ABSTRACT The current experiment was designed to examine effects of dietary supplemental sunflower hulls (SH) and rice hulls (RH) on growth performance, carcass traits, intestinal morphology, lesion score and oocyst shedding in broiler chickens exposed to coccidial challenge. A total of 540 broiler chickens (Ross 308) were assigned to six dietary treatments based on a factorial arrangement (2 × 3) across 1–14, 14–28 and 28-42-d periods. Experimental treatments consisted of broiler chickens without or with coccidial challenge each offered with three different diets: a basal diet or basal diet supplemented with either RH or SH at 40 g/kg diet, respectively. Infection with Eimeria impaired daily weight gain (DWG) and feed conversion ratio (FCR) of broiler chickens during growing period (p < 0.05) while supplementation of SH or RH reduced the adverse effect of coccidiosis so that birds had similar DWG to those fed the basal diet without infection. However, only dietary SH improved the FCR of broilers challenged with coccidiosis. Regardless of coccidial challenge, dietary access to insoluble fibre improved performance of broilers across the growing period (p < 0.05); however, this effect was not observed during the entire rearing period. Relative weights of liver and pancreas were increased in birds subjected to coccidial challenge on d 21 of age (p < 0.05). Moreover, relative weights of the intestinal segments were enhanced (p < 0.05). Furthermore, gizzard weights were higher in birds receiving diets added with fibre (p < 0.05). Infection with coccidiosis decreased villus height and villus height to crypt depth ratio in duodenum of broilers which received the basal diet compared with those fed the same feed without coccidial challenge (p < 0.05). However, supplemental SH could decrease the negative effect of infection on the noted intestinal morphometric attributes. Similarly, a marked reduction was observed for lesion score and faecal oocyst excretion of challenged broilers fed on dietary supplemental fibre (p < 0.05). In conclusion, supplementation of insoluble fibre could ameliorate negative effects of coccidial challenge on DWG of broiler chickens and inclusion of SH in diet of birds exposed to Eimeria infection could be recommended.

中文翻译：

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日粮中添加不溶性纤维材料改善肉鸡球虫攻击不良反应的效果

摘要 本实验旨在检测日粮中添加向日葵壳 (SH) 和稻壳 (RH) 对暴露于球虫攻击的肉鸡的生长性能、胴体性状、肠道形态、病变评分和卵囊脱落的影响。根据跨 1-14、14-28 和 28-42 天的阶乘安排 (2 × 3)，总共 540 只肉鸡 (Ross 308) 被分配到六种日粮处理。实验处理包括没有或有球虫攻击的肉鸡，每只鸡提供三种不同的饮食：基础饮食或基础饮食分别补充 40 g/kg 的 RH 或 SH。艾美球虫感染会影响肉鸡在生长期的日增重 (DWG) 和饲料转化率 (FCR) (p < 0. 05) 同时补充 SH 或 RH 减少了球虫病的不利影响，因此鸡只具有与那些喂食基础日粮而没有感染的鸡相似的 DWG。然而，只有日粮 SH 提高了感染球虫病的肉鸡的 FCR。不管球虫的挑战如何，日粮中不溶性纤维的摄入改善了肉鸡在整个生长期的生产性能（p < 0.05）；然而，在整个饲养期间都没有观察到这种效果。在第 21 天接受球虫攻击的鸟类中，肝脏和胰腺的相对重量增加（p < 0.05）。此外，肠段的相对重量增加（p < 0.05）。此外，接受添加纤维的日粮的鸡的胼胝重量更高（p < 0.05）。与饲喂相同饲料而未进行球虫攻击的肉鸡相比，球虫病感染降低了接受基础日粮的肉鸡十二指肠的绒毛高度和绒毛高度与隐窝深度之比（p < 0.05）。然而，补充 SH 可以减少感染对肠道形态测量属性的负面影响。类似地，观察到以膳食补充纤维喂养的受攻击肉鸡的病变评分和粪便卵囊排泄量显着降低（p < 0.05）。总之，补充不溶性纤维可以改善球虫攻击对肉鸡 DWG 的负面影响，并且可以推荐在暴露于艾美球虫感染的鸟类的饮食中加入 SH。然而，补充 SH 可以减少感染对肠道形态测量属性的负面影响。类似地，观察到以膳食补充纤维喂养的受攻击肉鸡的病变评分和粪便卵囊排泄量显着降低（p < 0.05）。总之，补充不溶性纤维可以改善球虫攻击对肉鸡 DWG 的负面影响，并且可以推荐在暴露于艾美球虫感染的鸟类的饮食中加入 SH。然而，补充 SH 可以减少感染对肠道形态测量属性的负面影响。类似地，观察到以膳食补充纤维喂养的受攻击肉鸡的病变评分和粪便卵囊排泄量显着降低（p < 0.05）。总之，补充不溶性纤维可以改善球虫攻击对肉鸡 DWG 的负面影响，并且可以推荐在暴露于艾美球虫感染的鸟类的饮食中加入 SH。