First of all, thanks for the pictures. They’re adorable.
The standard recommendation for Ducks sleeping accommodation is 4 square feet per bird.
To be honest, some of my ducks have about 3 1/2 ft.² each right now and they’re fine.
So for five ducks, you would want close to 20 ft.²
What are the measurements of the dog crate?
Have you had them since they were ducklings? Did you ever supplement them with niacin?
What form of niacin did you use if so?
What kind of Feed do you have them on? Treats?
When I have a duck, that is limping, usually I give them some time out to rest and start giving them 1 ml of liquid b complex daily for a couple of weeks because it strengthens their legs.
Here’s the best kind
As you can see on the back label, it has 100 mg of niacinamide per ML. Most other supplements do not have this much.
Besides that, if you give them anything that is time released or flush free, it will not work. It will go through their system too fast to do any good.
Have you looked at the bottom of his or her feet? Check for bumble foot, that can make them limp if that is the case take a picture and post it here please.
Here are the instructions for giving the B complex supplement orally. You can also squirt it over a small dish of treats that they like such as mealworms and make sure they eat it all.
How to Safely Administer Oral Medications to Poultry and Waterfowl
Many medications are more effective when given orally instead of in the water, especially when a bird is ill because an ill bird is unlikely to drink enough medicated water. The oral administration of liquid medications in...