[Lactate dehydrogenase isoenzymes in the colostrum of cows].

Investigated was the isoenzyme spectrum of lactatedehydrogenase in the colostrum of cows which was obtained at various intervals after calving. It was found that the activity of lactate dehydrogenase was most effective immediately following calving when a total of 5 isoenzymes were established, which lowered their activity with the extention of milk secretion.