Abstract
Simple SummaryThe effects of dietary hydrolyzed Chinese gallnut tannic acid (GCT) as a replacement for ZnO were investigated on weaned piglets. A total of 72 piglets (31 ± 1 day) were selected and divided randomly into two groups: a control group, with a basal diet of + 1600 mg/kg ZnO; and a treated group, with a basal diet of + 1899.5 mg/kg GCT. The diarrhea rate of piglets in the treated group declined on days 14–21 than in the control group. Additionally, we found GCT can reduce the crypt depth of the ileum and improve antioxidant capacity. High throughput sequencing showed that the GCT increased the richness of bacteria (Lachnospiraceae, Prevotella, and Lactobacillus amylovorus) associated with the degradation of cellulose and hemicellulose. These data indicate that 1899.5 mg/kg GCT could be an alternative for 1600 mg/kg ZnO in the diet of piglets.The effects of dietary hydrolyzed Chinese gallnut tannic acid(GCT) as a replacement for ZnO were investigated on weaned piglets. A total of 72 weaned piglets at 31 ± 1 day (six replicate pens per treatment with six piglets per pen) were selected and divided randomly into two groups: a control group, with a basal diet of + 1600 mg/kg ZnO; and a treated group, with a basal diet of + 1899.5 mg/kg GCT. Data analysis showed that the significance of average daily gain and average daily feed intake between the two groups was p = 0.731 and p = 0.799, respectively. Compared with the control group, the diarrhea rate of piglets in the treated group underwent no noticeable change on days 0–7 (p = 0.383) and 7–14 (p = 0.263), but decreased significantly on days 14–21 (p < 0.05). Additionally, we found GCT can reduce the crypt depth of the ileum and improve its antioxidant capacity (p < 0.05). High throughput sequencing showed that GCT increased the richness of the bacteria Lachnospiraceae (p = 0.005), Prevotella_2 (p = 0.046) and Lactobacillus amylovorus (p = 0.081), which are associated with the degradation of cellulose and hemicellulose. The study indicated that 1899.5 mg/kg GCT could be an alternative for 1600 mg/kg ZnO in the diet of piglets.
Highlights
Seventy-two weaned piglets of 31 days old were randomly divided into two groups: (1) A control group, with a basal diet including + 1600 mg/kg ZnO; ZnO and premix were mixed into diet
Compared with the ZnO diet, the addition of GCT in their diet had no influence on the average daily feed intake (ADFI) (p = 0.799), average daily gain (ADG) (p = 0.731) and FCR of weaned piglets (p = 0.411)
The results show no influence on ADG, ADFI and FCR
Summary
Weaning can bring enormous stress to piglets, leading to a decline in piglet growth performance [1]. High doses of ZnO have been used to reduce the harm of weaning to piglets [2]. The demand for zinc in piglets is 80–100 mg/kg [3], and piglets cannot absorb zinc completely, which leads to a large amount of zinc discharged from the body, causing potential harm to the environment [4]. Announcement No.2625 of the Ministry of Agriculture of China stipulates that the maximum allowable concentration 4.0/). In 2017, the CVMP intends to prohibit the use of high-dose ZnO in piglets within 5 years. It is necessary to find a potential alternative to ZnO to maintain the normal growth of weaned piglets
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