In-vitro meat reduces suffering, but also reduces joy and brain-experienced life in general. I don't know how to evaluate if a current cow or chicken's life is negative value (to the animal) or not.
If I'm exclusively limiting myself to animals that are raised in an organised fashion for eventual slaughter, I don't think I need too much data to assign broadly negative values to lives that are unusually brutish, nasty and short compared to either non-existence or a hypothetical natural existence.
In my consideration, simple things like the registering of a pain stimulus and the complexity of behaviour to display distress are good enough indicators.
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