Factors associated with colostrum immunoglobulin G concentration in northern-Victorian dairy cows
AJ Phipps, DS Beggs, AJ Murray, PD Mansell, MF Pyman
AUSTRALIAN VETERINARY JOURNAL | WILEY | Published : 2017
OBJECTIVES: To determine the proportion of first-milking colostrum samples produced on four northern-Victorian dairy farms that meet industry standards in terms of immunoglobulin G (IgG) concentration and to identify risk factors that affect colostrum quality. METHODS: Colostrum IgG concentrations from 442 dairy cows on four farms were estimated using a Brix refractometer and risk factors for colostrum IgG concentration were determined using multivariable logistic regression. RESULTS: Only 39% of samples met the definition of high quality. The strongest predictor for colostrum quality was the interval from calving to colostrum harvesting. Colostrum harvested from cows within 12 h of calving ..View full abstract
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The study was supported in part by Rochester Veterinary Practice, Dairy Australia, Gardiner Foundation and the University of Melbourne, Faculty of Veterinary and Agricultural Sciences.