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Alterations in bovine neutrophil function during the periparturient period
1989
Kehrli, M.E. Jr | Nonnecke, B.J. | Roth, J.A.
Neutrophils from 8 Holstein heifers were evaluated for function during the periparturient period. Random migration, ingestion of bacteria, superoxide anion production, native (nonenhanced) chemiluminescence, iodination, and antibody-dependent, cell-mediated cytotoxicity by neutrophils were determined. Foremilk samples were evaluated for bacteria. Significant (P less than 0.05) increases in random migration of neutrophils, iodination, and chemiluminescence were evident 2 weeks before parturition and then decreased dramatically by the first week after parturition. These impairments of neutrophil function after parturition may be manifested as a severe cumulative deficit in the native defenses afforded by the neutrophil.
Afficher plus [+] Moins [-]Serum distribution of iodine after oral administration of ethylenediamine dihydriodide in cattle
1989
Maas, J. | Berg, J.N. | Petersen, R.G.
Serum concentrations of iodine were determined after cattle were given ethylenediamine dihydriodide (EDDI) orally at dosages ranging from 0.0 (placebo) to 0.77 mg/kg of body weight/day. The serum iodine concentration was correlated with the dosage of EDDI. A rate of 0.11 mg EDDI/kg/day was correlated with serum iodine concentrations (20 to 80 micrograms/dl) previously found to be effective in preventing foot rot in cattle. A linear dose-response curve that was generated could be helpful in predicting dosage of EDDI if the serum iodine concentration is known.
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