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It's already possible to refine vegetable oils and animal fats, either as a replacement for petroleum or blended with it, and IIRC it's currently done by the Finnish Neste Oil (producing biogasoline, synthetic Diesel, biopropane and bioplastics) and by the American Propel Fuels (at least their synthetic green Diesel is made out of refined oils and fats). Since processed meats are consumed more frequently than fresh meat in the United States, sure there's a lot of locally-available feedstock for biofuels that wouldn't require major adaptations to be used and then become a good option to start a transition from fossil to renewable energy sources.
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