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In page Guinea pig:

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In geriatric boars or sows (rarely in young ones), the muscles which allow the cecotropes to be expelled from the anus can become weak. This creates a condition known as fecal impaction, which prevents the animal from redigesting cecotropes even though harder pellets may pass through the impacted mass.[5] The condition may be temporarily alleviated by a human carefully removing the impacted feces from the anus.[citation needed]