title: Reference serum pepsinogen concentrations in dairy cattle.
abstract: Serum samples from 27 yearling heifers and 50 lactating cows were analyzed for pepsinogen concentration. Concentrations were 44 +/- 12 (SD) ng of pepsinogen/ml (2,200 mU of tyrosine/ml) of serum for the yearling heifers and 20 +/- 8 ng/ml (1,400 mU of tyrosine/ml) for the lactating cows. These initial data indicate that a yearling calf, grazing on pasture, with a serum pepsinogen concentration greater than 68 ng/ml (2,900 mU of tyrosine/ml) should be examined for ostertagiasis.
mesh_terms: D000818:Animals; D002417:Cattle / Q000097:blood*; D002418:Cattle Diseases / Q000175:diagnosis; D005243:Feces / Q000469:parasitology; D005260:Female; D007774:Lactation; D010029:Ostertagiasis / Q000175:diagnosis / Q000662:veterinary; D010270:Parasite Egg Count / Q000662:veterinary; D010435:Pepsinogens / Q000097:blood*; D011247:Pregnancy; D012016:Reference Values; D014251:Trichostrongyloidea; D014443:Tyrosine / Q000097:blood
chemical_list: D010435:Pepsinogens; D014443:Tyrosine