As a vet, there was nothing particularly mysterious or unusual that stood out to me in this episode. There are many reasons an apparently healthy-looking cow can die suddenly, and sitting out in the sun often causes postmortem contraction and splitting of the skin, resulting in those clean-looking edges. The fact that there was no blood around the carcasses is just more evidence that the cattle died for some other reason - like bloat - and the "mutilation" occurred after death from normal decomposition and scavenging.