Animal Welfare Regulations for rabbits require:

The requirement for cages to be sanitized once every 30 days is aligned with the Animal Welfare Regulations for rabbits. Proper sanitation is crucial in maintaining the health and wellbeing of laboratory animals, including rabbits. Such cleaning protocols help reduce the risk of disease transmission and ensure a hygienic environment that promotes the welfare of the animals.

Regular sanitation is essential because it minimizes the buildup of waste, which can harbor pathogens and create an unhealthy living environment. The 30-day requirement strikes a balance between effective cleanliness and practical management, allowing for routine maintenance that doesn't disrupt the animal's care unnecessarily.

The other options do not accurately reflect the regulations pertaining to rabbit care under the Animal Welfare Act or may not be standard practice. For instance, cleaning pans/troughs too infrequently or requirements around mechanical heating might not be stipulated in the same way under these regulations, while cage height requirements focus more on the space and enrichment needs of the animals rather than just the sanitation protocol.