Different food items for rat snake?

I have a female blue beauty ratsnake that has been off feed for a couple months, i think this may be from after breeding her for the first time so i wasnt too worried. Before i fed her F/T rats and mice and she took them no problem. but after she took no interest in them. So today i tried a F/T chick and she took it with gusto. My question is what are your opinions on keeping ratsnakes on a bird diet like this? does it meet the same nutritional requirements as rodents?

Corn snakes and black rat snakes that I've kept over the years loved quail chicks. One of the corns rarely ate mice, but she always ate quail. I'm sure if you google Nutrition and feeder mice.

Here's a link for some nutritional info of feeder animals from RodentPro
http://www.rodentpro.com/qpage_articles_03.asp