The amount one gives is based on crop volume.I was reading through the tube feeding instructions threads again today and got myself more confused about how much to feed. I saw no more than 23 ml per pound of body weight 2-4x daily. But I think Majestic Waterfowl said no more than 90 ml daily for a duck weighing 6-9 lbs. I'm guessing the "no more than" is because the formula is very nutrient rich and their body can only process however much at a time? Obviously not wanting to overstuff their crop too. I don't want to underfeed her but don't want to make her sick from feeding too much too often either. At least she's still drinking well on her own.
Most crops can hold 5% of their body weight, but you want to start off with 2-3% depending on how sick they are, and build up to 5%.
A one pound is 454 grams
2% of 454 grams = 9.08 ml (round up to 10)
3% of 454 grams = 13.62 ml (round up to 14)
5% of 454 grams = 22.7 ml (round up to 23)
A five-pound duck weighs 2272 grams.
2% of 2272 grams = 45.44 ml (round up to 46)
3% of 2272 grams = 68.16 ml (round up to 69)
5% of 2272 grams = 113.6 ml (round up to 114)
I just looked at the Majestic Waterfowl site, and it is wrong! If you follow their suggestion, your bird will lose weight.
Tube/Syringe Feeding Dosages
After taking a sick or injured duck or goose without an appetite to your vet for an exam, they may decide some assisted-feeding is in order. Vets will commonly handle tube feedings themselves (especially in the short term) and advise you to administer syringe feedings to your pet.
Duck (average weight 6-7 lbs):
Tube Feeding: 30 mls per each meal, 2-3 times a day.
Syringe Feeding: You can administer less than 30 mls per feeding and offer more meals throughout the day as long as you top out between 60-90 mls in a 24 hour period. Do NOT go over 90 mls in 24 hours.
Goose (average weight 12 lbs):
Tube Feeding: 60 mls per each meal, 2-3 times a day.
Syringe Feeding: You can administer less than 60 mls per feeding and offer more meals throughout the day as long as you top out between 120-180 mls in a 24 hour period. Do NOT go over 180 mls in 24 hours.
http://www.majesticwaterfowl.org/mmissue76.htm