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Not just age, but I suspect the longer they keep them, the more it costs to keep them. Everything has a shelf life, and unfortunately that includes animals. It seems a waste to me, but I don't know what goes on behind the scenes there.
This would be the greed angle. I still don't think a plant gets closed and 2 days later they're talking about killing the animals. They already have alot of money invested in those animals. Maybe it's an angle to get propped up by Uncle Sam? Maybe they want their cut of the pie also?