It will all depend on how many your family will eat.
We have 4 of us left in the house, but I give some to our son who lives in Rochester too on occasion. I also will have some large fowl purebred Cornish to process this year, but I can those since they are tougher for roasting birds. I will pressure cook the pure birds sometimes because those that have been out on pasture tend to be stringy and tough if they get old enough.
Anyway, we did 50 the first year and had enough to last almost 2 years, but my kids were little. Depending on how good they are, sometimes my carnivorous family will strip a 5.5# bird in one night. Other times, it barely gets touched so I use it for soup or other dishes, like Ralphie said.
This year I will be cutting up about 10 birds so we can have parts to cook in different recipes rather than just whole birds.
If you started with 25 in the Spring, or if you tried them yet this year, which there is time, then you would know how much you would need in the next batch.
I have 2 big freezers and they will both be full this fall with a half pig, the CRX, and any rabbit, beef, duck and chickens that I have left from this past year.