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Notice à reprendre car pas de Clé UT au 25 Juillet 2017This study determined the immunoglobulin (A and G) activity against gastrointestinal nematodes(GIN) and also the hematological parameters in four beef-calf breeds naturally infected in a tropicalregion of Mexico. Thirty-six infected calves were used to determine the fecal nematode eggcounts (FEC), the IgA and IgG activity in serum and saliva, the packed cell volume (PCV), theplasmatic protein (PP) and the differential leukocyte counts. These parameters were measuredfor a five-month period. ELISA assay was performed using adult worm crude antigen (AW CA)from Haemonchus contortus, Trichostrongylus colubriformis, Mecistocirrus digitatus and Cooperiapunctata. The variables were analyzed using a fixed model according to the breed group. The FECrecords (means ± standard deviation) for the different breeds were: Brangus (122±115), Charolais(391±507), Guzerat (294±326) and Brown Swiss (413±395). No statistical differences (P>0.05) werefound among breeds. Cooperia and Haemonchus were the main identified genera in the coprocultures.Differences in hematological parameters were observed among breeds (P<0.01); Guzeratshowed the highest PCV (42.6±4.7%). The lowest leukocyte counts were observed in the Charolaisbreed (9.2±2.4 × 109 cells L-1). Differences between Guzerat and Charolais were only detected in eosinophils, neutrophils and lymphocytes. Increased activity of IgA was observed against M. digitatus(21% OD) compared with the response against C. punctata in serum samples (13% OD). Thelowest IgA activity in serum and saliva was found in Guzerat calves. Charolais and Brown Swissshowed the highest IgA activity in serum and the highest value in saliva was found in Brangus

annals of animal science

Comparative response of IgA and IgG activity and hematological parameters among four main beef-cattle breeds infected with gastrointestinal nematodes in the warm humid tropic of Mexico