This one hour video is interesting... it was presented to the Vegetarian Society of Hawaii in April 2006 by Dr John McDougall http://video.vsh.org/McDougall.html
I looked up the references in the video, and list them below to save you the effort:
You might also want to cross reference this with the work of T Colin Campbell, who points out that casein in milk is a cancer promoter.
Don't be surprised to find articles opposing this science, there is a lot of money involved in the dairy industry. Dr Campbell likes to just get on with his work and not get into controversy, but he was eventually persuaded to provide this rebuttal of the criticism. http://www.vegsource.com/articles2/campbell_china_response.htm