Changes of serum enzyme activities in cows with milk fat depression.
Serum activities of sorbitol dehydrogenase (SDH), lactate dehydrogenase (LDH), gamma-glutamyltranspeptidase (gamma-GT), and alkaline phosphatase (ALP) were measured before, during, and after milk fat depression in 9 cows fed a high-concentrate ration during 2 experiments. In 7 of the 9 cows, increases in serum SDH and LDH activities were observed during milk fat depression. The gamma-GT activity showed only moderate changes, whereas the ALP activity remained unchanged. During recovery from milk fat depression, decreases of SDH, LDH, and gamma-GT activities were found in nearly all cows. Association of this phenomenon with changes found in beef cattle, such as ruminal lesions and liver abscesses, are discussed.
D000469:Alkaline Phosphatase / Q000097:blood; D000821:Animal Feed; D000818:Animals; D002417:Cattle / Q000378:metabolism*; D002418:Cattle Diseases / Q000097:blood / Q000201:enzymology* / Q000473:pathology; D005260:Female; D007064:L-Iditol 2-Dehydrogenase / Q000097:blood; D007770:L-Lactate Dehydrogenase / Q000097:blood; D050356:Lipid Metabolism; D008099:Liver / Q000473:pathology; D008892:Milk / Q000378:metabolism*; D011247:Pregnancy; D005723:gamma-Glutamyltransferase / Q000097:blood
D007064:L-Iditol 2-Dehydrogenase; D007770:L-Lactate Dehydrogenase; D005723:gamma-Glutamyltransferase; D000469:Alkaline Phosphatase