Primos Hunting brand. Deer call. 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 bucks during the pre-rut, rut, and post-rut. Perfect for Whitetail, Blacktail and Mule Deer.