title: Evaluation of serum enzyme activities as predictors of passive transfer status in lambs.
abstract: OBJECTIVE
  To determine the associations between serum IgG concentration and serum activities of gamma-glutamyltransferase (GGT), alkaline phosphatase, aspartate aminotransferase, alanine aminotransferase, lactate dehydrogenase, and pseudocholinesterase for the potential use of these serum enzymes as predictors of passive transfer status in neonatal lambs.
  
  
  METHODS
  Prospective observational study.
  
  
  METHODS
  47 Sardinian lambs from birth to 2 days old.
  
  
  METHODS
  Serum enzyme activities were measured by use of commercially available kits and a clinical biochemical analyzer. Serum IgG concentration was determined by single radial immunodiffusion. Associations between serum IgG concentration and the activity of each serum enzyme were established by use of regression analysis.
  
  
  RESULTS
  A significant correlation was detected between serum IgG concentration and serum GGT activity in 1- and 2-day-old lambs. Minimal correlations were detected between serum IgG concentration and serum alkaline phosphatase activity in 1-day-old lambs and serum pseudocholinesterase activity in 1- and 2-day-old lambs. No significant associations were detected between serum IgG concentration and serum activities of aspartate aminotransferase, alanine aminotransferase, and lactate dehydrogenase. A multiple linear regression model was accurate for the estimation of the natural logarithm of serum IgG concentration as a function of the natural logarithm of serum GGT activity and of the age of lambs at the time of sampling (adjusted R2 = 0.89). This model was then used to calculate the serum GGT activity equivalent to various serum IgG concentrations for 1- and 2-day-old lambs.
  
  
  CONCLUSIONS
  Results suggested that passive transfer status in neonatal lambs can be successfully predicted by measurement of serum GGT activity but not by measurement of the other enzymes tested.
authors.affiliation: Department of Veterinary Clinical Sciences, School of Veterinary Medicine, University of Teramo, Viale E Crispi 212, I-64100 Teramo, Italy.
authors.forename: Domenico
authors.initials: D
authors.lastname: Britti
authors.forename: Genesio
authors.initials: G
authors.lastname: Massimini
authors.forename: Angelo
authors.initials: A
authors.lastname: Peli
authors.forename: Alessia
authors.initials: A
authors.lastname: Luciani
authors.forename: Andrea
authors.initials: A
authors.lastname: Boari
mesh_terms: D000410:Alanine Transaminase / Q000097:blood / Q000378:metabolism; D000469:Alkaline Phosphatase / Q000097:blood / Q000378:metabolism; D000818:Animals; D000831:Animals, Newborn / Q000097:blood / Q000276:immunology*; D000833:Animals, Suckling / Q000097:blood / Q000276:immunology*; D001219:Aspartate Aminotransferases / Q000097:blood / Q000378:metabolism; D002091:Butyrylcholinesterase / Q000097:blood / Q000378:metabolism; D003126:Colostrum / Q000737:chemistry / Q000276:immunology*; D007112:Immunity, Maternally-Acquired; D005779:Immunodiffusion / Q000662:veterinary; D007074:Immunoglobulin G / Q000097:blood* / Q000276:immunology; D007770:L-Lactate Dehydrogenase / Q000097:blood / Q000378:metabolism; D011446:Prospective Studies; D012044:Regression Analysis; D012756:Sheep / Q000097:blood / Q000276:immunology*; D005723:gamma-Glutamyltransferase / Q000097:blood* / Q000378:metabolism
chemical_list: D007074:Immunoglobulin G; D007770:L-Lactate Dehydrogenase; D005723:gamma-Glutamyltransferase; D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase; D002091:Butyrylcholinesterase; D000469:Alkaline Phosphatase