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Old 06-20-2020, 07:35 PM   #24 (permalink)
freebeard
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I recall an example of putting round holes instead of horizontal slots in cattle trailers and how it reduces suffocation of the livestock!

It's on EcoModder somewhere. I don't trust Google to find it though.

Speed holes

https://i.kinja-img.com/gawker-media...jzd2eihqoc.jpg
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