Institute of Ensiling and Processing of Grass, Nanjing Agricultural University, Nanjing, China.
J Sci Food Agric. 2018 Sep;98(12):4462-4470. doi: 10.1002/jsfa.8970. Epub 2018 May 17.
A laboratory-silo study was conducted to evaluate the fermentation quality, feed-nutritive value and aerobic stability of sweet sorghum silage with or without oil-extracted microalgae supplementation. Sweet sorghum was mixed with four microalgae levels (0%, 1%, 2% and 3% on a dry matter basis; control, M1, M2 and M3, respectively) and ensiled for 45 d. Further, the four experimental silages were subjected to an aerobic stability test lasting 7 d.
All the silages except M3 silage had good fermentative characteristics with low pH and ammonia nitrogen concentrations, and high lactic acid concentrations and favorable microbial parameters. Meanwhile, oil-extracted microalgae supplementation improved the feed-nutritional value of sweet sorghum silage. Fibre (neutral detergent fibre, acid detergent fibre, acid detergent lignin and cellulose) concentrations decreased, while dry matter and crude protein levels markedly increased (P < 0.05). Compared with the control (69.7 h), treatments M2 and M3 improved the aerobic stability of sweet sorghum silage by 43.8% and more than 143% respectively, and decreased the clostridia spore counts during the stage of air exposure.
Sweet sorghum silage produced with 2% oil-extracted microalgae addition was the most suitable for animal use due to the optimal balance of fermentation quality, feed-nutritional value and aerobic stability, which merits further in vivo studies using grazing ruminants. © 2018 Society of Chemical Industry.
进行了一项实验室青贮研究，以评估添加或不添加已提取油脂的微藻对甜高粱青贮的发酵品质、饲料营养价值和有氧稳定性的影响。将甜高粱与四种微藻水平（0%、1%、2%和 3%，均以干物质为基础；对照、M1、M2 和 M3）混合并青贮 45 天。此外，将这四种实验青贮进行为期 7 天的有氧稳定性测试。
除了 M3 青贮外，所有青贮都具有良好的发酵特性，其 pH 和氨氮浓度较低，乳酸浓度较高，微生物参数良好。同时，添加已提取油脂的微藻提高了甜高粱青贮的饲料营养价值。纤维（中性洗涤纤维、酸性洗涤纤维、酸性洗涤木质素和纤维素）浓度降低，而干物质和粗蛋白水平显著增加（P<0.05）。与对照（69.7 h）相比，处理 M2 和 M3 分别将甜高粱青贮的有氧稳定性提高了 43.8%和 143%以上，并减少了在暴露于空气过程中的梭菌孢子数。
由于发酵品质、饲料营养价值和有氧稳定性之间的最佳平衡，添加 2%已提取油脂的微藻生产的甜高粱青贮最适合动物使用，值得进一步用放牧反刍动物进行体内研究。 © 2018 英国化学学会。
