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Related Experiment Videos

Lactose load diet effect in rats.

R C De Angelis, G G Giuli, R N Rogano

    Arquivos De Gastroenterologia
    |October 1, 1984
    PubMed
    Summary

    Rats can tolerate diets with up to 20% lactose without adverse effects. Higher lactose levels may cause diarrhea, and protein quality evaluation requires adapted methods when using lactose.

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    Area of Science:

    • Animal Nutrition
    • Dietary Studies
    • Physiological Responses

    Background:

    • Lactose is a common carbohydrate in diets.
    • Understanding lactose tolerance in animal models is crucial for nutritional research.
    • Previous studies have indicated potential digestive issues with high lactose intake.

    Purpose of the Study:

    • To investigate the effects of varying dietary lactose levels on rat physiology.
    • To determine the threshold for lactose intolerance in weanling and adult rats.
    • To assess the impact of lactose on protein quality metrics.

    Main Methods:

    • Rats (weanling and young adult) were fed diets with lactose (L) concentrations up to 50% for 15 days.
    • Measurements included body weight variation, fecal pH, Net Protein Ratio (NPR), and Protein Efficiency Ratio (PER).
    • Control groups received diets without added lactose.

    Main Results:

    • Lactose levels above 20% impaired growth in rats.
    • Diarrhea was observed only at the highest lactose concentration (50%).
    • Appetite stimulation between 1-5% lactose partially affected NPR and PER; results at 10-20% were comparable to controls.

    Conclusions:

    • Rats exhibit tolerance to dietary lactose levels up to 20%.
    • Lactose intolerance and significant digestive issues manifest at concentrations exceeding 20%.
    • Evaluating protein quality in the presence of lactose necessitates the use of adapted methodologies.

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