Note the risk for copper poisoning in sheep.

In institutes where sheep are used for laboratory purposes, the common use of commercial pellet food increases the risk of copper intoxication, as the mineral supplement in sheep pellets is equal to that used for cattle, and consequently too high. Therefore we strongly urge that this kind of food should be given in very restricted quantities to sheep, particularly those kept for laboratory purposes. It is also our opinion that sheep pellets with a much lower copper concentration should be commercially available.