Keep the mud down in your animal pens. Mud is dangerous to animals because the standing water can result in an unhygienic environment that can lead to disease in your animals. If you cannot afford gravel, or sawdust or other celebrated beddings throughout your pen, there are numerous affordable alternatives that you can rely upon.
One easy remedy is newspaper. Whether you shred it or use it whole, the paper soaks up the water very well and can become integrated with the pen ground so that the next time there is a lot of snow or rain, it is less likely to become muddy. Newspaper is harmless if your animals eat it, and is good for compost when you are cleaning out your pens, making it a great affordable alternative bedding.