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CountessFiend, no, they are plant pests only, not on livestock. You would need to make sure you properly ID them as broad mites first though, as they require harsher treatments than spider mites and such. Here's a pic of a few of them next to their eggs, this is magnified by ~100x

I know I'm pretty late on this topic, but I honestly think this looks like broad mite damage, not heat. They are tinier than spider mites and cause that heat-stress like taco in of the leaves, esp new growth. I hope its not broad mites for your sake, I hear they're a bitch.