Yeah, spreadsheet. It charts consumable expenditures, non-consumable expenditures, running tallies for both separate and a tally for those merged, date, number of eggs, flat overall cost per egg, flat overall cost per dozen, amortized cost of non-consumables + consumables running tally, the previous item cost per dozen, and feed cost per dozen.
I added the amortized cost/dozen recently. Interesting column, that is.
I don't keep track of how much any individual is laying because that'd be difficult, though I do have a general idea of how each breed is performing overall. This summer I'll separate the hens or use the food-coloring method to find out who's really laying what to set up and see if anyone needs culled at molt.