Nancy I really don't like mud. I really am not amused to step in the mud and come up in my stocking feet. Nor do I appreciate my horses dragging their tails and legs through the mud either. For mud control, I use two things.
First I use chat. A combination of sand, crushed limestone, and crushed gravels. I used that mostly for my little walking paths. Love the stuff. You put it in your muddy area, and you will not get any mud and it doesn't mix in with the mud or get lost. It sets up hard, acts in a way like concrete but also has "give" to it. It keeps the mud down. The mud does not go over it or seep through it. The down side is that it has to be referbished once a year. After about a year of rains and the elements, it will over that time period just go away.
Next I use gravel. Just regular size gravels. I have had to spread it around the barn where I can drive the truck around the barn yard, walk to the fields and not sink. I'm not finished with it yet. I need to spread very thick layers so I won't have to keep replacing it every year like the chat. I made my paths too thin last summer. I'll probably just keep using all gravels eventually and do away with the chat completely, except maybe in my isleway.
It doesn't hurt the horses to walk on it like you'd think. They're feet adapt to it. You can just spread one thin layer down and pound it down if you want to--- The first layer ----just run over a few times with your mower, 4 wheeler, whatever you have just enough to mash it but where you can still see it, and it will mash in the ground but still have enough stablity there that they won't be sinking down in it.