How much of the B complex are you giving her and how often?
According to poultryDVM phosphorus dosage for ducks is 0.4% of their diet
Dosage of vitamin D for ducks is 3000 iu/kg
That site only has information for ducks and chickens, ducks like geese have higher nutritional requirements than...
Human grade vitamins are fine, there are a lot of brands to choose from. Powder form or capsules can be hidden in treats or stuffed down her throat. Poultry nutri-drench and rooster booster poultry cell are decent liquid multivitamins, you’ll need a syringe to administer them orally because the...
My guess is that it’s rickets, she needs vitamin D, D3, phosphorus, or calcium. I know you were feeding them a decent feed while they were goslings with added vitamins, I’m not sure what you’re feeding them now but I’m thinking that she may have had some sort of metabolic issue since hatching...
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Is this the same goose that had wide hips?