Night of the Lepus

In Arizona there has been overpopulation of rabbits, who are causing significant agricultural damage. Rancher Cole Hillman (Rory Calhoun) invites a zoologist Roy Bennett (Stuart Whitman - Eaten alive [1977]), and asks him for help. He tries to a population of rabbits to reduce the disruption of the natural reproduction by the genetically mutated blood and hormones that injected into rabbits. Part of the test rabbits escapes and infects the rest of which will eventually become krvechtivé monsters.