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The Use of an Automated System GreenFeed to Monitor Enteric Methane and Carbon Dioxide Emissions from Ruminant Animals
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Enteric methane from lactating beef cows managed with high- and low-input grazing systems.

M B Chiavegato, J E Rowntree, D Carmichael

    Journal of Animal Science
    |May 29, 2015
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    Different stocking rates and densities did not impact daily methane emissions in beef cows. However, methane emissions per unit of energy intake were lower in System B, suggesting cows selected higher-quality forage.

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    Area of Science:

    • Animal Science
    • Ruminant Nutrition
    • Environmental Science

    Background:

    • Enteric methane (CH4) emissions from livestock contribute to greenhouse gas emissions.
    • Optimizing grazing management can potentially mitigate CH4 production in beef cattle.

    Purpose of the Study:

    • To compare methane (CH4) emissions from lactating beef cows under varying stocking rates and densities.
    • To test the hypothesis that lower stocking rates with higher stocking density increase CH4 emissions due to reduced forage quality.

    Main Methods:

    • Utilized a sulfur hexafluoride (SF6) tracer gas method for enteric CH4 measurements.
    • Employed a crossover design with repeated measures to assess treatment effects over two grazing periods (P1, P2) in 2012 and 2013.
    • Determined dry matter intake (DMI) using chromic oxide (Cr2O3) and analyzed forage for nutritional composition and botanical makeup.

    Main Results:

    • Postgrazing herbage mass was higher in System A (1 cow/ha) than System B (2.5 cows/ha) in both years.
    • No significant treatment effect on DMI was observed; however, DMI increased from P1 to P2 for both systems.
    • Daily enteric CH4 emissions did not differ between treatments, but CH4 emissions per unit of gross energy intake were lower in System B during P1.

    Conclusions:

    • Grazing management strategies involving different stocking rates and densities did not significantly alter daily enteric CH4 emissions in lactating beef cows.
    • Lower enteric CH4 emissions per unit of energy intake in System B suggest potential for improved forage selection and energy utilization.
    • Findings indicate that grazing beef cows may select high-quality forage, leading to comparatively lower CH4 emissions, even under varied management conditions.