Our perimeter fencing consists of woven wire, and barbed wire, and some of the pens have the added protection of electric netting. The most prevalent predator in our area is the coyote. They are extremely curious and adaptable opportunistic carnivores. They will adapt to YOUR schedule. They can do far more damage, by running, chasing, maiming, and tearing your herd apart.
Deaths occur for days afterward, due to injuries and shock.
The best predator management you can use is through the use of livestock guardian animals. We use an Anatolian Shepherd, Moses, a neutered male llama, Murphy, and a great old horse named Doc that has an innate dislike for the Canis species. Many studies have been done on the use of livestock guardians, and the results have been overwhelmingly strong. We have had very good luck with our group. Each type of livestock guardian has their particular pros and cons, and their own kind of maintenance schedule.