We use a CPA Firm for our taxes. Every year they send us a "Worksheet" (about 40 pages) onto which we put the tax year's total figures for each expense category that we use. This worksheet also contains an ongoing Asset Depreciation record which list every animal and non-animal asset we depreciate. However, this IRS set of expense "accounts" doesn't give us the detail we need for "management".
I'm a data person but I stopped trying to record every expense item for each animal individually due to time factors. Yet, it could be reconstructed.
For a more practical and useful "summary" I track Hay, Feed, Cubes, Minerals, Water, Rainfall amounts on a monthly basis for our entire herd. Then, I arrive at a monthly average "operating cost" for each Animal Unit (we periodically weigh our animals). I also plan to chart how much each cow and each bull has produced in offspring dollars sold.
If I was a little more compulsive, or had money to hire a data entry person, or a little more bored, I would do a lot of statistical things, including Chi Square Analysis, Analysis of Variance, and Regression Analysis... ;-)
I will say that there does seem to be a relationship between the protein quality of hay we feed and the amount of 20% range cubes we feed... no surprise here!
If a producer factors in all operating expenses PLUS all overhead expenses PLUS depreciation...well, that can get a little depressing... Have to write a lot of these other "costs" to a lifestyle in the country...
