Liaocheng Research Institute of Donkey High-Efficiency Breeding and Ecological Feeding, Liaocheng University, Liaocheng, China.
Liaocheng Research Institute of Donkey High-Efficiency Breeding and Ecological Feeding, Liaocheng University, Liaocheng, China.
J Equine Vet Sci. 2022 Mar;110:103864. doi: 10.1016/j.jevs.2022.103864. Epub 2022 Jan 10.
The present study was conducted to evaluate the in vitro dry matter disappearance (IVDMD) and fermentation characteristics of 6 fibrous feedstuffs incubated with donkey cecal or colic microorganisms. The fibrous feeds were corn straw, wheat straw, peanut vine, peanut shell, wheat shell and wheat bran (WB), which are commonly applied in large-scale donkey farms in China. After 48 hours fermentation, the highest IVDMD occurred in WB, and the lowest occurred in peanut shell (P < .05) regardless what inoculum applied. The IVDMD was positively correlated with OM (R = 0.42, P < .01), CP (R = 0.76, P < .01) and EE (R = 0.56, P < .01), while it was negatively correlated with NDF (R = 0.75, P < .01) and ADF (R = 0.79, P < .01). In terms of volatile fatty acids (VFAs), the greatest net VFA production also occurred in WB (P < .05). The acetate and branched-chain volatile fatty acid proportions were greater in the colon culture fluids than in caecum (P < .05), but the propionate proportions were lower in colon than in caecum (P < .05). This resulted in an increase in the ratio of acetate to propionate in colon culture fluids. In summary, based on the highest IVDMD, net VFA production and CP content occurring with the lowest contents of both NDF and ADF, WB had the highest nutritive value compared to other fibrous substrates. The extent of feed degradation and fermentation depended mainly on the nature of the incubated feedstuffs. Nevertheless, further study is required to investigate these fibrous feeds on hindgut fermentation and in vivo nutrient digestibility.
本研究旨在评估 6 种纤维性饲料在驴盲肠或结肠微生物作用下的体外干物质消失率（IVDMD）和发酵特性。这些纤维性饲料包括玉米秸秆、小麦秸秆、花生藤、花生壳、麦麸和麦糠（WB），在中国的大型驴养殖场中广泛应用。经过 48 小时发酵，无论使用哪种接种物，WB 的 IVDMD 最高，花生壳的 IVDMD 最低（P<0.05）。IVDMD 与 OM（R=0.42，P<0.01）、CP（R=0.76，P<0.01）和 EE（R=0.56，P<0.01）呈正相关，与 NDF（R=0.75，P<0.01）和 ADF（R=0.79，P<0.01）呈负相关。就挥发性脂肪酸（VFAs）而言，WB 的净 VFA 产量也最大（P<0.05）。结肠培养液中的乙酸和支链挥发性脂肪酸比例高于盲肠（P<0.05），但丙酸比例低于盲肠（P<0.05），导致结肠培养液中乙酸与丙酸的比例增加。综上所述，基于最高的 IVDMD、净 VFA 产量和 CP 含量，以及最低的 NDF 和 ADF 含量，WB 与其他纤维性底物相比具有最高的营养价值。饲料降解和发酵的程度主要取决于孵育饲料的性质。然而，需要进一步研究这些纤维性饲料在后肠发酵和体内养分消化率方面的情况。
