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Animal fat effects on nutrient utilization.

P M Maiorino, A A Al-Hozab, R Mitchell

    Poultry Science
    |December 1, 1986
    PubMed
    Summary
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    The carrier feedstuff significantly impacts the true metabolizable energy (TME) of tallow in laying hens. Wheat bran and dehydrated alfalfa meal yielded the highest tallow TME values, indicating their effectiveness in enhancing energy utilization.

    Area of Science:

    • Animal Nutrition
    • Poultry Science
    • Feed Evaluation

    Background:

    • Accurate determination of the energy content of feed ingredients is crucial for optimizing poultry diets.
    • Tallow is a common energy source in poultry feed, but its energy value can be influenced by the diet matrix.
    • Understanding the interaction between tallow and different feedstuffs is essential for precise feed formulation.

    Purpose of the Study:

    • To investigate the effect of various carrier feedstuffs on the true metabolizable energy (TME) of tallow in laying hens.
    • To quantify the TME of tallow when supplemented with corn, milo, soybean meal, wheat bran, and dehydrated alfalfa meal.
    • To determine how different carriers influence tallow absorbability and overall energy utilization.

    Main Methods:

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  • Laying hens were fed diets containing tallow (0-6%) mixed with different carrier feedstuffs (corn, milo, soybean meal, wheat bran, dehydrated alfalfa meal).
  • True metabolizable energy (TME) was determined using bomb calorimetry of feed and excreta samples.
  • Tallow TME values were calculated based on absorbability data, including fat and protein retention.

    • Main Results:

    • Tallow TME estimates varied significantly with carrier feedstuff, ranging from 7.19 kcal/g (soybean meal) to 13.62 kcal/g (wheat bran).
    • Tallow supplementation primarily affected fat retention in corn, milo, and soybean meal diets, with calculated absorbabilities between 95.8% and 107.3%.
    • Wheat bran and dehydrated alfalfa meal resulted in the highest tallow TME values, attributed to increased protein retention and, in the case of dehydrated alfalfa meal, improved starch absorption.

    Conclusions:

    • The choice of carrier feedstuff critically influences the true metabolizable energy (TME) value of tallow in poultry nutrition.
    • Wheat bran and dehydrated alfalfa meal appear to be superior carriers for maximizing tallow's energy contribution due to enhanced nutrient retention and absorption.
    • These findings highlight the importance of considering feed matrix effects when evaluating the energy value of supplemental fats for laying hens.