yes it's the fat factor.Obesity affects fertility as we are forever being told.Virginity is the ruin of them and unmated does quickly become xxl.They are really difficult to show as adults for the same reason.All those people who think it's cruel to do back to back breeding would think differently if fawns/reds were their variety,they are better bred like that in my opinion.9/10 weeks is good for does,they are excellent mothers even as youngsters.