反芻胃の消化に関する研究 : (第1報)フィステル設着山羊の飼養及びガスの組成に就て

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In order to elucidate the fermentative process in the rumen, goats whose rumen has a permanent fistula with fistula plug have been raised soundly for a long period (Fig. 1). In foreign country, the feeding of ruminant with a permanent fistula was hitherto reported by many workers. But our success of the raising should be the first one in Japan. The rumen gas was collected through the fistula plug under several conditions and subjected to analyses (CH4 C02, 02 and H2). (1) The animal was fed on a measured quantity of a fodder composed of mixed concentr ate and prairie hay once a day and the rumen gas was collected at definite time. Its composi-tion and the ratio C02/CH4, changed with the season. The pH of rumen liquor was always lower than 7 (Table 2). (2) In animal fed on concentrates the C02 content of rumen gas increased, reaching maximun 1_??_2 hrs after feeding, then decreased slowly. Its content was higher in the morning than in the afternoon. The CH4 content changed almost the same in manner as C02, but. a little irregularly. The ratio of C02/CH4 was not influenced by feeding, but its value was increased from morning to afternoon (Table 4). When the animal was fed on grazing, the increasing tendency of the ratio of C02/CH4 was the same as fed on concentrate, but its value was higher than the latter (Table 5).
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