Mineral deficiency? Or is it toxicity?

[blackie's maiden]

PS: Forgot to add herd goats get Bryant Meat Goat pellets.at rate of 1/2 quart per goat along w/1/4 C food.grade D.E. and 1/8 C apple.cider vinegar per animal. In herd tho, hard to say how.much each actually gets but there always seems.to be a little left. Also free choice baking soda per Fias Goat Farm suggestions tho I see no evidence they eat it.