Welcome to Permies!
I don't have any livestock, so I am unable to comment as to what trees are safe for them. However, if you can share some information about where in the world you are and about your climate, some experts may drop by to help you out.
What type of wind protection do you need? What is your wind speed? Is your wind predominately in the summer, or winter? (deciduous vs evergreen)
Are you in flat
land, or steep slope?
How tall do the trees need to be? Did you have any specific tree species in mind?
Basically, the more information you can tell us, the better our answers will be.