"What's the current state of GTC's capabilities in protein production with cultured goat cells."
That is a good question. Breast epithelial cells are notoriously difficult to culture, but recent advances have been made using nanofibers, which mimic the extracellular matrix. If GTC is not aware of this, they may want to contact Beth Jones at Donaldson, inc. http://www.donaldson.com/en/ecm/contactus/index.html