Gultepe Eyup Eren, Uyarlar Cangir, Cetingul Ibrahim Sadi, Iqbal Aamir, Ozcinar Umit, Bayram Ismail, Bradford Barry J
Department of Animal Nutrition and Nutritional Diseases, Faculty of Veterinary Medicine, Afyon Kocatepe University, 03200, Afyonkarahisar, Turkey.
Department of Animal Sciences and Industry, Kansas State University, Manhattan, KS, USA.
Trop Anim Health Prod. 2020 Jul;52(4):2063-2071. doi: 10.1007/s11250-020-02233-6. Epub 2020 Feb 6.
This experiment evaluated the ruminal digestibility of Turkish oregano leaves in dairy buffalo and cows. Ruminally cannulated, multiparous Brown Swiss cows (n = 3) and water buffalo (Bubalus bubalis; n = 3) were used in the experiment. The ad libitum basal diet was balanced to NRC requirements for a dry, nonpregnant multiparous dairy cow (680 kg) and consuming 12.8 kg of DM/day. Air-dried, ground, weighed oregano leaves were inserted in the rumen of all animals before the morning feeding within heat-sealed nylon bags (4 replicates per treatment and time point). After incubation (4, 8, 24, 48, and 72 h), dry matter (DM), crude protein (CP), aNDFom, and ADFom concentrations were determined and compared to initial leaf chemical composition. The means for in situ disappearance (ISD, %) of DM, aNDFom, and ADFom did not differ between the species, but ISD of CP was greater in buffalo than the cows (P = 0.05) after 72 h incubation. The lag time of kinetic degradation curves, the potentially degradable fraction (b), hourly degradation rate (c), and undegradable fraction were similar between species. The immediately degraded fraction (a) and effective digestibility (ED) of CP were greater in buffalo than the cows (P = 0.04), but the a fraction and ED of other nutrients showed no differences between the species. In conclusion, CP of oregano leaves are degraded more rapidly in the rumen of dairy buffalo than cows, primarily due to a large difference in the rapidly soluble CP fraction in the buffalo.
本实验评估了土耳其牛至叶在奶水牛和奶牛瘤胃中的消化率。实验采用了瘤胃插管的经产瑞士褐牛（n = 3）和水牛（Bubalus bubalis；n = 3）。随意采食的基础日粮根据非妊娠经产干奶牛（680千克）且日采食量为12.8千克干物质的美国国家研究委员会（NRC）要求进行配制。在早晨饲喂前，将风干、研磨并称重的牛至叶装入热封尼龙袋中插入所有动物的瘤胃（每个处理和时间点4个重复）。培养（4、8、24、48和72小时）后，测定干物质（DM）、粗蛋白（CP）、中性洗涤纤维（aNDFom）和酸性洗涤纤维（ADFom）浓度，并与初始叶片化学成分进行比较。培养72小时后，DM、aNDFom和ADFom的原位消失率（ISD，%）在两个物种间无差异，但水牛CP的ISD高于奶牛（P = 0.05）。物种间动力学降解曲线的滞后时间、潜在可降解部分（b）、每小时降解率（c）和不可降解部分相似。水牛CP的快速降解部分（a）和有效消化率（ED）高于奶牛（P = 0.04），但其他养分的a部分和ED在物种间无差异。总之，牛至叶的CP在奶水牛瘤胃中的降解速度比奶牛更快，主要是由于水牛瘤胃中快速可溶CP部分存在较大差异。
