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What is really tough to gauge is how many deer there are in an area. They can cover a few square miles pretty easy. I have bucks that disappear during season and other bucks that just appear out of nowhere during season.
There is a plant called winterfat. It will grow easily in mule deer areas and is long lived. It is a sagey looking plant that provides nutrition to all kinds of ungulates through the winter, literally where its name comes from. I'm sure you have seen it before in dryland and scabrock areas. It looks close to a few other plants also though. It gets cotton seed tufts on it is one way to tell. It's not cheap to buy seed but you can get large plugs to plant and you can divide plugs to plant smaller bunches in areas as well. https://www.naturesseed.com/winterfat/?gad_source=1&gclid=CjwKCAiA_aGuBhACEiwAly57McpXyV33AEdPVA0vYMAZi_f3OC-fBOoZhJrlISG0gldzbwzklCUQohoCW68QAvD_BwEhttps://plantsofthewild.com/product-category/shrubs-under-six-feet/winterfat/