http://extension.entm.purdue.edu/urb...ocs/8Kells.pdf
Abstract:
Nutritional status of German cockroaches from the field (HUD apartments) was estimated using uric acid content to measure
amount of protein consumed, and respiratory quotient (RQ) to measure fat and carbohydrate metabolized. Initial trials demonstrated
the stability of these two indicators as nymphal cockroaches grow and with timing of meals. Nutrient consumption (and presumed
availability) was estimated by comparing uric acid content and RQ of nymphal cockroaches collected from kitchens of HUD
apartments with those reared in the laboratory and provided a series of meridic diets. Uric acid content was linearly related to
percentage of dietary protein (y=6.2x232.07, r
2
=0.96) and RQ was linearly related to log10(% fat:% carbohydrate)
(y=20.148Log(x)+0.790, r
2
=0.68). Field-collected German cockroaches contained 10.9±7.7 to 22.9±5.1 µg/mg uric acid and RQ of
0.770±0.024 to 0.803±0.260. Comparatively, cockroaches provided rodent chow had greater uric acid content (125.1±9.6 µg/mg)
and RQ (0.878±0.022). Employing linear calibration and these regressions, diet consumed by German cockroaches in the field was
estimated at 7±3% to 9±3% protein and equivalent amounts of carbohydrates and fat as an energy source. German cockroaches in
the field consume less protein and carbohydrates, and more fat compared to those provided a standard laboratory diet such as rodent
chow. Diet available in the field is considered suboptimal, resulting in physiological stress; the biological implications of this stress
are discussed."
Summary: Field-collected cockroachs contained an average of 15µg/mg uric acid while those fed a dietary rodent chow had an average of 125µg/mg uric acid. Its all in the diet that the roaches are provided.
Good points to bring to public attention, Corey. It is important that people know to avoid excess protein in the diets of their feeder roaches for the safety of their pets. Sadly, this information is not very widespread past this forum.