What are you trying to feed and what do you want in a roach?
There are literally dozens of options when it comes to breeding roaches, all species are similar but have their own pros and cons and minor deviations as far as how prolific they are, their behavior, and their care.
Some roaches give live birth, some roaches lay eggs.
Some roaches are very prolific breeders, some are on the slower side.
Some roaches are small, some are large.
Some are fast, some are slow.
Some burrow, others don't.
Some climb glass, some cannot.
Cricket replacements: small, fast, prolific
Shelfordella (Blatta) lateralis - Turkistan roach AKA Red Runner/Rusty Reds will reproduce prolifically, stay small, attain adult size more rapidly, but lay egg cases. Do not climb.
Nauphoeta cinerea - Lobster Roaches are similar, but give live birth and can climb glass and smooth surfaces. This can be problematic for many keepers.
Both of these species tend to be on the smellier side due to their more rapid metabolisms. They are still far better than crickets in terms of smell, but a bin of 1000 lobsters isn't going to smell as nice as a bin of 1000 dubia.
Other common feeders roaches:
Blaptica dubia
Eublaberus posticus - Orange Head Roach
Most any of the Blaberus genus (discoidalis, hybrids, craniifer, fusca)
Gromphadorhina portentosa -Madagascar Hissing Roach for larger species. Also climb glass but give live birth.
Look into some of these or feel free to narrow down the list with what you are looking for in a feeder, then we can specifically address the information you are asking for per species. Each species has their own individually tailored needs and will grow and reproduce at different rates and in different ways. You rarely see separation of adults from nymphs in feeder colonies; only certain species are more readily cannibalistic and proper care generally prevents any real colony loss. You should be able to just let the colony go for months only tending to food and hydration needs and they will take care of the rest once set up and the result will be a bin full of a variety of sizes of roach. = )





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