As demand for chicken declines, bankrupt Pilgrim's Pride idles Georgia processing plant that provided 1,000 jobs, $300,000 in annual county tax revenues. It also shuns prospective buyers, saying that selling to competitor wouldn't reduce chicken supply. In town, poultry insurer braces for drop in business; hospital girds for more uninsured patients. Most big chicken companies reducing output; chicken prices have increased since Pilgrim's closed its plants.