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.
The comparison at hand is only to non-existence; you're not proposing any mechanism to improve such lives or to make them similar to a hypothetical nature, only to eliminate any experience of the life while still providing the meat.
As such, you don't need too much data, but you currently have none, nor even a theory about what data you'd want. Trying to determine a preference for non-existince in animals (or vegetables, for that matter, or lumps of vat-meat) when such units don't seem to have the concepts (or at least the communication ability) to make choices for themselves doesn't seem obvious at all to me.
When animals are created and destroyed solely for a purpose attributed to them by their human overlords, that reduces their utilisable preferences to zero or near zero. Unless a meat producer had reason to believe that inflicting pain on an animal improved the resulting meat product, that pain would almost certainly be a by-product of whatever the farmer chose rather than an exclusive intent. I personally know no farmers that inflict 'pointless' injury on their livestock.
Given any amount of suffering in the animal stock needed to feed, say the US compared ...
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