WOW! 16 any genetic?

I use a cooler, a piece of dry ice (99 cents at WalMart) and some pegboard. Put the dry ice and a little water in the bottom of the cooler, put the pegboard over the ice, supported by a couple of little pieces of wood, or whatever you have handy. The pegboard makes a vented floor over the ice and prevents the rat from coming in contact with the ice. Add rat, close lid, and wait 20 - 30 minutes. The rat falls asleep, suffocates.

that sounds like a good idea. also sometimes my male attacks some of the females. do you no why that is?

His 'attacking' is probably him mating. Rats play rough sometimes too.

i was talking about the mice ( sorry if it soounds like im saying it mean but im not) he wasnt mating them because i seen blood on one female

Sometimes their claws make each other bleed.. just keep an eye on them.