Good luck with kidding! Can't wait to see pics of the kids! 
Definitely a mineral deficiency. Are you in a selenium deficient area?Quick question, how do you get their horns to look so nice? When we got my Boer doe, her horns were dry and really terrible looking. There were 'layers' missing, cracked, etc. Now that she is here, they are getting better. I am assuming lack of minerals/proper feed?