Alien Abductions and Cattle Mutilations

Alien Abductions: Thousands claim to have been abducted by aliens. Some say they have had reproductive experiments performed on them, and even been impregnated, re-abducted and had the unborn hybrid Human-Alien fetus removed from them. Others say they have had "Alien Implants" surgically removed from their limbs, or even implanted in their brain.

Cattle Mutilations: Why are cattle being senslessly slaughtered and left in the exact spot where they were last seen, having wounds which appear to have been carved with surgical precision, having the blood drained from their veins and their hooves removed. Is this phenomenon related to the Alien abduction phenomenon, or is there another explanation?