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Related Experiment Videos

Feed intake effects upon gain, carcass yield, and ration digestibility in broilers force fed five feed intakes.

R G Teeter, M O Smith

    Poultry Science
    |November 1, 1985
    PubMed
    Summary

    Increasing broiler chick feed intake boosts weight gain up to 140% of ad libitum levels, but higher intakes reduce feed efficiency and digestibility. Birds adjust gastrointestinal tract size, not passage rate, to manage increased feed consumption.

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    Area of Science:

    • Animal Science
    • Poultry Nutrition
    • Avian Physiology

    Background:

    • Optimizing broiler chicken productivity is crucial for the poultry industry.
    • Understanding the physiological responses to varying feed intake levels is essential for feed formulation and management.

    Purpose of the Study:

    • To investigate the effects of increased feed intake on broiler chick productivity and physiological parameters.
    • To determine the optimal feed intake level for maximizing growth and feed efficiency.

    Main Methods:

    • Broiler chicks were force-fed at 75%, 100%, 125%, 140%, and 160% of ad libitum consumption.
    • Live body weight gain, feed efficiency, nutrient digestibility, digesta passage rate, and carcass characteristics were measured.
    • Gastrointestinal tract mass and contents were analyzed in relation to feed intake.

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    Main Results:

    • Live body weight gain increased up to 140% feed intake, then declined.
    • Feed efficiency and digestibility of most nutrients (fat, ash, protein, starch) decreased with higher feed intake.
    • Gastrointestinal tract mass increased with feed intake, accounting for significant body weight gain, while passage rate remained unaffected.
    • Dressing percentage and carcass gain-to-feed ratios declined significantly with increased feed consumption.

    Conclusions:

    • Broiler chicks can increase body weight gain by consuming up to 140% of ad libitum feed, but this comes at the cost of reduced feed efficiency and nutrient digestibility.
    • Birds adapt to higher feed intakes primarily by increasing gastrointestinal tract size rather than altering digesta passage rate.
    • Excessive feed intake beyond ad libitum levels negatively impacts carcass yield and overall feed utilization efficiency.