Primos Hunting Calls. Primos "The Original Can" Estrus Bleats. Estrus Bleats tell bucks that a doe is ready to breed. Whitetail, Blacktail, and Mule Deer can all respond quickly and dramatically to the "quivering" doe Estrus Bleat produced by "The Original Can". This is, by far, the best call we know of to call in the bucks during the pre-rut, rut, and post-rut. Perfect for Whitetail, Blacktail, and Mule Deer. Primos Model No. 711. Primos Game Calls "The Original Can". Primos Hunting Calls.