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Choose general bungalows (old pig houses, hen houses), and spread 5 to 7 cm thick chips or rakes on the ground. It is better to use 50 to 100 animals per group, separated by a nylon mesh of 3 cm 3 cm holes and a mesh height of 1.8 to 2.0 cm. Use plastic buckets and buckets, or long wooden troughs and small ceramic tanks, but use bamboo bars to keep them out of the circle.