They may be administered via feed or water, by injection, or via timed-release boluses.

可能通过饲料或水、注射或通过定时释放的丸药施用抗生素。

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There were no statistically significant differences in the frequency of PCA demands and delivered boluses or among perioperative VAS scores.

结果显示，在PCA 需要次数、 PCA 给药量及围术期VAS 评分方面没有显著的统计学差异。

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The results showed that the released amount of trace elements in the boluses could meet dairy cow's requirement and significantly improve milk yield and quality.

结果表明，缓释丸释放的微量元素能够提供产奶牛的需要，对产奶量和乳品质的提高有显著的影响。

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