It seems likely that gene editing techniques will soon yield strains of domestic animals that will be largely resistant to many of the more common viral and bacterial diseases that influence their species (https://www.theguardian.com/science/2018/mar/17/scientists-on-brink-of-overcoming-livestock-diseases-through-gene-editing). The technology is obviously more for the benefit of the farmers (to curtail disease-associated losses) rather than for the benefit of the animals themselves. It could, however, reduce the numbers of animals that are bred for meat-eating as breeders would not have to attempt to compensate for traditional losses.
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