulation of both growth performance and intestinal microbiota of weaned piglets were investigated  in vitro . Our results showed that the addition of  Z. Tk  increased the cell viability, prevented the decrease of glutathione peroxidase, and significantly increased the total antioxidant capacity and reduced the damage caused by H 2 O 2  to the tight junction proteins of the porcine small intestinal epithelial cell line (IPEC-J2). Furthermore, weaned piglets supplemented with either 2 kg/ton zinc oxide (ZnO) or 4 kg/ton of  Z. Tk  in the diet increased body weight as well as average daily feed intake and daily gain, while the feed conversion rate and diarrhea rate decreased within 0–35 days. Results of the taxonomic structure of the intestinal microbiota showed that, in 21 days after weaning, the Firmicutes/Bacteroidetes ratio in experimental group was increased, while the abundance of beneficial bacteria such, as  Lactobacillus , was increased by  Z. Tk , showing inhibitory effect on pathogenic bacteria such as members of Proteobacteria. In summary, dietary supplementation with  Z. Tk  maintained the intestinal microbiota in a favorable state for the host to effectively reduce the abnormal changes in the intestinal microbial structure and improved growth performance of weaned piglets. Therefore,  Z. Tk  may potentially function as a substitute for ZnO in feed additives for weaned piglets in modern husbandry.

Mixture of Five Fermented Herbs (Zhihuasi Tk) Alters the Intestinal Microbiota and Promotes the Growth Performance in Piglets