How big is this fella you reckon?

Had my brothers wedding on the weekend and the place we had it bordered on to a zoo. I knew they had a few aoudad amd as luck would have it, they along with water buff and american bison where the nearest to us. I managed to get these pics from my cottage about 100m away.

Just curious, how big are these two rams? I was thinking late 20's?

http://1drv.ms/1tazD8F

Cheers,

Jack