Don't produce - fed off
Kill babies - fed off
Sick - fed off
Jumpy - fed off
Bite me - whacked on cement then fed off
Looks like rule # 2 to me. 
Of course rules are made to be bent and even broken, if you have no other breeder female and need the production, hang onto her a little while until you can raise up a replacement. Also, once you've identified un undesirable trait in a breeder, NEVER hold back any of their babies as breeders. Not to say it would be for certain heritable, but why even waste your time?
I have dozens of breeder females and at the first sign of any trouble, they go the retirement village - AKA snakes stomache! 
>>this is a second time breeder that i had posted about yesterday that had some dead babies today i seen her eating a baby? i have removed her from that tub and i have another mother nursing a differnt litter. should she be fed off?? any comments? thanks.
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Thanks,
Dave Colling

www.rainbows-r-us-reptiles.com
0.1 Wife (WC and still very fiesty)
0.2 kids (CBB, a big part of our selective breeding program)
LOL, to many snakes to list, last count:
19.29 BRB
13.18 BCI
And those are only the breeders 
lots.lots.lots feeder mice and rats 