Not first hand, and the data I'm aware of are not "authentic" data but changes in 13C abundance depending on feed and/or disease status. The person to ask would be Prof Giese at the Veterinary University Hannover (Germany). His e-mail address is: <[log in to unmask] > > Does anyone out there know data for C and/or N isotopes in cow's (or > other) milk? > > Henry Schwarcz > Hope this proves to be useful. Best regards, Wolfram *********************************** Dr. W. Meier-Augenstein, CChem MRSC Senior Research Fellow University of Dundee, School of Life Sciences, OMS, Small's Wynd, DUNDEE DD1 4HN, United Kingdom Tel.: +44-(0)1382-34/5124, /4574, /4968 Fax: +44-(0)1382-34/5514 e-mail: [log in to unmask] URL1: http://www.dundee.ac.uk/biocentre/SLSBDIV6wma.htm URL2: http://www.dundee.ac.uk/anatphys/wma/meieraug.htm ******************************************************* NB Message is confidential and for recipient only: Unauthorized reading and copying may result in legal action! Opinions expressed are those of the author and not the institution. LEGAL NOTICE: Unless expressly stated otherwise, this message is confidential and may be privileged. It is intended for the addressee(s) only. Access to this e-mail by anyone else is unauthorized. If you are not an addressee, any disclosure or copying of the contents of this e-mail or any action taken (or not taken) in reliance on it is unauthorized and may be unlawful. If you are not an addressee, please inform the sender immediately.