When knocked out they will lose health if there is no water near. Also they wont lose food.
Put one Cake in them and the health lose will stop after they ate it. If they dont eat it by them selfes, force feed the cake, so that they wont lose more health.
After the first eaten cake they start to starve.
Starve taming doesn't work too well for 2 reasons
1. It's food bar may be small, so it may start losing health before it even gets close to tame time.
2. The cool down gap for eating cake, means that you need to factor in the eating time.
Hope this helps