Intestine

Hello, We have problem with 40 weeks layers. Etiology is enteritis and fatty liver. Epizooty this moment is 2-3 percent in the week. In the feed since 35 age layers we use CCM 10 percent it is corn silage. We tried antibiotic, probiotic, prebiotic, acid, essential oil in the feed and in the water always have problem. Could you help me?