As pointed out at https://code.wildfiregames.com/D1351#55435 and the subsequent post, the gather_animals_stockbreeding.json technology is a must-have for everyone who intends to gather food from batch-training animals from corrals (and useless for everyone else), therefore it's better to simply deprecate the technology and reduce the base time cost of domestic animals.
D3301/rP24527 changed the costs, time, health, and food values of domestic animals.
- replaces the −25% domestic animal training time with −0.1 corral batch training time;
- renames the technology file accordingly;
- changes the corral's default <BatchTimeModifier> from 0.7 to 0.8 (same as barracks or stable);
- lowers the time cost of the goat, ship, and pig, but not of cattle, which are already much more profitable.
The food-to-time ratios with this patch are:
goat : (70 - 35) / 25 s = 1.4 sheep : (100 - 50) / 30 s = 1.667 pig : (150 - 75) / 40 s = 1.875 cattle: (300 - 150) / 60 s = 2.5