Since we have no live aurochs, I'm going to use stats for the Indian gaur, another very large taurine, as my base.
An auroch calf weighs about 50 lbs at birth. Based on current calf prices relative to gold, a reference of gold can purchase 15,000 head of calves. They are found in A/B/C Koppen climates.
A calf is economically useful after it's been weaned, which for aurochs is approximately 8 months. During this time, there is already a material upkeep cost because the mother's milk is gradually being replaced by solid food. This is factored as an upkeep cost even if the animal is largely grazing, because any forage the auroch gets off my land is potential food I can't grow and sell; it is a sacrificial investment. Overall, this works out to 483 pounds of food, selected by the lowest price available in the region.
Once the calf is weaned (about 200 lb), its food uptake is significantly increased. The animal will eat about 2% of its body weight per day for the next 2 years and 4 months (more or less). This is 23,679 pounds of food up to its full weight (2,500 lb).
Each of these costs is mixed with the labor of local herdsmen, which increases the cost somewhat. However, herdsmen are usually in good supply and so the added labor cost is generally low.
This makes a full-grown auroch quite valuable (depending on the cost of feed). This cost will be used to determine the local costs for meat, leather, horn, and bone glue (and perhaps other things, but these are the most important for now).
Looking at the city of Kwazfulnis (population: 3896 dwarfs, 795humans, 237 halflings, 101 elves): you can get a calf for about a copper; but a weaned calf will cost you 28 sp, and a fully grown beast is 141 gp!
It's possible these prices don't make sense. I feel like every time I look at my base commodities table I see another mistake to correct. But I'm making slow progress, and I'm more concerned that the system work flawlessly (or good enough) so that updates/corrections can be made more easily.
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