Sorry to hear about your loss! I have the same concern as we are getting polluted with coyotes. We are not calving yet and we have not had any issues with coyotes killing calves for over 10 years. I lost 3 newborns about 10 years ago. Everything was fine until I fed the cows hay that morning. When I went back to check for more new calves a couple hours later, I found the three new babies dead with their guts eaten out. I think the mothers walked over to eat some hay and left their babies for a few minutes, and the coyotes took the opportunity to kill and eat them.
I have seen coyotes walking right through our yard, and it seems that they seem to know when you have not got a gun close by. I even found a coyote curled up in a box stall in the barn on a cold night last winter. He didn't see the light of day. A week ago tonight, we had a tragic thing happen. My wife has a Silky terrier house dog that she has shown throughout Canada and the US. Carrie was undefeated in class and was both US and Canadian champion in her show days. Last Friday night we let her,and our other dog outside and Carrie ( who never leaves the immediate yard) did not return. My wife and I looked for 5 hours and then started again at first light the next morning. It did not take me too many minutes in the light of day to find some pools of blood near our barn. That is where she lost her life to the coyotes. I'm concerned that they may want to try to take some calves seeing it was within a few feet of where we calve most of our cows.
We have 3 donkeys but we have been told, by donkey breeders, that donkeys work best when there is only one of them. From what we have been told, when there is more than one donkey in the same pen or pasture, they will stand together when coyotes approach and will only defend themselves if they are attacked. That seems to be how our 3 donkeys act, as i have seen coyotes in the pasture with them and they are always standing together facing the coyotes. We used to have a mule and he was visious with most anything that entered his pen. I have seen him almost destroy a coyote who entered his pen. The problem with our mule was that he did the same thing if a dog or cat walked into his pasture as well. They are like lightning with their feet and I don't think most any animal would have much chance of getting away if he took after it.