Why??? Because they can and also get away with it. And they don't really have to try all that hard either. Afterall, so many of the governing powers just turn a blind eye to it anyway. I'm sure that they can justify themselves by saying - "Big deal - what's the difference - they're just animals with no feelings that are going to be killed so that they can be eaten anyway!!! So why do they need to be treated humanely??" Yup - there's the disgusting explanation.......
ETA:
BTW Eileen - kudos to your uncle and all of those like him, for his ethical method of farming. We can only hope that there are still a lot more like him out there among all of the money-grubbing enterprises that call themselves "farmers".
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