I don't know y but my ovis baby died after I sat at its feet for 2 hours feeding it. It holds so few berries for so long. It had 7 berries left then boom dead. Don't let it get to low on food and have a buddy 2 help u.
There is an option to kill off a tamed ovis. If you equip a weapon or tool and you open the radial options for an ovis, you get option "slaughter" which kills the ovis instantly. I stumbled apon this wyle drowning them for there meat.