Growth, energetics and food conversion efficiency during the last larval stadium of the tobacco hornworm (Manduca sexta)

Academic Article

Abstract

  • 1. 1. The biochemical composition and energy content of last instar Manduca sexta larvae were determined daily during the feeding phase. Lipid content was significantly lower on day 1 (11.8%) than on days 2 (19.0%), 3 (18.8%) or 4 (21.3%), 2. 2. Energy content was lower on day 1 (18.89 kJ/g dry wt) than on days 2 (20.25 kJ/g dry wt), 3 (20.46 kJ/g dry wt) or 4 (21.13 kJ/g dry wt). 3. 3. Based on the amount of food eaten, feces produced, and weight gained, food digestion and conversion indices were calculated daily. Approximate digestibility decreased from 70% for the interval between days 1 and 2, to 62% for day 2-3, and finally to 56% for day 3-4. 4. 4. The efficiency of conversion of digested food increased from 60 (day 1-2) to 66% (day 2-3), and remained at that level for day 3-4. 5. 5. The efficiency of conversion of ingested food was 41% for days 1-2 and 2-3, then decreased to 37% for day 3-4. © 1992.
  • Digital Object Identifier (doi)

    Author List

  • Hayes SE; McClintock JB; Watson CJ; Douglas Watson R
  • Start Page

  • 395
  • End Page

  • 399
  • Volume

  • 102
  • Issue

  • 2