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Most of the 'food' that we feed cattle is agricultural waste that cannot be eaten by people and would otherwise simply be left to rot, and most cattle are raised on marginal land that cannot be used to grow crops. Farmers have a direct financial incentive to reduce inefficiency as much as possible, as inefficiency eats into their profit margins.
However, I think that Zeke was referring to small mammals getting killed during harvesting, which my googling suggests is more due to increased predation from loss of cover than getting chewed up by machinery. Depending on how you balance the utils of cows versus mice versus birds that prey on mice, it's certainly plausible that harvesting a field of wheat could produce more animal suffering than grazing cows on that same field.
The U.S. produces 51.5 million acres of hay and 37.3 million acres of wheat per year. So setting aside all other forms of animal feed, more land goes to producing hay alone than to wheat.
Which is why I'm pointing out that raising cattle at scale involves harvesting even more land. Estimating the effects on animals from cropland is difficult, but it's not a comparison that favors beef to begin with.
A lot of hay production is a tax write off- it’s cheaper to have a guy come bail up your hay on land you aren’t using for agriculture than it is to pay taxes on it. Some of that land is also fallowed, or hay is otherwise a secondary product(certain kinds of hunting leases, for example).
The Saw Doctors - Hay Wrap
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You can grow hay/alphalpha on extremely marginal land, which is largely unusable for other crops. I’m not arguing that these crops never displace food commodities, but in general I would expect that farmers favor food crops which are typically more valuable.
But zeke5123 is talking about accidentally killing animals as part of growing and harvesting crops, not optimal land use. That seems like it would be similar per-acre whether you're growing alfalfa or wheat.
It's a completely different subject but I'm reminded of Scott's 2015 post about California's water crisis:
https://slatestarcodex.com/2015/05/11/california-water-you-doing/
Which leads to interesting calculations like this:
But in any case the question of whether alfalfa is worth the resource usage has little to do with zeke5123's objection.
Alfalfa maybe, but generic hay production probably kills fewer animals because of less pest control, tilling, etc.- even though being a mouse caught in a mower is pretty bad, just like being a mouse caught in a combine harvester.
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California agriculture is feckin' crazy, because they're growing water-heavy crops in places never meant to grow anything, in order to exploit the good climate and growing seasons. And because they don't have sufficient water resources, they have to drag it out of rivers originating in other states.
But hey, that's their economy and their problem to sort out.
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