Ask the Swan Specialist
Date: 3 July 2015
Absolutely DO NOT feed them cat or dog food. This is too high in protein and can cause them to develop a condition called angel wing, slipped or backwards wing. This occurs when the diet is too high in protein and the wings develop faster than the soft supporting tissue. Hence, the wing cannot be supported properly and may appear to grow backwards because it slips out of its supporting structure.
You should be feeding them a mixture of cracked corn and poultry layer pellets. The cracked corn will provide them necessary Vitamin A. Without this important vitamin, they can develop neurological problems. The poultry layer pellets will provide necessary vitamins, minerals and micronutrients. You can also provide chopped lettuce for their supplemental vegetative needs.
By the photos, they do look a little underweight, but this may or may not have to do with their diet. If there is something wrong with their digestive system and they cannot process food properly, this could be a cause as well as the possibility of parasites. You need to get them to an avian (bird)/waterfowl or poultry veterinarian and have them tested for worms, giardia or other potential parasites. A dosage of ivermectin or other such medication can be prescribed and administered by the veterinarian. Hopefully, this will help with the problem. Please let us know how this situation progresses. The Regal Swan