When the mercury is dropping and the wind is blowing a gale, most people would rather be indoors than outside braving the elements. The same is often true of livestock. I am among those who prioritize keeping all of my animals as comfortable as possible throughout all seasons, and have developed a repertoire of effective ways to keep them warm during the cold of winter. Even if your motivation to keep livestock warm is centered more on avoiding a drop in production or merely basic survival, the following list is a good reference for livestock safety in winter.
1. Time grooming and treatments with intentionality. Avoid shearing and trimming coats when cold weather is approaching, of course. But beyond that, it may not be a bad idea to limit shots, hoof-trimming, and other routine procedures in winter as much as possible. Anything that causes an animal stress can detract from the energy it uses to stay warm and healthy. I am not suggesting a moratorium on livestock handling, but only to try and do the bulk of it in late fall and early spring so as to keep it to a minimum in winter.
2. Give easy access to shelter.