Hemicellulose does not affect iron bioavailability in chicks

Area of Science:

• Animal Nutrition
• Nutritional Biochemistry
• Dietary Fiber Research

Background:

• Iron bioavailability is crucial for animal health, and dietary fiber components like hemicelluloses are often investigated for their potential effects.
• Understanding how different fiber sources influence iron absorption is important for formulating effective animal diets.

Purpose of the Study:

• To assess the impact of hemicelluloses on iron bioavailability in chicks using hemoglobin as a response criterion.
• To determine if hemicellulose content in intact fiber sources or added psyllium husk affects iron absorption.

Main Methods:

• Two experiments were conducted: Experiment 1 used various intact fiber sources (tomato pomace, soybean hulls, beet pulp, orchard grass, corn fiber) added to a basal diet.
• Experiment 2 investigated the effect of psyllium husk on the bioavailability of ferrous sulfate iron using the slope ratio method.
• Iron bioavailability was measured using hemoglobin as the response criterion, and various fiber components were analyzed.

Main Results:

• Iron bioavailability from intact fiber sources varied significantly (26.5% to 94.0%) but was not correlated with the hemicellulose content of the feed or diet.
• The presence of 5% psyllium husk did not affect the bioavailability of ferrous sulfate iron, although iron intrinsic to psyllium was unavailable.
• Some high-hemicellulose feeds showed low intrinsic iron bioavailability, suggesting other factors are more influential.

Conclusions:

• Hemicelluloses do not appear to have a clear, direct effect on iron bioavailability in chicks.
• Other unidentified dietary factors likely play a more significant role in determining iron bioavailability from plant-based feed components.