can a leopard gecko breed when he has minor metabolic bone disease
I wouldn’t suggest it. Not good for the animal or its safety. @mblaney can say more on the issue.
It’s my opinion that no leopard gecko should be bred that’s suffered from MBD previously, but it’s most critical that females never be bred. MBD means weakened, deformed bones, among many other changes that aren’t as obvious- any animal that is deformed and compromised from extreme malnutrition (a) should not have the strain of reproduction placed on them, and (b) would not make good breeding stock anyway.
I would not recommend breeding he/she especially if its a female. Females will take calcium out of their bones even if they have lots of calcium which could cause severe damage if they have had MBD even if it was minor.