Sun Shengnan, Hou Zhenping, Dai Qiuzhong, Wu Duanqin
Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, China.
College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China.
Animals (Basel). 2019 Apr 18;9(4):177. doi: 10.3390/ani9040177.
The aim of this study was to investigate the effects of the forage type and chop length of ramie ( (L.) Gaud.) silage on rumen fermentation and ruminal microbiota in black goats. Sixteen Liuyang black goats (22.35 ± 2.16 kg) were fed with the roughage of corn silage or ramie silage at chop lengths of 1, 2, or 3 cm. The Chao 1 index and the observed number of microbial species differed significantly between the corn and ramie silage groups ( < 0.05); however, (relative proportion: 34.99-56.68%), (27.41-47.73%), and (1.44-3.92%) were the predominant phyla in both groups. The relative abundance of (0.32-0.82%) was lowest for the 2 and 3 cm chop lengths ( < 0.05) and was negatively correlated with rumen pH and propionic acid concentration ( < 0.05), but positively correlated with the ratio of acetic acid to propionic acid ( < 0.05). The ramie silage fermentation quality was highest for the 1 cm chop length, suggesting that moderate chopping produces optimal quality silage.
本研究旨在探讨苎麻（(L.) Gaud.）青贮饲料的类型和切碎长度对黑山羊瘤胃发酵及瘤胃微生物群的影响。选用16只浏阳黑山羊（体重22.35±2.16 kg），分别饲喂切碎长度为1、2或3 cm的玉米青贮粗饲料或苎麻青贮粗饲料。玉米青贮组和苎麻青贮组之间的Chao 1指数和观察到的微生物种类数量存在显著差异（<0.05）；然而，两组中主要的菌门均为厚壁菌门（相对比例：34.99 - 56.68%）、拟杆菌门（27.41 - 47.73%）和螺旋体门（1.44 - 3.92%）。对于2 cm和3 cm的切碎长度，普雷沃氏菌属的相对丰度最低（<0.05），且与瘤胃pH值和丙酸浓度呈负相关（<0.05），但与乙酸与丙酸的比例呈正相关（<0.05）。苎麻青贮饲料的发酵品质在切碎长度为1 cm时最高，这表明适度切碎可产生品质最佳的青贮饲料。
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