苯甲酸对断奶仔猪生长性能、器官指数和胃肠道内容物 pH的影响

摘要

本试验旨在研究苯甲酸对断奶仔猪生长性能、器官指数及胃肠道内容物pH的影响。选用72头28日龄仔猪随机分为2个组，每个组12个重复，每个重复3头仔猪。对照组饲喂基础饲粮，试验组饲喂在基础饲粮添加5000 mg/kg苯甲酸的试验饲粮，试验期为42 d。结果表明：1)与对照组相比，苯甲酸显著或极显著提高了仔猪第28天( P<0.05)和第42天( P<0.01)的体重，极显著提高了仔猪在第15~28天、第29~42天和第1~42天的平均日增重(P<0.01)，显著降低了仔猪在第15~28天、第29~42天和第1~42天的料重比( P<0.05)。2)与对照组相比，苯甲酸显著提高了第14、42天仔猪血清球蛋白和免疫球蛋白G的含量( P<0.05)；显著降低了第14、42天血清尿素氮含量( P<0.05)。3)与对照组相比，苯甲酸显著提高了第14、42天仔猪小肠、胸腺和脾脏指数( P<0.05)。4)与对照组相比，苯甲酸显著或极显著降低了第14、42天仔猪胃和结肠内容物( P<0.05)及第42天尿液的pH( P<0.01)。综上，饲粮中添加5000 mg/kg苯甲酸能够降低仔猪胃肠道内容物pH、提高免疫器官指数、改善血清生化指标和提高断奶仔猪的生长性能。%The objective of this experiment was to study the effects of benzoic acid on growth performance, or-gan indexes and gastrointestinal content pH of weaned piglets. A total of 72 weaned piglets aged 28 days were randomly divided into 2 groups with 12 replicates per group and 3 piglets per replicate. Pigs in control group were fed a basal diet, and the others in benzoic acid group were fed the basal diet supplemented with 5 000 mg/kg benzoic acid. The experiment lasted for 42 days. The results showed as follows: 1 ) the body-weight of piglets in benzoic acid group on day 28 and 42 was significantly higher than that in the control group (P<0.05 and P<0.01, respectively); compared with the control group, the ratio of feed to gain in benzoic acid group was significantly decreased ( P<0.05) , and the average daily gain was significantly increased from day 15 to day 28, day 29 to day 42 and day 1 to day 42 ( P<0.01) . 2) Compared with the control group, the contents of serum globulin and the immunoglobulin G in the benzoic acid group on day 14 and 42 were signifi-cantly increased ( P<0.05) , and the serum urea nitrogen content on day 14 and 42 was significantly decreased ( P<0.05) . 3) The small intestinal, spleen and thymus indexes in the benzoic acid group on day 14 and 42 were significantly higher than those in the control group ( P<0.05) . 4) The benzoic acid group significantly re-duced the pH in stomach and colon contents on day 14 and 42 ( P<0.05) , and the pH in urine on day 42 ( P<0.01) . In conclusion, supplementation with 5 000 mg/kg benzoic acid in the diet can reduce the gastrointesti-nal content pH, increase the immune organ indexes and improve the serum biochemical parameters, and then enhance the growth performance of weaned piglets.