title: Early variations of blood plasma gamma-glutamyl transferase in newborn calves--a test of colostrum intake.
abstract: Fourteen newborn calves had low gamma-glutamyl transferase catalytic activity concentration in blood plasma (10 to 31 U/liter). Colostrum intake induced a dramatic increase of plasma gamma-glutamyl transferase activity, which was maximal on the 1st or 2nd day (370 to 5000 U/liter) after birth; then plasma enzyme activity slowly decreased and was stable about 100 U/liter on the 20th day. In two calves given either boiled or synthetic milk, plasma gamma-glutamyl transferase activity was not higher than 25 U/liter. Gamma-glutamyl transferase activity of blood plasma in newborn calves is an easy and inexpensive test of colostrum intake.
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D001798:Blood Proteins / Q000378:metabolism; D002417:Cattle / Q000097:blood* / Q000378:metabolism; D003126:Colostrum / Q000378:metabolism*; D005526:Food, Formulated; D008892:Milk / Q000378:metabolism; D005723:gamma-Glutamyltransferase / Q000097:blood*
chemical_list: D001798:Blood Proteins; D005723:gamma-Glutamyltransferase