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Similar to other bovine type action. They'll climb on all year, but wont actually breed. Bulls bugle all year as well, but I bet the cooler weather or big weather- air change probably did get them vocal.
Elk vocalize all year long but obviously, much more when the rut actually starts as their is more to talk about (particularly the bulls).... I had a bull sing back to me at camp during my mid July scout trip to Idaho.. he was just saying hello. Ya, I think homer the spike was just going through the motions on something he thinks he's supposed to do. I seriously doubt if that cow was coming into her estrus cycle this early and if she was, she certainly wouldn't let junior breed her... it doesn't work that way.