I've seen this argument get eaten, partialy digested, spit back up, then go through 3 compartments of a stomach and it still doesn't make sense when you actually think about it.
If the intent is actual sustainability, then they have to be given their full 20 years to live. The cattle themselves act as carbon sinks too and have to be part of the whole ecosystem, not only exposed to one part of it. If you're constantly slaughtering them and replacing them, it's not doing much. It just sounds nice.
>it costs a bit more
"A bit" is an understatement.
>The herbivores are key component of sustainable agriculture, you can't do it without them.
You can't. But you have to do it without eating the vast majority of them.
The Myth of Regenerative Ranching:
>[...]
>If regenerative agriculture were to challenge the mainstream food system, it would run into some hard physical limits. Converting the beef industry, at current levels of demand, entirely to a grass- and crop-forage feeding system would require increasing the total size of American beef herds by 23 million cows, or 30 percent, according to a recent article in the respected science journal Environmental Research Letters. And that increase, were it even possible, would have monumental consequences for both greenhouse gas outputs and land use. But there simply isn’t enough land in the U.S. for that many grazers. At best, beef production would have to decrease by 39 percent and potentially as much as 73 percent. Framed that way, grass-fed grazing, especially if scaled, doesn’t seem likely to regenerate many ecosystems—indeed, it would likely require deforestation, as is the case in Brazil, where the clear-cutting of the Amazon is driven both by soy plantations for feedlot and factory farm animal feed and by the need for grazing space for grass-fed cattle. And as the Environmental Research Letters article argued, even temporary overgrazing can lead to long-term and perhaps irreversible ecological degradation.
>[...]
>Actually making animal agriculture less ecologically disruptive would mean taking animals’ ecological value as a bedrock principle against and over their value as commodities. That means treating commodity production, not land, as “marginal”: Commodities could be extracted only if doing so didn’t disturb the ecological, social, and cultural value of the landscape. In other words, in most such systems, animals would more than likely play a minor support role for primarily plant agriculture. And that, in turn, would almost certainly mean far fewer grazers entering the commercial food system, and at a much higher price point. Point Reyes, for example, might feature free-ranging elk managed by an Indigenous best practice–driven conservation agency, not dairy cattle grazed by private ranches. This kind of truly eco-friendly meat production would produce even less meat than the current grab bag of practices loosely labeled “regenerative.”
https://newrepublic.com/article/163735/myth-regenerative-ran...