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Campbell's hasn't used spent hens for quite a while. The two biggest buyers are the USDA's National School Lunch Program and pet food manufacturers.
According to USDA data for last year, 172 million chickens other than broilers were sold for slaughter and 107 million were lost, rendered, or composted. That's a drop in the bucket compared to the 8.5 billion bird per year broiler industry in the U.S.
Processing spent layers is pretty inefficient. The egg producers get a dime or two per bird, if that. There isn't much meat there, carcass condemnation rates are high, transportation and processing costs are high. As markets for such product shrink, sometimes the only option is to just compost them on site.