Some synchrony can be obtained in these cultures by controling food availability . The added cost of this approach includes space for the subcultures and personnel time in sorting and separate rearing. The most expensive in time and effort involves maintaining strictly synchronous cultures. Additional efficiencies can be obtained by scaling up the operation to larger numbers and sustained use of the facility. This also included a wastage of all the males which were not used in the study.
Larger cockroaches have similarly longer life cycles.
Twelve linkage groups have been identified and many linkage groups have been linked with chromosomes via translocation mutants. Cockroaches form a group which are only rivaled by the mosquito in economic and health consequences in the western world. As a pest the cockroach is unrivaled as an urban pest. There is a zero tolerance of cockroaches in the minds of most housekeepers and restaurateurs. Interest in the cockroach has been shown by the pesticide industry, the medical community, neurobiologists, developmental biologists and a fascinated public.