Jacob, M. E.; Fox, J. T.; Narayanan, S. K.; Drouillard, J. S.; Renter, D. G.; Nagaraja, T. G. (United States of America)
Journal of Animal Science (2008)
370 crossbred yearling heifers were allotted into 54 pens. The study was a randomized complete block design with a 2x3 factorial treatment arrangement (9 pens per treatment). Wet corn distillers grains with solubles were included at 0% or 25%, antimicrobial feed additives were the second factor, included as none, monensin (Rumensin, 300 mg/animal/day) alone or monensin and tylosin (Tylan, 90 mg/animal/day). Pens were blocked in a series of 6 sequential pens and treatments randomly allocated within each block.
Fecal samples were collected rectally from each animal on day 122 and 136 of the finishing period. Each fecal sample was cultured for E. Coli, additionally pooled samples (by pen) were cultured for E.coli, Salmonella and Enterococcus.
AST Method: None
Reference explicitly reports AST breakpoints: Uncertain
Reference reports using a MIC table: False
Is Excluded: False
| Country | Sub-Region | Sub-Region Detail |
|---|---|---|
| United States of America | Kansas (State) | None |
| United States of America | Kansas (State) | None |
| ID | Note | Resolution |
|---|
| Title | Host | Host | Production Stage | Description | ROs |
|---|---|---|---|---|---|
| Antimicrobial Use | Cattle | Heifers | Farm | Monensin was administered in feed at a rate of 300mg/animal/day and tylosin fed at a rate of 90mg/animal/day as Tylan premix. | 3 |
| Antimicrobial Use | Cattle | Heifers | Farm | Monensin was administered in feed at a rate of 300mg/animal/day and tylosin fed at a rate of 90mg/animal/day as Tylan premix. | 1 |
| Antimicrobial Use | Cattle | Heifers | Farm | Monensin was administered in feed at a rate of 300mg/animal/day and tylosin fed at a rate of 90mg/animal/day as Tylan premix. | 1 |
| Monensin & Tylosin use | Cattle | Beef Heifers | Feedlot | Cattle fed feed additives monensin (Rumensin 300mg/animal/day) + tylosin (Tylan 90mg/animal/day) | 2 |
| Monensin use | Cattle | Beef Heifers | Feedlot | Cattle fed feed additive monensin (Rumensin 300mg/animal/day) | 2 |