effects of tilmicosin phosphate, administered prior to transport or at time of arrival, and feeding of chlortetracycline, after arrival in a feedlot, on mannheimia haemolytica in nasal secretions of transported steers. | to determine effects of time of administration of tilmicosin and feeding of chlortetracycline on colonization of the nasopharynx of transported cattle by mannheimia haemolytica (mh). | 2000 | 11131584 |
effects of vaccination prior to transit and administration of florfenicol at time of arrival in a feedlot on the health of transported calves and detection of mannheimia haemolytica in nasal secretions. | to determine effects of vaccination prior to transit and prophylactic administration of florfenicol at time of arrival at a feedyard on health of cattle and colonization of the nasopharynx by mannheimia haemolytica (mh). | 2002 | 11843126 |
effect of intranasal exposure to leukotoxin-deficient mannheimia haemolytica at the time of arrival at the feedyard on subsequent isolation of m haemolytica from nasal secretions of calves. | to determine the effect of intranasal exposure to live leukotoxin (lkta)-deficient mannheimia haemolytica (mh) at the time of feedyard arrival on nasopharyngeal colonization by wild-type mh in calves. | 2003 | 12755298 |