首页> 美国卫生研究院文献>Journal of the American Association for Laboratory Animal Science : JAALAS >Effects of a 28-Day Cage-Change Interval on Intracage Ammonia Levels Nasal Histology and Perceived Welfare of CD1 Mice
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Effects of a 28-Day Cage-Change Interval on Intracage Ammonia Levels Nasal Histology and Perceived Welfare of CD1 Mice

机译:28天换笼间隔对笼内氨水平鼻腔组织学和CD1小鼠感知福利的影响

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摘要

We measured daily intracage ammonia levels and performed weekly assessments of CD1 male, female, and breeder mice housed within disposable, ventilated cages that remained unchanged for 28 d. We tested housing groups comprising 1, 3, or 5 sex-matched mice per cage and breeder pairs with litters. Mice housed in cages with higher concentrations of ammonia developed degeneration and inflammatory lesions in the nasal passages. Mean ammonia exposure levels that caused rhinitis were 181 ppm for 18 d. Ammonia exposures of 93 ppm for 16 d caused necrosis of the olfactory epithelium, whereas 52 ppm for 13 d caused epithelial degeneration. Observers could not detect visible signs of rhinitis or identify cages with elevated ammonia levels, nor did they identify any sick or distressed mice. Observers consistently assigned poorer welfare scores as cages became dirtier. We conclude that we can extend the cage-change interval to at least 28 d for disposable, ventilated caging housing a single CD1 mouse. Cages containing 3 CD1 mice of either sex should be changed biweekly, and cages containing 5 CD1 mice or breeder pairs should be changed at least once weekly.
机译:我们测量了笼中的每日氨水平,并每周评估了放置在一次性通风笼中的CD1雄性,雌性和种鼠的情况,这些笼子保持28天不变。我们测试了每个笼子和带有垫料的育种对包括1、3或5个性别匹配的小鼠的住房群。关在笼子里的氨含量较高的小鼠在鼻腔中会发生变性和炎症性病变。导致鼻炎的平均氨暴露水平为18天,为181 ppm。氨暴露93 ppm持续16 d导致嗅觉上皮坏死,而氨暴露52 ppm持续13 d导致上皮变性。观察者无法检测到明显的鼻炎迹象,也无法识别出氨含量升高的笼子,也无法识别出任何患病或受困扰的小鼠。随着笼子变得更脏,观察员们总是给予较差的福利评分。我们得出的结论是,对于容纳一只CD1鼠标的一次性通风笼子,我们可以将笼子更换间隔至少延长到28 d。每两周更换一次包含3只CD1小鼠的笼子,每星期至少一次更换一次包含5只CD1小鼠或种对的笼子。

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