For 37 birds during the winter that doesn't seem off to me at all... I'm too lazy to go count my mixed flock of peas, chickens and guineas right now but I'm in the area of 60ish total I believe and I'm going through 80-100lbs of feed a week in addition to also giving them one or two 5 gallon buckets worth of random mixed fresh vegetables, bread, fruit, yogurt, cottage cheese and whatever every day... Without the daily fresh offerings I would be going through at least 200lbs of feed a week... I also heat the coop to 37°F so they don't consume as much as if they had to endure the even cooler temps...