Abstract
AbstractThe objective of this study is to evaluate the effects of tannic acid (TA) derived from gallnut supplementation on growth performance and health status of weaned piglets. A total of 432 weanling piglets (7.05 ± 1.05 kg) were randomly allocated into 4 treatment groups with 6 replicates of 18 pigs/pen. Piglets were fed either a basal diet (CON), or basal diets supplemented with 1.5 kg/t TA, 3.0 kg/t TA, or 1.8 kg/t zinc oxide (ZnO) for 21 days. The results showed that, compared to the CON, dietary TA supplementation did not affect (p > 0.05) growth performance and serum biochemistry of weaned piglets. However, 3.0 kg/t TA had higher SOD, GPX, and CAT activities and a lower MDA concentration in the jejunum than those of the CON or the ZnO group. Meanwhile, 3.0 kg/t TA increased (p < 0.05) villus height and villus height/crypt depth, and decreased (p < 0.05) crypt depth in the small intestine. Dietary TA also downregulated (p < 0.05) IL‐1β and TNF‐α expression in jejunum. Furthermore, 3.0 kg/t TA reduced (p < 0.05) the abundance of Candidatus Brocadia and Escherichia‐Shigella in cecal digesta. Notably, both Candidatus Brocadia and Escherichia‐Shigella had a negative correlation with antioxidant enzymes activities (R < −0.60, p < 0.01), but Escherichia‐Shigella was positively correlated with MDA concentrations (R = 0.44, p < 0.05) in the jejunum. In conclusion, compared to the CON, 3.0 kg/t TA supplementation improved the gut health status of weaned piglets, potentially by regulating redox homeostasis and gut microbiota.
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