Evaluation of a treatment protocol for intramammary infections in early postpartum dairy cows based on a positive California Mastitis Test result
Notice bibliographique
Résumé
Recent studies have evaluated the use of the California Mastitis Test (CMT) in early postpartum cows to identify intramammary infections (IMI). Whether the CMT is used to identify cows for culture or for herd-level udder health monitoring, many producers are in a dilemma when faced with a positive CMT result. The purpose of the study was to evaluate the effectiveness of an intramammary treatment protocol based on a positive CMT result within the first three days of calving. In addition, the effect of early intramammary antibiotic therapy on cure rates, linear somatic cell score (LS) and milk production for the first three Dairy Herd Improvement (DHI) tests postcalving were assessed. A total of 1861 quarters, representing 561 cows from 24 commercial herds, were enrolled. All quarters from each cow were tested by the dairy producer using the CMT, and sampled aseptically for milk bacteriology between calving and three days-in-milk (DIM). Cows with a positive CMT (n=180) were randomly assigned to receive either intramammary (IMM) cephapirin sodium, or no treatment. A CMT with any reaction was considered positive. All CMT-positive cows were sampled for bacteriological culture between 10-16 DIM to determine cure of infections. Cure rates were evaluated using data from 138 treated and 117 control quarters. Cure rates for all major pathogens for the treated and control group were 84.6 and 71.7%, respectively. This difference was not statistically significant. However, cure rates for environmental streptococcal infections for the treated and control group, 89.4 and 70.82%, respectively, were statistically different (P=0.05). Cows that recovered from infection with a major pathogen had a decrease in linear score. As LS decreased, milk production increased. When milk production was evaluated, it was demonstrated that as the CMT score increased, cows had a 2.1-kg decrease in milk production per test date. The antibiotic treatment groups were not significantly different for LS or milk production by the third test date. In conclusion, this fresh cow protocol was most effective to reduce IMI due to environmental streptococci and reduce LS. Therefore, blanket therapy of all CMT-positive cows may not be justified. Udder health status and predominant mastitis pathogen within the herd need to be considered when developing treatment protocols.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».