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Related Experiment Videos

D-cystine utilization by the chick.

D H Baker, J M Harter

    Poultry Science
    |March 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Young chicks cannot utilize the D-isomer of cystine. Studies show that chicks fed DL-cystine, unlike L-cystine, did not show improved growth, indicating poor D-amino acid bioavailability in poultry.

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    Area of Science:

    • Animal Nutrition
    • Biochemistry
    • Poultry Science

    Background:

    • Cystine is a crucial amino acid for poultry growth and feather development.
    • Methionine can be converted to cystine, but the dietary requirement for cystine itself is also important.
    • Understanding the bioavailability of different cystine isomers is vital for formulating cost-effective and efficient poultry diets.

    Purpose of the Study:

    • To determine if young chicks can utilize the D-isomer of cystine.
    • To compare the efficacy of L-cystine versus DL-cystine in poultry diets.
    • To assess the bioavailability of D-amino acids in chicks.

    Main Methods:

    • Chicks were fed purified diets containing crystalline amino acids.
    • Diets were supplemented with graded levels of either L-cystine or DL-cystine.

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  • Methionine levels were adequate, but cystine was absent.
  • Growth performance and slope-ratio assays were used for efficacy comparison.

    • Main Results:

    • Chicks fed L-cystine showed improved growth performance.
    • Chicks fed DL-cystine did not exhibit significant growth improvements compared to controls.
    • Slope-ratio efficacy comparisons indicated that the D-isomer of cystine was not utilized by the chick.

    Conclusions:

    • The D-isomer of cystine is not biologically available to young chicks.
    • Dietary supplementation with DL-cystine is ineffective for improving chick growth when methionine is adequate.
    • Poultry nutrition formulations should prioritize L-cystine or its precursors for optimal chick development.