Zyfend AZyfend A is a proprietary, all natural supplement for use during feed changes, stressful times, environmental changes or other events to help maintain normal digestive health. With no egg discard! Currently used in organic certified flocks across the country. Contains enzymes, essential oils (flavoring) and yucca schidigera (flavoring) to help support normal digestion and digestive health. Make gut health a priority by adding Zyfend A to your poultry