Dietary fiber and zinc additives on performance and intestinal health of Escherichia coli challenged piglets

ABSTRACT This study aimed to evaluate the effects of zinc oxide and a low level of encapsulated zinc oxide, with or without dietary fiber, on the performance and intestinal health of weaned piglets. A total of 112 piglets were used, divided into four treatment groups: basal diet with zinc oxide (ZnO); basal diet with zinc oxide and dietary fiber (ZnO+DF); basal diet with encapsulated low zinc oxide (LZnOE); and basal diet with LZnOE and DF (LZnOE+DF). Piglets were challenged with E . coli K88 + , weighed weekly and the fecal score was evaluated daily. One pig per pen was slaughtered to evaluate the production of volatile fatty acids, intestinal microbial populations, intestinal morphology, and digestibility. The encapsulated zinc resulted in lower body weight and average daily gain, but, when associated with dietary fiber, had similar results to zinc oxide. Until 49 days of age, zinc oxide reduced diarrhoea ( p < 0.05). At 63 days of age the piglets subjected to LZnOE+DF treatment had lower diarrhoea than the pigs subjected to LZnOE treatment but higher than the ZnO and the ZnO+DF groups. Final weight and incidence of diarrhoea of pigs receiving LZnOE was worse than ZnO. LZnOE associated with DF provided the same final weight of piglets from the ZnO group.

摘要 本研究旨在评估氧化锌（zinc oxide, ZnO）、低剂量包被氧化锌（encapsulated low zinc oxide, LZnOE），配合或不配合膳食纤维（dietary fiber, DF），对断奶仔猪生产性能与肠道健康的影响。试验共纳入112头断奶仔猪，随机分为4个处理组：基础日粮添加氧化锌（ZnO）组、基础日粮添加氧化锌与膳食纤维组（ZnO+DF）、基础日粮添加包被低剂量氧化锌组（LZnOE）、基础日粮添加包被低剂量氧化锌与膳食纤维组（LZnOE+DF）。仔猪经大肠杆菌K88+（E. coli K88+）攻毒后，每周称重1次，每日评估粪便评分。每栏选取1头仔猪进行屠宰，检测其挥发性脂肪酸生成量、肠道微生物菌群、肠道形态学指标及养分消化率。研究结果表明，包被低剂量氧化锌会降低仔猪的体重与平均日增重，但当其与膳食纤维联用时，其效果与氧化锌组相当。至49日龄时，氧化锌可显著降低仔猪腹泻率（p<0.05）。至63日龄时，LZnOE+DF组仔猪的腹泻发生率低于LZnOE组，但高于ZnO组与ZnO+DF组。饲喂LZnOE组仔猪的终末体重与腹泻发生率均劣于ZnO组。LZnOE与膳食纤维联用时，可达到与ZnO组一致的仔猪终末体重。