I've read that studies by the state of Texas (and South Carolina) indicate that out of 10 deer fawns born in the Spring, 7 will be dead by fall, with most of the dead due to coyotes. And if you think like I did that a Coyote will just kill and eat the small animals, my super-hunter cousin told me a story about last deer season in Louisiana that changed my mind. He was hunting from high up a tree, and hoping to see the big buck he had been studying, when that big buck showed up in a panic at full gallop. Two coyotes (at least two) were tag teaming the buck to wear him down so that they could kill him. The buck was in the 250 pound range. One coyote had his teeth in the buck when the buck tripped. My cousin put an arrow through that coyote. He said that the buck was exhausted.
I will, if able, kill each and every coyote I see on my place. I've been doing it for about 5 years, and the deer herd is noticeably larger and healthier now. For every deer I kill per year, I kill maybe 10 coyotes. I've noticed that when they get to howling in the evenings, the howls are not close by any more. Maybe my 220 Swift and I are making a difference.