Parchami Milad, Rustas Bengt-Ove, Taherzadeh Mohammad J, Mahboubi Amir
Swedish Centre for Resource Recovery, University of Borås, 501 90 Borås, Sweden.
Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences, P.O. Box 7024, 750 07 Uppsala, Sweden.
Animals (Basel). 2024 Aug 12;14(16):2330. doi: 10.3390/ani14162330.
The growing demand for sustainable ruminant feed alternatives has motivated the application of bioconversion approaches for the valorization of agro-food byproducts (AFB) into feed additives and supplements. The present study thoroughly investigated substituting volatile fatty acids (VFAs) obtained from acidogenic fermentation (AF) of AFB as an energy source in ruminant feed. Rumen in vitro digestibility assays were conducted utilizing the gas production method, wherein the VFAs obtained from AF of apple pomace and potato protein liquor was substituted with partial silage and concentrate energy at levels of 10%, 20%, and 30%. The results indicate that substituting 20% of the concentrate's energy with VFA mixture significantly reduced methane production and had no adverse effect on the production and accumulation of VFAs in the simulated rumen media. Conversely, replacing 10% of the silage energy with VFAs led to a decrease in methane production and further enhanced the production of VFAs. Readily digestible VFAs in ruminant feed have the potential to enhance energy availability and sustainability in ruminant farming practices, aligning with the principles of circular economy and waste valorization.
对可持续反刍动物饲料替代品的需求不断增长，促使人们应用生物转化方法将农业食品副产品（AFB）转化为饲料添加剂和补充剂。本研究深入探讨了用AFB产酸发酵（AF）获得的挥发性脂肪酸（VFA）替代反刍动物饲料中的能源。利用产气法进行瘤胃体外消化率测定，其中用苹果渣和马铃薯蛋白液AF获得的VFA替代部分青贮饲料和精饲料能量，替代水平分别为10%、20%和30%。结果表明，用VFA混合物替代20%的精饲料能量可显著降低甲烷产量，且对模拟瘤胃介质中VFA的产生和积累没有不利影响。相反，用VFA替代10%的青贮饲料能量会导致甲烷产量下降，并进一步提高VFA的产量。反刍动物饲料中易消化的VFA有潜力提高反刍动物养殖实践中的能量利用率和可持续性，符合循环经济和废物资源化的原则。
