Feif un,
i have been to a kosher slaughterhouse with a very prominent and good hashgacha and the way the animals are kept and treated is definitly tzar ballai chaim (they are kept in overcrowded pens up to there ankels in excrement outside the slaughter house and are constantly being prodded with elecric prods when they were being unloaded off the truck some of them were pushed out so hard that they literaly tumbled into the pens on there sides)