Institute of Animal Nutrition, Sichuan Agricultural University, Chengdu, China.
Anim Biotechnol. 2023 Nov;34(6):1900-1908. doi: 10.1080/10495398.2022.2058004. Epub 2022 May 6.
This study evaluated the effects of high concentrate diets (HCD) on the rumen fermentation and the digestibility of nutrients in different sites of the gastrointestinal tract (GIT) in goats. Four goats were used in a crossover design. The goats were fitted with a ruminal cannula and flexible T-cannulae proximal duodenum and terminal ileum. Treatments were as follows: low concentrate group (LCG) and high concentrate group (HCG). Duodenal flow and forestomach digestibility of starch were significantly higher in the HCG than those in the LCG (<0.05); There was no significant difference in ileum flow and digestibility of starch in the small intestine, large intestine and total GIT (>0.05). The digestibility of crude protein (CP) in the forestomach was significantly higher in the HCG than in the LCG (<0.05); the flow of the duodenum and ileum of CP, and the CP digestibility of the small intestine, large intestine and total GIT were not significantly different between groups (>0.05). The duodenal and ileal flow of neutral detergent fiber (NDF), the NDF digestibility of the different segments and total GIT were not significantly different between groups (>0.05). Compared to the LCG, the ruminal pH of the HCG was significantly lower (<0.05). The HCG concentrations of microbial crude protein, ammonia nitrogen and isovaleric acid were significantly higher (<0.05) than the LCG. The foam strength, foam production and viscosity of the rumen fluid in the HCG were higher than the LCG (<0.01). These results showed that when the goats were fed with HCD, the digestibility of nutrients was not significantly impaired, but the risk of frothy rumen bloat increased. ImplicationsDue to a serious shortage of high-quality roughage in China, producers commonly used a high-concentrate diet in ruminants, which can improve animal production performance.Gastrointestinal digestive function plays a vital role in the absorption of nutrients and the healthy growth of animals.Therefore, this research evaluated the digestibility of various nutrients in different segments of the gastrointestinal tract (GIT) under HCD feeding by using three-site cannula goats as experimental animals.The results indicated that the GIT of goats could fully digest nutrients such as starch and protein under HCD feeding conditions.
本研究评估了高浓度日粮（HCD）对山羊瘤胃发酵和胃肠道（GIT）不同部位养分消化率的影响。采用交叉设计，使用 4 只山羊。山羊装有瘤胃套管和近端十二指肠及回肠的柔性 T 型套管。处理如下：低浓度组（LCG）和高浓度组（HCG）。HCG 组十二指肠流量和前胃淀粉消化率显著高于 LCG 组（<0.05）；小肠、大肠和总 GIT 中淀粉的回肠流量和消化率无显著差异（>0.05）。HCG 组前胃粗蛋白（CP）消化率显著高于 LCG 组（<0.05）；十二指肠和回肠 CP 流量以及小肠、大肠和总 GIT CP 消化率无显著差异（>0.05）。中性洗涤纤维（NDF）的十二指肠和回肠流量，不同部位和总 GIT 的 NDF 消化率在各组之间无显著差异（>0.05）。与 LCG 相比，HCG 的瘤胃 pH 值显著降低（<0.05）。HCG 组微生物粗蛋白、氨氮和异戊酸浓度显著高于 LCG 组（<0.05）。HCG 组的瘤胃液泡沫强度、泡沫产量和粘度均高于 LCG 组（<0.01）。这些结果表明，当山羊饲喂 HCD 时，养分消化率没有受到显著影响，但泡沫瘤胃膨气的风险增加。
由于中国优质粗饲料严重短缺，生产者通常在反刍动物中使用高浓度日粮，这可以提高动物生产性能。胃肠道消化功能对动物的营养吸收和健康生长起着至关重要的作用。因此，本研究采用三部位套管山羊作为实验动物，评估了 HCD 喂养条件下不同胃肠道（GIT）部位的各种养分消化率。结果表明，在 HCD 喂养条件下，山羊的 GIT 可以充分消化淀粉和蛋白质等营养物质。
