1129 Reproductive performance with automated activity monitoring or a timed insemination program for first insemination in dairy cows
Notice bibliographique
Résumé
The objective of this study was to compare reproductive performance in lactating cows inseminated exclusively with timed artificial insemination (TAI) or with maximal use of an automated activity monitoring (AAM) system for the first insemination postpartum. From April 2014 to December 2015, a total of 998 cows in two herds in Ontario were randomly assigned to be inseminated at 85 ± 3 d in milk (DIM) following a Double Ovsynch protocol (DO), or be inseminated following detection of estrus by the AAM system between 50 and 75 DIM. In the AAM group, if estrus had not been signaled by 75 DIM, cows received the Ovsynch protocol and were inseminated at 85 ± 3 DIM. After first insemination, cows were managed according to routine herd management programs (combination of AAM and timed AI). The odds of pregnancy at first insemination and by 88 DIM were used as the outcome for logistic regression models. Models were adjusted for herd and parity as fixed effects, and interactions between treatment and covariates were tested. Analyses were done on cows that completed the protocol as assigned (completed protocol basis, n = 719) and on all cows that were not culled before first insemination (intention to treat basis, n = 849). The odds of being pregnant to first insemination were higher for cows in the DO group than in the AAM group in the intention-to-treat analysis (0.56 vs. 0.42, P = 0.05), but were not statistically significant (0.58 vs. 0.45, P = 0.12) for the completed protocol analysis. The odds of being pregnant by 88 DIM tended to be higher for cows in the AAM group than in the DO group, but was not statistically different for the completed protocol (0.74 vs. 0.59, P = 0.13) or the intention–to-treat analyses (0.70 vs. 0.56, P = 0.11).There was an interaction of treatment with herd in both models, such that more cows in the AAM group were pregnant by 88 DIM in one herd, but there was no difference in the other. In this study, the exclusive use of Double Ovsynch had a higher probability of pregnancy at first AI than AAM, but earlier insemination in the AAM group and the possibility of re-insemination resulted in no statistical difference in the proportion of cows pregnant by 88 DIM. There were differences in the relative performance of TAI and AAM between herds.
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 machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,002 |
| 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 | 0,001 | 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) | 0,001 | 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 source (Gemma direct ou Codex distillé), 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 ».