Extended Brown - I have no clue. But I think:
Brown think Jumbo Brown. Think mating JB with MGold. You get JB and MG. Now mate these JB's with MG and you will get some Browns, and more MG with the brown extended into the Gold coloring. The golds will pick up some of the brown coloring. I can't explain it any better than that. Look back at my MG they have a very defined patterning in various gold and brown coloring, the brown is extended into the gold coloring.
My Jumbo Browns carry the extended brown and the recessive brown and the recessive white. I know this because I have the darker defined patterning on the MG and I get English Whites from time to time from MG x JB matings. The English Whites have the brown not the gold color pattern. The only time I get lighter MG is when I mate them with Whites. Then the body coloring is the same, but the head coloring is lighter on the males (like daddy). Now that, I have no clue as to the reason. Would have to further breed and note off spring. Maybe at a later date.
JJMR I think you are totally wrong. By the time we figure all this out, many, many, many,... generations of quail will have passed over your lips.
Giving you time to experiment with new recipes, which we want.
