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Assessment of Different Sampling Procedures to Estimate the Immunoglobulin G Content of Colostrum in Dairy Cattle
Guatteo R., Le Dréan E., Turban H...
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Objectives: the aim of the study was (i) to assess the influence of different colostrums sampling procedures on the assessment of Igg content and (ii) to evaluate the influence of controlling both distribution timing and colostrum quantity on the rate of passive transfer.
Materials and Methods: to assess the influence of the type of sample, colostrums from each quarter and a composite sample (mix of 4 quarters) were concomitantly collected after calving from 78 Holstein dairy cows. to assess the variation of Igg content during the first milking, 9 cows were also sampled every minute from the start of the milking. all theses samples were tested using Idr. Between 2009 and 2010, colostrum administration was modified from no systematic control of colostrum intake to systematic records during the first 2 hours after birth. calves were allowed to receive a maximum amount of 4 liters. the rate of passive transfer was investigated based on Igg content in the calves sera 48 hours after birth and the Igg content of the colostrums of their dams were also investigated (83 cows-70 calves in 2009 and 84 cows-79 calves in 2010). Qualitative and quantitative results were analysed using student-newmann-keuls test.
Results: regardless the threshold of Igg content to consider a colostrum to be good enough, the sensitivity and the specificity were similar regardless the type of sample (individual quarter or composite milk). the mean Igg content of hindquarters (56,3 g/ l) was significantly higher than the value of forequarters (53,7 g/ l) for a mean value of composite colostrum of 54,7 g/ l. the Igg content in the colostrum did not changed significantly during milking. the small variations observed were more likely due to the laboratory method ( cV 15% also). lastly, for similar Igg content in the colostrums of the dams in 2009 and 2010, mean Igg content in the sera of the calves increased from 10,1 g/ L (just above the cut-off value to consider failure of passive transfer) in 2009 to 12,5 g/ L in 2010. the spontaneous intake of the calves in 2010 varied from 0,2 to 4 liters in the first two hours (30% of calves above 3 liters intake).
Conclusions: the assessment of the colostrum quality can be performed either on individual of composite colostrums sample collected at any time of the first milking, without affecting the reliability of the measure. given the spontaneous intake of colostrums of the calves, it should be recommended to give 2 to 4 liters in the two first hours after birth, preferably collected for the hind quarters.
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Affiliation of the authors at the time of publication
UMR Oniris-INRA BioEpAR, France
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