3Thomas, S. P., Klucinski, W., Littledike, T. Suppression of mitogenic response of bovine lymphocytes during experimental ketosis in calves[J]. American Journal of Veterinary Research, 2003,46:1378-1384.
10Shannon D. Supplementation of rmnen-pmtected forms of methionine, betaine, and choline to early lactation Holstein cows[D]. Raleigh: North Carolina State University, 2006.
