From the looks of it, it is probably a copper/selenium deficiency. They work hand in hand for the over-all health of the goat.
If they were my does, knowing that they have not been recieving loose minerals and seeing how they look, I would copper bolus them now, give them a Bo-Se shot now, to start correcting the level of deficiency that can be seen before they kid out. And yes, keep your loose mineral out.
Copper is so very essential to the body functioning properly. Proper copper/selenium levels(copper and selenium work hand in hand, if you don't have enough of the one, you won't get the full benefits of either), are essential for breeding, conception, gestation, kidding, cleaning out properly, milk production, worm resistence, growth, feet health, longevity, hair, all around health.
*On average*, most goats are deficient at some level or another, some critically, more just enough to keep them from being all they can be. All should have a high copper mineral(usually a cattle mineral as most "goat" minerals aren't worth the money), many will need bolused besides.
High levels of iron and/or sulfur in food or water inhibit the proper assimilation of copper, in these areas, they will need at least a high copper mineral and probably bolusing as well.
I personally began bolusing my herd several years ago, along with a free-choice loose high copper mineral(Cargil Right Now Onyx Beef Cattle Mineral), and the use of Bo-Se(selenium) pre-breeding and pre-kidding, and the improvements have been dramatic. The goats weren't problamatic before the bolusing and Bo-Se, but after the bolusing....the change was obvious. Where I had twins before, now I got triplets and even quads. Triplets were the exception and now they are the rule. My first fresheners very rarely have singles and often they have triplets. They all clean out better, milk better, have shinier coats, better feet, breed earlier, etc, than before.
If I seem pushy, I am sorry. Just something I feel very strongly about.
