复合植物藻类提取物替代氧化锌对断奶仔猪生长性能、肠道发育及免疫指标的影响

Effect of compound plant and algae extracts instead of zinc oxide on growth performance,intestinal development and immunological indices of weaned piglets

试验旨在研究复合植物藻类提取物(CPAE)(含海带、番薯、盐肤木)替代氧化锌(ZnO)对断奶仔猪生长性能、肠道发育以及机体免疫指标的影响。选取28日龄体重为(8.20±1.78)kg的“长×大”二元第一胎断奶仔猪24头,随机分为2组,每组6个重复,每个重复2头猪。ZnO组在基础日粮中额外添加2 kg/t的ZnO,CPAE组在基础日粮中添加1 kg/t的CPAE,不额外添加ZnO。试验期14 d。结果显示:与ZnO组相比,CPAE组断奶仔猪的平均日增重、平均日采食量、料重比及粗蛋白、粗脂肪的表观消化率、腹泻率均无显著差异(P>0.05),十二指肠的绒毛高度和绒隐比显著提高(P<0.05)断奶仔猪血清中免疫球蛋白A(IgA)和免疫球蛋白G(IgG)含量极显著提高(P<0.01),碱性磷酸酶(ALP)和谷丙转氨酶(ALT)活性极显著降低(P<0.01)。研究表明,CPAE可替代ZnO在抗腹泻、促生长和维护肠道黏膜屏障方面起到类似效果。

The experiment was conducted to study the effect of CPAE(including kelp, sweet potato and rhus salt)replacing ZnO on growth performance, diarrhea, intestinal development and immune function of weaned piglets. Twentyfour 28-day-old ’Landrace × Yorkshire’ first-born weaned piglets with the body weight of(8.20±1.78) kg were randomly divided into two groups with six replicates in each group and two piglets in each replicate. The ZnO group was fed the basal diet supplemented with an additional 2 kg/t ZnO, and the CPAE group was fed the basal diet supplemented with 1 kg/t CPAE without additional ZnO. The experiment lasted for 14 d. The results showed that compared with ZnO group, there were no significant differences in average daily gain, average daily feed intake, feed to gain ratio and digestibility of crude protein and ether extract of weaned piglets in CPAE group(P>0.05). Dietary CPAE had no effect on diarrhea rate of weaned piglets(P>0.05), but significantly increased villus height and villus crypto-ratio of duodenum(P<0.05). In CPAE group, IgA and IgG content of weaned piglets were significantly increased(P<0.01), and ALP and ALT activity of weaned piglets were significantly decreased(P<0.01). The experiment indicates that the substitution of ZnO by CPAE has similar effects in anti-diarrhea, growth promotion and maintenance of intestinal mucosal barrier.