I have read most oil works. Motor oil is supposed to be great. The reason I like neem oil--read about it on that natural chicken keeping blog--lots of great organic/natural stuff on there--neem oil is in the garden section at most stores, used to kill critters on roses and fruit trees, just look for the active ingredient. I think the 3-in-1 labeled stuff is one of them...cheap if you buy the concentrate, it makes tons, and you can use it all over your yard too
It kills bugs and disease and fungus, all three so it is great on quakie trees prone to blackspot/powdery mildew and roses (aphids) all kinds of stuff. Love it. You can spray it on your coop walls as well to deter the red mites.
Desert---Love the "Chicken Nerds Unite"
( That should be our slogan on here! Woot! )
That is troublesome about your new predators...you have put SOOOO much time into your flock, money, and energy. I would be hunting those things too..you just cannot afford that kind of problem. I hope others over there are willing to join in the hunt. If I lived closer I would come over and go! I hate coyotes. I had one attack my horse years back, one of my favorites and have had a grudge ever since, those and the wolves--in Idaho they are outta control. The animal rights people keep fighting for them--the wolves--they were on the endangered list for a long time and you could not even shoot one to save your herd..finally were taken off..due to so many attacks up around some property we have there...last I heard you could get a tag to kill them but only so many, they have hurt and killed people around the Challis/Salmon/Sun Valley area and the animal rights people seem to worry more about those wolves than the people, pets, and livestock that is being attacked. We had one approach us near a campground by our property..some of these wolves are gigantic, our friend killed one and held it up in a picture and this thing was twice his size, head as big as a giant pumpkin. Hard to please both sides! What to do! Crossing fingers this does not become a problem for your flock!