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Well the rut is brought on by photosynthesis each year IAW Max Zahn WFDW biologist for all of the 600# GMU. It has to do with the amount of light in a 24hr period entering the rods and cone cells of an ungulates eyes. Science 101.
I don't think CedarPants was questioning the issue of sunlight having an effect on it, just the usage of term photosynthesis. Unless my science teachers were lying to me all those years.
The word you all are looking for is "photoperiodism". This is what determines the initiation of the rut, the length of daylight each day determines the cycle. The rut will happen same time each year, every year. Our observation of the activity of the rut may depend on the weather, but the actual breeding cycle does not.