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Related Experiment Videos

Zinc oxide to induce molt in layers.

B L Goodman, R A Norton, O H Diambra

    Poultry Science
    |November 1, 1986
    PubMed
    Summary

    Zinc oxide (ZnO) supplementation in diets did not significantly impact hen production or egg quality during induced molting. Fasted hens showed the lowest feed consumption and cost during the molting period.

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    Area of Science:

    • Animal Science
    • Poultry Nutrition
    • Reproductive Physiology

    Background:

    • Induced molting is a common practice to rejuvenate aged layer flocks.
    • Dietary manipulation, including nutrient restriction or supplementation, is used to synchronize molting.
    • Zinc oxide (ZnO) has been explored as a potential dietary component for induced molting.

    Purpose of the Study:

    • To evaluate the efficacy of dietary zinc oxide (ZnO) for induced molting in Leghorn hens.
    • To compare ZnO supplementation with traditional feed withdrawal (fasting) for molting.
    • To assess the impact of different ZnO concentrations and durations on production parameters.

    Main Methods:

    • Two experiments were conducted with Leghorn hens subjected to fasting or diets supplemented with varying levels of ZnO (2,500, 5,000, 10,000 ppm) for different durations (7, 14, 21 days).
    • Production parameters including days to cessation and return to 50% production, egg production, egg weight, feed conversion, mortality, and egg quality (Haugh units) were monitored.
    • Statistical analysis was performed to determine significant differences among treatments.

    Main Results:

    • No significant differences in most production parameters (days to return to 50% production, hen-day production, egg weight, feed conversion, mortality, Haugh units) were observed between ZnO-supplemented groups and the fasted control in Experiment 1.
    • In Experiment 2, hens fasted or fed 10,000 ppm ZnO ceased production faster than those fed 5,000 ppm ZnO, but return to production did not differ.
    • Fasted hens exhibited the lowest feed consumption and feed cost per hen-day during the molting period.

    Conclusions:

    • Dietary ZnO supplementation at the tested levels and durations does not offer significant advantages over feed withdrawal for induced molting in Leghorn hens.
    • Feed withdrawal remains an effective and cost-efficient method for inducing molt, resulting in the lowest feed costs.
    • Further research may explore alternative mechanisms or lower concentrations of ZnO if its potential benefits are to be realized.

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