The Transfer of Ingesta from the Rumen:I. Sampling of Rumen Ingesta and Estimation of the Required Length of the Preliminary Feeding Period
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概要
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In order to harvest a sample of uniformly mixed ingesta from the rumen, two methods are generally employed. In one method is used a permanent fistula and in the other surgical operation performed whenever sampling is required. In this paper, both methods were evaluated.A permanent rumen fistula was affixed to a sheep weighing 30.5kg. A large iron cannula (9.1 cm in outside diameter, 8.6cm in inside diameter, and 5.3cm long) was inserted through the fistula into the rumen. It was impossible, however, to leave this cannula attached to the sheep for more than one month. This large cannula inserted is shown in Photograph 1.The other method was applied to another seep. When surgical operation was performed at the same site of the abdominal region to harvest the ingesta from the rumen, the sheep could stand the operation three times. When a different site was chosen in the abdominal region each time for operation, the operation could be performed at least four times in the same animal. The results of the operations are shown in photograph 2.It is necessary to determine the required length of the preliminary feeding period, a period from the beginning of feeding the ration on test to the time of sampling of rumen ingesta. This determination was made by a tracer method with another sheep and goat. Barium sulphate containing radioactive isotope of sulphur, 35S, was prepared by the author's method described in his previous report (Kametaka M. this journal, 26, (2): 103, 1955). Ba35SO4 suspended in a 5 per cent gelatin solution, was mixed with a ration of wild-grass hay chopped as uniformly as possible and given to two experimental animals. After the peroral administration, the collected feces were examined, after ashing, for radio activity at different times. As seen in Fig. 1, the appearance of radioactive material in the feces showed almost the same tendency in the two animals, the highest peak of excretion being found about the 28th hour after administration.No radioactive material was detected from the feces of the sheep on test at the 6th hour after admini stration and those of the goat on test at the 12th hour. Moreover, in Fig. 1, a second peak of excretion may possibly be found about the 44th hour after administration in both trials. These results seem to be related to the mixing of barium sulphate in the rumen and/or the passage of this indicator through both the reticulum and the omasum.From the results obtained in this experiment, it may be presumed that at least ten days are required for a preliminary feeding period, an interval between the beginning of feeding the ration on test and the time of sampling of rumen ingesta.
- 公益社団法人 日本畜産学会の論文
公益社団法人 日本畜産学会 | 論文
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