[quote]You're assuming the cause and effect. Yes, both HR and a decrease in productivity per animal happened at the same time but that does not prove a cause and effect relationship[/quote

It certainly does if you can't identify any other factor that would account for the decrease in breeding and productivity. What you are missing is that HR not only reduces the number of deer , it has another effect that should be obvious to every one with an open mind and it explains why breeding rates and productivity have decreased. Can you identify that effect?