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Functional Complementation Analysis (FCA): A Laboratory Exercise Designed and Implemented to Supplement the Teaching of Biochemical Pathways
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Plant secondary compounds as complementary resources: are they always complementary?

G Copani1, J O Hall, J Miller

  • 1University of Catania, DISPA Sezione di Scienze delle Produzioni Animali, Catania, Italy.

Oecologia
|December 11, 2012
PubMed
Summary
This summary is machine-generated.

Herbivores benefit from mixed diets, but plant compounds can be complex. Combining tannins and saponins improved nutrient intake but worsened parasite infections in sheep.

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Area of Science:

  • Animal Nutrition
  • Parasitology
  • Plant Chemistry

Background:

  • Generalist herbivores often thrive on varied diets due to nutrient complementarity or dilution of plant secondary compounds (PSC).
  • PSC can negatively impact herbivore fitness but may offer benefits like reduced parasitic infections at specific doses.
  • Understanding interactions among diverse PSC is crucial for herbivore health and diet selection.

Purpose of the Study:

  • To assess the complementary effects of condensed tannins and saponins on sheep nutrition and parasitic infection.
  • To investigate how dietary choices involving multiple PSC influence nutrient intake and parasite burden.

Main Methods:

  • Sheep (Ovis aries) were offered a choice of foods containing condensed tannins and saponins, or single rations of each.
  • Parasitic challenge was induced using Haemonchus contortus.
  • Nutrient intake and fecal egg counts (as a measure of parasitic load) were monitored.

Main Results:

  • Sheep offered a choice of tannin- and saponin-containing foods consumed more than those offered single rations.
  • However, sheep on mixed diets exhibited higher fecal egg counts, indicating a greater parasitic burden.
  • Dietary complementarity for nutrient intake was observed, but antagonism occurred regarding parasite load.

Conclusions:

  • Condensed tannins and saponins act as complementary resources for nutrient intake but antagonistic for controlling parasitic infections in sheep.
  • The interaction effects of PSC depend on the specific health dimension considered (e.g., nutrition vs. disease).
  • Further research using a unifying metric like growth or reproduction is needed to balance the costs and benefits of consuming multiple PSC.