David writes:

<<Does anyone know whether casein is present in goat milk? I knew once but
can't remember.>>

  Hi David,

 It seems that casein is present in all types of milk.

Partial reference from FactMonster.com:

  The milk of the cow is most widely used by humans, but the milk of the
mare, goat, ewe, buffalo, camel, ass, zebra, reindeer, llama, and yak is
also used....

 Milk, an almost complete food, consists of proteins (mainly casein)...

Siobhan