Just what you need to finish your collection of the "Barnyard Big 5" !
"The difference between adventure and disaster is preparation." "The problem with quoting info from the internet is that you can never be sure it is accurate" Abraham Lincoln
The horn in the stand might be from a big horn sheep. Without anything to judge size by, my guess is that skull is either from one of the wool sheep breeds, Merino/Rambouillet or one of the hair sheep breeds, Barbado which were derived from Mouflon/Mouflon cross.