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Abstract
Synthetic foods varying in protein-carbohydrate ratio and total nutrient concentration
were used in food selection experiments to investigate the ingestive and post-ingestive
regulation of macronutrients by male and female nymphs of the German cockroach, Blattella
germanica (L.) (Dictyoptera: Blattellidae). For both nutrient imbalance and food dilution,
food ingestion varied between treatments with the effect that nutrient ingestion was
regulated. However, this mechanism was insufficient to compensate for some food dilution
treatments. In those cases, the regulation of protein intake was prioritised over
that of carbohydrate intake, and two additional regulatory responses were seen. Firstly,
cellulose digestion supplemented shortfalls in dietary soluble carbohydrates, and
secondly the feeding period within the stadium was prolonged. These ingestive, post-ingestive
and developmental responses were orchestrated in such a way that, in all treatments,
nutrient gain approached similar levels, despite the variation in food properties.