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Related Experiment Videos

Dietary selection for lysine by the chick.

R K Newman, D C Sands

    Physiology & Behavior
    |July 1, 1983
    PubMed
    Summary

    Broiler chicks can sense lysine in feed but do not self-regulate intake for optimal growth. Chicks prefer adequate lysine diets but consume insufficient amounts for maximum growth potential.

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    Area of Science:

    • Animal Nutrition
    • Poultry Science
    • Amino Acid Metabolism

    Background:

    • Lysine is an essential amino acid crucial for broiler chicken growth.
    • Dietary choices influence nutrient intake and growth performance in poultry.
    • Understanding nutrient selection behavior is key to optimizing feed formulations.

    Purpose of the Study:

    • To investigate broiler chicks' ability to discern and select diets based on lysine content.
    • To evaluate the impact of dietary lysine choice on growth performance.
    • To determine if chicks can differentiate between L-lysine and D-lysine.

    Main Methods:

    • Offering broiler chicks simultaneous choices between synthetic diets varying in lysine levels (adequate, low, devoid).
    • Providing separate feeders for diets and pure L-lysine hydrochloride.
    • Comparing growth rates and body weights of chicks under different dietary choice scenarios.
    • Assessing preference for diets containing L-lysine versus D-lysine.

    Main Results:

    • Chicks consistently preferred diets adequate in lysine over those low or devoid of it.
    • Growth rates were reduced (60-80%) when chicks had dietary choices compared to a single adequate diet.
    • Chicks supplemented with L-lysine HCl selected some but not enough for normal growth.
    • A preference for L-lysine over D-lysine was observed, though not sufficient for optimal growth.

    Conclusions:

    • Broiler chicks possess the ability to detect L-lysine in feed or as a supplement.
    • Chicks do not self-regulate lysine intake to achieve maximum growth potential when given choices.
    • Sensory recognition of lysine may influence diet selection, as evidenced by the preference for D-lysine over a lysine-devoid diet.

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