(JTA) — The reports are coming fast and furious from the Costcos, butcheries and grocery stores of America: Kosher chicken is hard to come by. Facebook groups offer alerts when shelves are restocked. Some stores are limiting purchases; in others, customers are policing each others’ carts, looking for excessive stockpiling that could shut themselves and others out. While anyone who wants kosher chicken at their Passover seder should be able to get it, doing so might require more effort, cost or compromise than usual. That’s because an unusual array of forces have conspired to depress chicken production in the United...