8 PREGNANCY RATE FOLLOWING TIMED AI IN BEEF HEIFERS TREATED WITH CUE-MATE AND pLH OR GnRH
Notice bibliographique
Résumé
The objective was to investigate the use of Cue-Mate and porcine LH (pLH) or GnRH with or without presynchronization on pregnancy rate following timed AI (TAI) in Angus heifers ( n = 462). Approximately half of the heifers (Control; n = 236) were treated at random stages of the estrous cycle, and the other half (Presynch; n = 226) received two injections of 500 µg cloprostenol (PGF: Estrumate®; Schering Plough Animal Health, Pointe-Claire, Quebec, Canada) 14 days apart; synchronization treatments were initiated 11 days after the second injection of PGF. On Day 0, heifers received an intravaginal progesterone device (Cue-Mate; Bioniche Animal Health, A/Asia Pty, Armidale, Australia) and were treated with 100 µg GnRH IM (Cystorelin®; Merial Canada Inc., Victoriaville, Quebec, Canada; n = 233) or 12.5 mg pLH (Lutropin-V®; Bioniche; n = 229). On Day 7, Cue-Mates were removed and heifers were given PGF IM. GnRH or pLH (same as the first treatment) was given concurrently with TAI on Day 9 (54–56 h after PGF) with frozen–thawed semen of one of 3 sires. Ultrasonographic examinations were performed in a subset of 182 heifers on Days 0 and 7 for CL and follicle development, and in all heifers on Days 41 to 49 for confirmation of pregnancy. Data were compared using CATMOD procedures in the Statistical Analysis System (SAS Institute, Inc., Cary, NC, USA). The proportion of cycling heifers on Day 0 was 90.7% (165/182). Pregnancy rate tended to differ among bulls (46.7, 56.9, and 61.4% for Bulls A, B, and C, respectively; P = 0.1). Heifers that ovulated in response to the first GnRH or pLH injection had a higher pregnancy rate than those that did not ovulate (66.3 vs. 51.9%; P = 0.03). In addition, heifers treated with GnRH tended to have a higher ovulatory response to the first treatment and a higher pregnancy rate to TAI than those treated with pLH (60.9 and 60.5% vs. 50.0 and 52.4%, respectively; P = 0.09). Although ovulatory response to the first GnRH or pLH treatment was 46.5 and 63.5% for Control and Presynch groups, respectively ( P = 0.02), pregnancy rates did not differ (59.8 vs. 53.1%; P = 0.2). However, there was an interaction between presynchronization treatment and ovulatory response to the first injection of GnRH or pLH on pregnancy rates ( P = 0.02). The pregnancy rate was higher in Control heifers that ovulated (77.5%) to the first injection of GnRH or pLH than in Control heifers that did not ovulate (52.2%) or Presynch heifers that did (59.0%) or did not (51.4%) ovulate. In summary, Cue-Mate-treated heifers that ovulated in response to the first GnRH or pLH treatment had higher pregnancy rates to TAI. Although presynchronization with PGF increased the ovulation rate, it did not significantly affect the pregnancy rate.
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 | 0,000 | 0,000 |
| 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) | 0,001 | 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 ».