While the halving bug is fixed, I'm wondering these are intended or bugs as well.
If I'm not mistaken, survival skill will increase the QL of materials gained from a creature, modified by its level? If so, theoretically cows, sheep, and possibly rabbits should have their materials increase in QL with survival as well. Presently they don't. Intended, or bug? Seems like they should be scaling with the rest of the creatures... even though their hides would still be not much better than a low level critter, this will keep their meats scaling properly along the lines of deer, boars, and bears. (if a bit slower due to these creatures innate low levels)
This one seems like it might be intended, but I'd thought I'd mention it anyway. Cooked meats won't increase over the QL of the raw meat. They will decrease fine based on the QL of the fire and cooking skill used, but if your cooking skill is over it, they will not increase.