Inheritance of antibodies synthesized against IBR vaccine and of complement C3 component in weanling calves Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/0r9677105

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  • Three sets of blood samples were taken from 532 beef calves of two populations at 24 to 48 h after birth, at an average age of 164 d (at time of vaccination for infectious bovine rhinotracheitis virus or IBRV) and at an average age of 224 d (60 d postvaccination). The first set of samples were quantified for IgG₁ by single radial immunodiffusion (SRID) techniques while later samples were all quantified for antibodies specific to IBRV by a kineticbased enzyme-linked immunosorbent assay (k-ELISA). The samples taken at an average age of 164 d were also quantified for complement C3 component in a SRID assay. Differences among the breeds of one population were found for serum IgG₁ level at 24 to 48 h after birth. Angus calves were significantly higher on average than Red Poll and Hereford calves. In the other population, there were no consistent differences among lines selcted for various growth traits nor did these lines differ consistently from a randomly selected control line. Age of dam influenced all immune traits measured. Calves from older dams (>3 yr old) tended to have higher mean IgG₁ concentrations and complement C3 levels than calves from younger dams (3 yr old). Calves from older cows tended to have higher mean IBRV titers at time of vaccination and had significantly lower mean titers 60 d postvaccination than calves from younger cows. Of the immune traits examined, male and female calves differed only in level of complement C3. Female calves were higher for mean C3 level than male calves. As IBRV antibody titer at vaccination increased, IBRV antibody titer 60 d postvaccination decreased (P<.05). Heritability estimates did not differ significantly from 0.
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