I only quoted those two supplemental notes as they related to peas etc. The main text in the pdf file has the principal advice, which, for convenience, I copy here:While alfalfa in meal or pellet form is okay for chickens it's hardly a protein boost at around 15%.
Fish meal yes.
I can't see anything in the heritage feeding options that is going to give a low fat healthy high protein ration except the fish meal.
"Feed requirements: Heritage breeds of chicken (especially heavy or dual purpose breeds) require a more nutritionally complete feed ration than their commercial counterparts, in order to fully achieve their potential size and productivity. Many of the common rations found in feed stores are formulated for commercial hybrid birds which are selected to grow well with less protein in their diets. Often producers can find appropriate levels of protein for Heritage chicks in game bird or turkey starter and grower diets. To best manage the nutritional requirements of Heritage chickens the following feeding schedule is recommended:
Hatch to 8 weeks of age: approximately 26-28% protein content game bird starter ration.
8 weeks of age to 12 weeks of age: approximately 22-24% protein content game bird grower ration.
12 weeks to until point of lay (24 weeks): approximately 18-20% protein content layer/broiler grower ration.
Point of lay (24 weeks) to end of laying cycle: approximately 16-18% protein content layer ration.
A little higher protein content keeps the bird healthier in times of heat/cold stress, and better maintains condition of the heavier bodied heritage laying hens. The layer ration has a higher calcium percentage than the grower ration at a max of 8% and a minimum of 5%.
Breeder ration: When collecting eggs for hatching from breeding stock attention to detail in nutrition is especially important and the addition of a nutrient/probiotic supplement can assist in increasing fertility and hatchability. Overall, feeding the breeder flock should fall into the general guidelines for the layer flock at approximately 16-18% protein content layer ration, with calcium at a max of 8% and a minimum of 5%."
I hope the idea that ordinary chicken layer feed is a 'complete balanced ration' suitable for all backyard chickens - many of which are not high production breeds -will be laid to rest soon.