If you’re having turkey at your Thanksgiving, Karen Davis is not the guest you want at your table. The president of United Poultry Concerns and a tireless advocate for chickens, turkeys and other farmed fowl, Davis can rattle off details and statistics about how turkeys are raised and “harvested” (industry-speak for slaughtered) that are guaranteed to curb — or kill — your appetite. But she’ll settle for three big reasons to skip the turkey this Thanksgiving: “Animal cruelty, disease, filth — the toxic waste in the conditions in which the birds are forced to live.” ADVERTISEMENT According to the U.S....