抗仔猪早期断奶应激（EWS）和断奶后应激性疾病的研究

A Study on Anti-EWS and Anti-WSD in Piglet ——Experimental Observation on the Effect of Fumaric Acid etc. on preventing WSD and the Influences of Them on the Weight Increase in Piglet

试验采用２８日龄断奶的大长杂种仔猪１４４头，分为４组每组３６头，Ⅰ组为对照，日粮中不加酸，Ⅱ、Ⅲ、Ⅳ组在断奶前１０ｄ和断奶后１０ｄ日粮中分别添加１．５％柠檬酸、１．５％富马酸和１．５％３３１复合酸，以观察对提高早期断奶仔猪抗应激能力和生产性能，以及防制或减少ＷＳＤ的效果。试验结果：（１）Ⅰ，Ⅱ，Ⅲ，Ⅳ组在断奶后试验期间（２８～５８日龄），ＷＳＤ发病率分别为７７．７７％，４４．４４％，２２．２２％和１６．６６％；死亡率分别为１３．８８％，８．３３％，５．５５％和５．５５％；存活率分别为８６．１２％，９１．６７％，９４．４５％和９４．４５％．结果表明，柠檬酸、富马酸和３３１复合酸都有抗应激和防制ＷＳＤ的效果，其中以富马酸和３３１复合酸效果最佳。（２）在断奶后试验期间，Ⅰ，Ⅱ，Ⅲ，Ⅳ组体重分别增重１０．５９ｋｇ，１１．３２ｋｇ，１２．１１ｋｇ和１２．９７ｋｇ，Ⅱ，Ⅲ，Ⅳ组比Ⅰ组分别增重６．８９％，１４．３５％和２２．４７％．结果表明，柠檬酸、富马酸和３３１复合酸都有酸化日粮、促进消化吸收和提高早期断奶后仔猪的生产性能，其中以３３１复合酸和富马酸效果最好。

In the test, we used 144 long big cross-bred piglets and divided them into four groups equally. We didn't put the acid in the daily feed of group Ⅰ. In the days before weaning and ten days after weaning of piglets. We put 1.5% citric acid, [ST5”BZ]1.5% fumaric acid and 1.5% 331 compound acid in the daily feed of group Ⅱ, Ⅲ and Ⅳ, respectively, so as to observe the effect of the three kinds of acid on improving the capacity of anti-EWS and breeding of piglet and preventing or decreasing WSD. The results were: (1) During the test after weaning of piglet ([ST5”BZ]28～58 days old), the incidences of WSD were 77.77%, [ST5”BZ]44.44%, 22.22% and 16.66%, respectively; the death rates were 13.88%, 8.33%, [ST5”BZ] 5.55% and 5.55%, respectively; living rates were 82.12%, 91.67%, 94.45% and [ST5”BZ]94.45%, respectively. This indicated that the three kinds of acid had the effect on anti-EWS and preventing WSD, and fumaric acid and 331 compound acid were better. (2) During the test after weaning of piglets, the weights of piglets increased 10.59kg, 11.32kg, 12.11kg and 12.97kg, respectively. The weights of group Ⅱ, Ⅲ and [WT5”BZ]Ⅳ, increased 6.89%, 14.35% and [ST5”BZ]22.47%, respectively, more than that of group Ⅰ. This indicated that the three kinds of acid could acidify the daily feed, make it more digestible and improve the breeding capacity of piglets after their early weaning, and 331 compound acid and fumaric acid were better.