It seems like there are a ton of opinions out there, on the correct breeding weight and age minimums that are best for male BPs. I read somewhere that someone recommended not breeding males under a certain adult-sized weight.. well, I don't think this is true.. I have had a few reputable people tell me that breeding smaller males was fine, or have seen them post pics of theirs, some as small as 300g, getting it done..
Here's my view; I might not be a breeder who's hatched 1000 litters and done it for 50 years, but I will weigh in.. I am currently using my 550g male Pastel as a breeder. He was producing sperm plugs when I got him months ago, and was around 450-ish grams then. I let him acclimate and got him feeding, and saw no problem with using him to breed.
Now, I rotate him, letting him lockup with my female for however long he will (1-2 days.) I then put him back into his tub alone, rest him a day, feed, let him digest for two days and reintroduce him to his female. He is the picture of health, not one of those fat stuffed-sock snakes, but definately not at all thin or underweight; he is still steadily growing and gaining weight in a normal fashion.. I see no ill effects. And after a few more breedings it will all be over and he can go back to being a lazy boy and grow-on more..
As long as he's showing the interest and not refusing food or losing weight, how is this bad?