coyote population follows food source available, they don't adjust for any other reason. Killing them and them having larger litters is because fewer coyotes equals more food for the remaining coyotes. In other words, killing them doesn't make them adjust litter size, abundant food or lack of food has far more impact.
So now we are to believe that coyotes don't even kill calves. They probably don't kill antelope or deer fawns either.