I have no idea! I haven't ever heard of a Golden Salmon Marans, they sound beautiful. Are they dark egg layers?
Yes, the Scratch and Peck feeds are expensive. It is possible to buy the 40lb bag for the same price approx as the 25lb. which is what I do and I use it as a supplement to my regular crumble feed. I wish my local store would keep the whole grain scratch in stock so I could sprout it but I am going to try the bird seed.
I guess I'm lucky. I have a feed mill only 25 minutes away from me. If I wanted to, I could buy 50lbs bags of millet, alfalfa, oats, and all kinds of other whole grains they make the feed out of. I'm thinking about getting a bag of alfalfa when they start to molt. it's supposed to help them all molt about the same time and quickly without starving them for 2 weeks. I just couldn't starve my babies like they do in a full on forced molt.
It's middle of summer here and a bunch of my girls that weren't quite old enough to molt last fall are already starting to shed feathers. And most all my hens are bareback, it'll be nice to see them in there new clothes! Good luck with the sprouting.