Check out this thread:
https://www.backyardchickens.com/t/805728/go-team-tube-feeding
An average size hen will need about 30-60ml every 4-6 hours, but only if she can still sit upright. If she cannot sit upright, she really should be seen by a vet.
She also needs to be kept in a warm room or crate, 80-85 degrees would be ideal.
-Kathy
https://www.backyardchickens.com/t/805728/go-team-tube-feeding
An average size hen will need about 30-60ml every 4-6 hours, but only if she can still sit upright. If she cannot sit upright, she really should be seen by a vet.
She also needs to be kept in a warm room or crate, 80-85 degrees would be ideal.
-Kathy