I have a mineral feeder that holds 8# of mineral for my does... I'm filling this thing every 2-3 weeks.... I use the Manna Pro goat mineral for my does and Golden Blend for my boys..the 3 boys go through 5# in the same amount of time...they have a good quality mixed hay with timothy and some alfalfa and they all get a good 18% pre mix goat grain, with 5 adult does age range 2 years to 10 years as well as an 8 month old.... is this "normal"? With the pasture mineral I used in previous years I don't recall filling the feeder so often! Is it because they just like this stuff or they really are lacking something besides the copper?