Comparative efficacy of a novel intramammary dry cow antibiotic to eliminate subclinical mastitis in the dry period
Bibliographic record
Abstract
Although there is increasing concern over routine administration of long-acting antibiotics to all cows at the end of lactation, the practice is required to eliminate subclinical infections that are present at drying off. Alternatives to dry cow therapy (DCT) for preventing new infections from occurring in uninfected quarters in the dry period are increasingly common. However, until a cost-effective and reliable test becomes available to determine which cows and quarters are not infected at drying off, administering DCT to all quarters and all cows remains the recommended practice. The efficacy of a novel intramammary treatment containing tilmicosin, administered at drying off to eliminate mastitis pathogens other than Staphylococcus aureus, was compared to intramammary cloxacillin. Data from 406 infected quarters, representing 238 cows that either received intramammary tilmicosin or benzathine cloxacillin, were analysed. The study was conducted in Ontario, Quebec, and Prince Edward Island in Canada for a period of one year, beginning in July 1999. Results showed that 11% of quarters had a major mastitis pathogen recovered prior to the dry period. The overall cure rate of mastitis pathogens following administration of DCT was 89.2%. The cure achieved with intramammary tilmicosin was 87.2%, whereas for cloxacillin it was 90.9%. There was no significant difference in the cure rate between the 2 treatments, either in overall cure, or cure of any specific pathogen. Results of the final logistic regression models to determine factors associated with the probability of infected quarters to cure during the dry period reemphasized the importance of dry period length, season of drying off, and general environmental exposure. It is concluded that intramammary tilmicosin is as efficacious as benzathine cloxacillin for eliminating existing infections caused by pathogens other than S. aureus during the dry period. No commercial preparation of intramammary tilmicosin is currently available.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".