I used to feed Purina Flock Raiser or Layena pellets until my Rouen almost died from reproductive issues at the beginning of September. At that time, her Veterinarian recommended switching to Mazuri Waterfowl Maintenance due to, I believe, the Calcium/Phosphorous ratio (don’t quote me on that). I switched immediately. I don’t know if there’s a difference as Daphne immediately stopped laying for the season after her crisis and my Muscovy hens have always been perfectly healthy no matter what they have been fed. Along with the Mazuri, I feed mealworms as a treat + a variety of greens and a small amount of cracked corn in cold weather. In laying season, I offer oyster shell free choice. I’ll let you know this summer how things go with Daphne on the Mazuri. She’s always had reproductive issues that flare mid-summer and more seriously in early fall. We will see!