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Related Concept Videos

Light Acquisition02:16

Light Acquisition

In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
Adaptations that Reduce Water Loss01:57

Adaptations that Reduce Water Loss

Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.

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Related Experiment Video

Updated: Jun 2, 2026

Integrated Field Lysimetry and Porewater Sampling for Evaluation of Chemical Mobility in Soils and Established Vegetation
10:05

Integrated Field Lysimetry and Porewater Sampling for Evaluation of Chemical Mobility in Soils and Established Vegetation

Published on: July 4, 2014

Xanthophyll bioavailability in dehydrated turf grass

K R Robbins

    Poultry Science
    |January 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Dehydrated turf grass (DTG) and corn gluten meal (CGM) equally enhance egg yolk color. Xanthophyll from DTG is 100% bioavailable compared to CGM, offering a viable alternative for poultry feed.

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    Area of Science:

    • Animal Science
    • Poultry Nutrition
    • Feed Additives

    Background:

    • Egg yolk pigmentation is crucial for consumer acceptance and egg value.
    • Xanthophylls are key carotenoids responsible for yolk color.
    • Alternative xanthophyll sources are sought to optimize poultry diets.

    Purpose of the Study:

    • To compare dehydrated turf grass (DTG) and corn gluten meal (CGM) as xanthophyll sources for egg yolk pigmentation.
    • To determine the bioavailability of xanthophyll from DTG relative to CGM.
    • To assess the impact of dietary xanthophyll levels on egg yolk color characteristics.

    Main Methods:

    • A 16-day feeding trial with 270 32-week-old laying hens.
    • Experimental diets formulated with 0, 5, 10, 15, or 20 mg total xanthophyll/kg, sourced from either DTG or CGM.
    • Evaluation of egg production, feed consumption, and egg yolk color parameters (dominant wavelength and excitation purity).

    Main Results:

    • Dietary treatments did not affect egg production or feed consumption.
    • Egg yolk color excitation purity increased quadratically with dietary xanthophyll levels for both DTG and CGM.
    • The xanthophyll in DTG demonstrated 100% bioavailability relative to CGM.

    Conclusions:

    • Dehydrated turf grass is an effective source of xanthophyll for improving egg yolk color.
    • The bioavailability of xanthophyll from DTG is equivalent to that from CGM.
    • DTG can be utilized as a viable alternative xanthophyll source in laying hen diets.