Meat packing should also produce a quantity of "wool", usable by the clothing industry, to represent the skinning of slaughtered animals for this purpose, maybe 1 load for each 6 loads of meat produced. This ratio is a first rough guess, we are open for discussion on this matter. The associated "tannery" could be considered to be adjacent to either the slaughterhouse or the clothing industry, it makes no practical difference.
This matter is partly addressed in the "TrainMaster" variant through the "hides" concept. However hides' and tanneries' treatment as separate entities may be adding unnecessary complexity to the transport flow. I'll probably delete them from the TrainMaster versions of my scenarios too.