How manyy CC would adult male silkie need to eat

[Bosky02]

Hi,
I had a wild animal get into my chicken house. After the attack, one of the male Silkies beak, top and bottom, is split in three pieces. I have been feeding him a soft diet with a needless syringe.
Can someone help me to figure out how many CC of food does that size chicken need a day and how often?
Thank you

 

[Wyorp Rock]

Welcome To BYC
I'm sorry to hear about your rooster.

You may find the article below helpful.

https://www.backyardchickens.com/articles/crop-feeding.75454/