The paper is approved but I would like some clarification on the apparent lability of antibodies in sheep - where are we at with understanding this and the follow up to the earlier observations that Cattle seem to be behaving differently? Are we going to be able to ever deliver active antibodies in sufficient numbers that they are going to impact?  On the  face of it this paper signals a significant technical risk here - I was previously under the impression that Antibodies had survived the rumen and been recoverd from Faeces - is this incorrect?  