This experiment was conducted to investigate the effects of dietary supplementation with coated granules (CG) on performance, in vitro digestibility and the gastrointestinal functionality in laying hens. A total of 40 Hisex Brown laying hens (36 weeks of age) were randomly divided into five equal groups; one served as a control and the other four were actual experimental groups supplemented with 0.75, 1.5, 3 or 6 g CG per day. All the hens were fed restrictively with target feed intake of 100 g basal diet/hen per day. There were no differences in egg production or egg weight among the groups, but feed conversion ratio was significantly improved (linearly, p < 0.05) with the dose level of CG in diet. Dietary CG increased the jejunal weight (linear and quadratic terms, p < 0.05) but decreased the ileal weight (linearly, p < 0.05). There was mostly statistical interaction between dietary CG and specific activity of intestinal digestive enzymes with similar patterns for dietary CG treatments (p < 0.05). A positive linear correlation was observed with in vitro protein digestibility by using the crude enzyme extract from dietary CG supplementation. Dietary CG decreased the caecal Escherichia coli population while the Lactobacillus spp.: E. coli ratio increased (quadratic fit, p < 0.05). CG supplementation, on the other hand, significantly altered intestinal morphology by increasing the height of duodenal and ileal villi (linearly, p < 0.05). Also, duodenal antioxidant capacity observed via remaining reducing power improved linearly (p < 0.05). This suggests that CG, unlike garlic oils without encapsulation, may be a good candidate for feed supplementation in commercial egg production. It could be included up to 6 g CG per day without any adverse effects on performance, which may relate to improving nutrient digestibility and better utilization of limited feed intake when using a low amount of diet or other observations in this study.

中文翻译：

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含大蒜油二烯丙基二硫化物和二烯丙基三硫化物的日粮包衣颗粒对蛋鸡生产性能、体外消化率和胃肠功能的影响

本实验旨在研究日粮添加包衣颗粒 (CG) 对蛋鸡生产性能、体外消化率和胃肠功能的影响。将总共​​40只Hisex Brown蛋鸡（36周龄）随机分成5个相等的组；一个作为对照，另外四个是实际的实验组，每天补充 0.75、1.5、3 或 6 g CG。所有母鸡均限制饲喂，目标采食量为 100 g 基础日粮/母鸡/天。各组产蛋量或蛋重无差异，但饲料转化率随日粮中 CG 剂量水平的增加而显着提高（线性， p  < 0.05）。膳食 CG 增加了空肠重量（线性和二次项，p < 0.05）但回肠重量降低（线性，p  < 0.05）。饮食 CG 与肠道消化酶比活性之间主要存在统计学交互作用，饮食 CG 处理的模式相似（p  < 0.05）。通过使用来自膳食 CG 补充剂的粗酶提取物，观察到与体外蛋白质消化率呈正线性相关。膳食 CG 减少了盲肠大肠杆菌的数量，而乳杆菌属：大肠杆菌。 大肠杆菌比率增加（二次拟合，p < 0.05)。另一方面，补充 CG 通过增加十二指肠和回肠绒毛的高度来显着改变肠道形态（线性，p  < 0.05）。此外，通过剩余还原力观察到的十二指肠抗氧化能力呈线性提高（p  < 0.05）。这表明，与没有包封的大蒜油不同，CG 可能是商业鸡蛋生产中饲料补充剂的良好候选者。每天最多可以添加 6 克 CG，而不会对生产性能产生任何不利影响，这可能与在本研究中使用少量日粮或其他观察结果时提高营养消化率和更好地利用有限的采食量有关。