That just depends on what you produce and what sex they are really. Last year I ended up keeping back 4 females. I missed on a few things so I let most of the stuff go. I obviously held back the nicest animals for upgrades to quality and gene count. I'm not going to holdback something just because I need to increase my numbers. It has to make sense from a quality AND utility aspect. A few of the snakes are keys to some long term projects I hope to accomplish. I would highly advise putting lots of thought into what you holdback. Numbers aren't everything
Regards,
B