How much Food?

I cut and pasted this for you. I don't do Pheasants, but the info is from a study on pheasants.

Feeding adults and chicks
After one day of age, chicks should be allowed access to game bird chick starter. The feed must be a game bird starter, since domestic chicken starters are unsatisfactory for young pheasants. The starter pellets can be scattered on paper plates until the chicks are started on feed. Green paper plates may be helpful in getting the chicks to eat, for they are attracted to the green color.

After the chicks are one week old they can be started on game bird grower. Depending on the formulation of the feed, game bird grower may be satisfactory feed until the birds reach maturity at 16 weeks. The chicks will require ½ to 1 pound of starter, which is a one-week supply, and about 10 pounds of grower, a 15-week supply, to reach mature size. Mature size for hens and roosters is 4.75 and 5.5 pounds, respectively. Grit should be sprinkled on the feed every four days, until the chicks are placed in the flyways.

An adult pheasant will require about 5.5 pounds of feed per month to maintain condition. Beginning about three weeks before egg laying begins, the hens should be fed a higher quality laying ration. Laying rations typically used for domestic pheasants may be substituted for hen pheasants at this stage. This ration should be fed throughout the laying season.

Check with your local farmers Co-Op to see if buying your feed in bulk will be cheaper. 19% Gamebird feed can be had in 100 bags for $12.91. You will cut your costs in half.

People will tell you about all the different gamebird feeds Purina, yata yata yata. It's whatever works for you.