I would personally start with the 3 you have and go from there. Actually experience the breeding season with what you have. Even if it's normal to normal it's still an experience to see if this is actually something you want to do and it will give you some insight for future seasons.
Also the necessary evil to breeding BP's is breeding rats. You will prob need to get 2 racks going on rats and the over flow you can sell to local people.
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