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《Acta Pratacultural Science》 2005-03
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Effect of substrates with different lignin content on rumen fungal attachment and fermentation in the rumen of goats

SUN Yun-zhang, MAO Sheng-yong, CHEN Jie, ZHOU Li-fen, ZHU Wei-yun (Laboratory of Gastrointestinal Microbiology, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China)  
Research was conducted to investigate the attachment on and fermentation profiles of substrates with different lignin contents by rumen anaerobic fungi in the rumen of goats. The substrates used in the study were: ryegrass leaf, ryegrass stem, rice straw and peanut hull. The research employed nylon bag implantation and in vitro fermentation techniques. With the procession of in vitro fermentation, anaerobic fungal population density in the cultures were shown to increase, with the largest fungal populations growing on ryegrass leaves, ryegrass stem and straw occurring after 48 h of incubation. Microscopic studies revealed that the number of sporangia attached to rice straw surfaces was significantly larger than those on ryegrass leaf and ryegrass stem during the initial 72 h of in vitro incubation (P0.05), while the number of sporangia attached to cut edges of different substrates were similar. In the rumen, sporangia attached to rice straw surfaces and to cut edges reached their respective maximal population numbers after 48 h of incubation and declined significantly after 72 h incubation (P0.05). However, sporangia attached to ryegrass stem surfaces and those attached to cut edges reached their maximal numbers at 24 h and declined sharply after 72 h of incubation (P0.05). The number of sporangia attached to the rice straw surface and cut edges was greater than ryegrass stem during the whole incubation period (P0.05). During the in vitro fermentation, the substrates showed no apparent differences in gas production, dry matter loss and cellulose loss. In the rumen, however, dry matter loss varied significantly between substrates, with values shown to be negatively correlated to the substrates lignin content (P0.05).
【Fund】: 教育部科学技术研究重点项目(02119)和国家自然科学基金(39870578)资助。
【CateGory Index】: S827
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