I have a book also. I started with all shipped eggs. I kept a record of how many eggs I ordered from each seller and cost after shipping. I figured that into a per egg cost, but after hatch I re-did it as a per chick cost. Plus information on every egg that didn't make it to hatch and why.
I have a separate list of all birds hatch dates, names and descriptions.
I have a separate list of all birds hatch dates, names and descriptions.