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Using electromagnetic induction technology to predict volatile fatty acid, source area differences.

Bryan L Woodbury¹, Roger A Eigenberg, Vince Varel

¹USDA-ARS, U.S. Meat Animal Research Center, Clay Center, NE 68933, USA. bryan.woodbury@ars.usda.gov

Journal of Environmental Quality

|August 27, 2011

Summary

This summary is machine-generated.

Electromagnetic induction can predict volatile fatty acids (VFAs) in feedlot manure after rain. Cattle diets influence VFA production, impacting potential odor emissions and enabling precision management.

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Area of Science:

Agricultural Science
Environmental Science
Animal Science

Background:

Manure accumulation on feedlots can lead to air emissions like odor and greenhouse gases.
Understanding manure composition is key to developing mitigation strategies.
Subsurface measurement techniques are being adapted for feedlot surface analysis.

Purpose of the Study:

To assess if electromagnetic induction (EMI) can predict volatile fatty acid (VFA) differences in feedlot surface material post-simulated rain.
To investigate the impact of cattle diet on VFA production and potential odor generation.

Main Methods:

Collected 20 manure samples per pen from eight pens with cattle fed two different diets.
Incubated samples for 3 days to quantify fermentation products (VFAs).
Developed calibration models using EMI properties and VFA data.

Main Results:

Diet did not significantly affect volatile solids (VS) concentration.
Corn-based diets produced more straight-chained and total VFAs (P ≤ 0.1).
WDGS-based diets produced more branched-chained VFAs (P ≤ 0.05), which have lower odor thresholds.

Conclusions:

Cattle diets significantly influence the types and quantities of VFAs produced after rain events.
EMI shows potential for predicting VFA generation and informing precision management.
Understanding odorant accumulation patterns can guide strategies to mitigate emissions.