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Russian workers carried out a atudy on two groups of foxes. One had been selected over a number of years for quietness and ease of handling. The second group was wild and aggressive. Animals were killed and brains analyzed for serotonin (a natural tranquilizer). The quiet group had a much higher level.

This research indicates considerable value in the selection of quiet animals for breeding stock.

Fox Diseases. Novia Scotia Dept. of Agriculture and Marketing Livestock Service.