Show martens raised in captivity the raising of martens in cap captivity Is now commercially possible as a result of the discovery of their breeding season by naturalists natura lists of the biological survey of the united states department of agriculture these valuable fur bearers mate late in july and in august and appear to have a gestation period of eight months much longer than most animals of the same group it was formerly thought that their breeding beason acason was in the fall or winter the young being born in the spring |