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Related Experiment Videos

Nutrient digestibilities in ingredients fed alone or in combinations.

I Hansen1, T Larsen, K E Knudsen

  • 1National Institute of Animal Science, Animal Physiology and Biochemistry, Tjele, Denmark.

The British Journal of Nutrition
|July 1, 1991
PubMed
Summary

Predicting feed digestibility in mixtures is possible using individual ingredient data. Calculations for protein, dry matter, energy, starch, and fiber digestibility are generally accurate, with minor exceptions noted for specific combinations.

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Area of Science:

  • Animal Nutrition
  • Nutrient Digestibility
  • Feed Formulation

Background:

  • Accurate prediction of nutrient digestibility in feed mixtures is crucial for effective animal nutrition and feed formulation.
  • Existing methods often rely on individual ingredient digestibility coefficients, but their applicability to complex mixtures requires validation.

Purpose of the Study:

  • To evaluate the precision of predicting digestibility coefficients (DC) for protein, dry matter (DM), energy, starch, and dietary fibre in feed mixtures.
  • To determine if individual ingredient DC values can accurately predict DC in various feed combinations fed to growing rats.

Main Methods:

  • Digestibility studies were conducted with growing rats using six individual feedstuffs (soya-bean meal, barley, rapeseed meal, peas, wheat bran, wheat).
  • Fourteen different diets were formulated, including individual ingredients and various combinations.

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  • True digestibility of protein (TD) and apparent digestibility of starch, dry matter (DM), energy, and dietary fibre (insoluble and soluble) were measured.

    • Main Results:

    • True protein digestibility (TD) and apparent starch digestibility were accurately predicted in most mixtures, with an exception for peas + barley.
    • Dry matter (DM) and insoluble dietary fibre digestibility were predictable from individual ingredient values across tested diets.
    • Energy digestibility prediction was accurate for most mixtures, except for barley + wheat and peas + wheat combinations.
    • Soluble dietary fibre digestibility prediction was reliable except for rapeseed meal + barley, peas + barley, and peas + wheat diets.

    Conclusions:

    • Digestibility coefficients for TD, DM, energy, starch, and dietary fibre in feed mixtures can be calculated with high precision from individual ingredient DC values.
    • While discrepancies exist for specific ingredient combinations, the predictive accuracy is generally high.
    • Caution is advised when formulating mixtures with high levels of dietary fibre, particularly soluble fibre, due to potential prediction variations.