Abstract | OBJECTIVE: ANIMALS: 96 weanling heifers in a research feedlot facility. PROCEDURES:
Bronchopneumonia was induced by intrabronchial infusion of M haemolytica. Control heifers underwent a sham procedure. Infected heifers were treated with oxytetracycline alone or in combination with isoflupredone acetate (OXY-ISO) or with nothing. Clinical variables were recorded daily for 7 days following disease induction, and feedlot performance indices were measured over a 12-week period. RESULTS:
Infection caused a reduction in dry-matter intake and average daily gain (ADG) in heifers that received no treatment. Oxytetracycline treatment alone did not prevent reductions in feed intake and ADG during the first week after infection was induced, whereas OXY-ISO treatment did prevent these reductions. Treatment with OXY-ISO also resulted in faster clinical improvement. No significant differences were evident between the oxytetracycline and OXY-ISO groups with respect to dry-matter intake or ADG throughout the study period. CONCLUSIONS AND CLINICAL RELEVANCE:
|
Authors | Joanne Hewson, Laurent Viel, Jeff L Caswell, Patricia E Shewen, Jock G Buchanan-Smith |
Journal | American journal of veterinary research
(Am J Vet Res)
Vol. 72
Issue 12
Pg. 1613-21
(Dec 2011)
ISSN: 1943-5681 [Electronic] United States |
PMID | 22126689
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
|
Chemical References |
- Antibodies, Bacterial
- Glucocorticoids
- isoflupredone acetate
- Fluprednisolone
- Hydrocortisone
- Oxytetracycline
|
Topics |
- Animals
- Antibodies, Bacterial
(blood)
- Bronchopneumonia
(microbiology, veterinary)
- Cattle
- Dairying
- Drug Therapy, Combination
(veterinary)
- Feeding Behavior
- Female
- Fluprednisolone
(analogs & derivatives, therapeutic use)
- Glucocorticoids
(therapeutic use)
- Hydrocortisone
(blood)
- Mannheimia haemolytica
(drug effects)
- Ontario
- Oxytetracycline
(therapeutic use)
- Pasteurellosis, Pneumonic
(drug therapy, microbiology)
- Random Allocation
- Weight Gain
|