Department of Animal Production, College of Food and Agriculture Sciences, King Saud University, Riyadh 11451, Saudi Arabia.
Department of Nutrition and Clinical Nutrition, Faculty of Veterinary Medicine, Kafrelsheikh University, Kafrelsheikh 33516, Egypt.
Animal. 2019 Oct;13(10):2252-2259. doi: 10.1017/S1751731119000296. Epub 2019 Mar 1.
Controlling rumen fermentation using buffering agents could contribute to enhancing ruminant productivity and performance. This study was realized to investigate the effect of dietary supplementation of AcidBuf, sodium bicarbonate, calseapowder and WMC seaweed (Utva Lactuca extra) on the animal performance, volatile fatty acids, rumen pH, rumen histology and carcass characteristics of growing male Awassi lambs. A total of 60 lambs was divided into five groups. One group served as a control and fed only on a concentrate diet without any buffering, whereas the other four groups were fed the concentrate diet supplemented with 0.4% AcidBuf (Buf1), 0.4% AcidBuf plus sodium bicarbonate, 50 : 50 (Buf2), 0.4% calseapowder (Buf3) or 0.4% WMC Seaweed (Buf4) for 98 days. The feed conversion ratio was (P<0.05) improved in Buf2 compared to the control and other treatment groups. The propionic acid decreased, whereas butyric acid was increased in the treatment groups (P<0.05) compared to the control. The pH of the rumen fluid and the length of submucosa were (P<0.05) higher in Buf4 and Buf1, respectively, compared to the control. Hot and cold carcass weights were (P<0.05) higher in Buf4 compared to Buf1. Lean meat percentage and rib eye area were (P<0.05) higher in Buf4; while the fat percentage was (P<0.05) lower in Buf2 and Buf4 groups compared to the control. The lightness and yellowness of meat were (P<0.05) higher in Buf1 and Buf4 compared to the control. The meat pH was (P<0.05) higher in Buf3 and Buf4 compared to Buf2 (at 1 h) and control (at 24 h). The visceral depot fat (%) was reduced with Buf3 and Buf4 compared to the control. The results indicated that dietary supplementation of different buffering agents improved feed efficiency, rumen pH, carcass characteristics and decreased the body fat in growing Awassi lambs.
使用缓冲剂控制瘤胃发酵可以提高反刍动物的生产力和性能。本研究旨在探讨日粮中添加 AcidBuf、碳酸氢钠、碳酸钙粉和 WMC 海藻（Utva Lactuca extra）对生长雄性 Awassi 羔羊的动物性能、挥发性脂肪酸、瘤胃 pH、瘤胃组织学和胴体特性的影响。共有 60 只羔羊被分为五组。一组作为对照组，仅喂食不含任何缓冲剂的浓缩饲料，而其余四组则喂食添加 0.4% AcidBuf（Buf1）、0.4% AcidBuf 加碳酸氢钠、50:50（Buf2）、0.4%碳酸钙粉（Buf3）或 0.4%WMC 海藻（Buf4）的浓缩饲料，共 98 天。与对照组和其他处理组相比，Buf2 的饲料转化率（P<0.05）得到改善。与对照组相比，处理组丙酸减少，丁酸增加（P<0.05）。与对照组相比，Buf4 和 Buf1 组的瘤胃液 pH 和黏膜下层长度分别（P<0.05）升高。热胴体重和冷胴体重在 Buf4 组分别高于 Buf1 组（P<0.05）。瘦肉类百分比和眼肌面积在 Buf4 组更高（P<0.05），而脂肪百分比在 Buf2 和 Buf4 组低于对照组（P<0.05）。与对照组相比，Buf1 和 Buf4 组的肉色亮度和黄度更高（P<0.05）。与 Buf2 和对照组相比，Buf3 和 Buf4 组的肉 pH 值更高（P<0.05）。Buf3 和 Buf4 组内脏脂肪（%）较对照组减少。结果表明，日粮中添加不同的缓冲剂可以提高饲料效率、瘤胃 pH、胴体特性，并降低生长 Awassi 羔羊的体脂肪。
