Well, I have a somewhat different experience, which is probably out of the norm.
I have several corns that were raised over 3-4 years, and several that were raised in one or two years, to breeding size.
My lavender, who is 5 years old, now has a prolapsed somethng or other. I think it's his rectum, actually, not his hemipenis, because it doesn't look like the pictures of prolapsed hemipenes. Going to the vet today. Can't explain that.
I have a 5 year old Amelanistic Corn and she is my favorite snake, personality wise. I raised her from a hatchling, slowly. She got egg bound this year, but appears to have passed them all now, but there is a lump on one side of her, laterally very near the vent, like a egg-shaped protrusion. It is not going away.
So, my slowly grown snakes are having health problems.
My "power-fed" snakes are doing great. I have one corn who is in her second breeding season, and isn't quite 3 years old. She lays the healthiest clutches, regains weight quickly, has the most ferocious feeding response (even on thawed prey) and is altogether feisty.
Also, I have an 11 month old female who just laid a perfect clutch of 14 eggs, and she is gaining her weight back quickly, though I have no intention to double clutch her. She is not, in any way, obese.
I am really shooting for the middle ground as far as feeding goes. I have tried it both ways, and it doesn't seem to make much difference if you ask me. My experience is fairly limited so far, but that's what it has been.
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Jeremy J. Anderson
Gem State Reptiles
