203 EFFECT OF SUPPLEMENTAL FOLLICLE-STIMULATING HORMONE OR EQUINE CHORIONIC GONADOTROPIN DURING THE PROTOCOL FOR TIMED AI IN HIGH-PRODUCING HOLSTEIN COWS
Notice bibliographique
Résumé
Programs that allow timed AI (TAI) have been used to improve reproductive efficiency in dairy herds; however, in many cases pregnancies per AI (P/AI) during these programs remain suboptimal. In the present experiment, it was hypothesized that treatment with FSH or eCG at the time of the PGF2 treatment of the TAI protocol would increase fertility in dairy cattle. This experiment was performed in June 2008 (winter) and January 2009 (summer) on 2 commercial dairy farms located in southeast Brazil. On a random day of the estrous cycle (Day 0), 694 cows at 196 ± 138 days in milk (DIM) received 2 mg of estradiol benzoate (RICB®, Tecnopec, São Paulo, Brazil) i.m. and a releasing intravaginal device (P4; Primer®, Tecnopec), which was removed on Day 8 when 150 µg of PGF (Prolise®, ARSA, Buenos Aires, Argentina) i.m. were administered. At this time, the cows were stratified by days in milk (DIM), parity, number of insemination, milk production, presence of a CL on Day 0, and body condition score (BCS) and were randomly assigned to 1 of 3 treatments: control (n = 232), consisting of no additional treatment; eCG (n = 232), consisting of 400 IU of eCG (Folligon®, Intervet, São Paulo, Brazil); and FSH (n = 230), consisting of 20 mg of FSH (Folltropin®, Bioniche, Belleville, Ontario, Canada). All cows received GnRH (100 µg of gonadorelin; Fertagyl®, Intervet) and were TAI 56 h after the removal of the device. Pregnancy diagnosis was performed 30 and 60 days after TAI. Also, a subset of animals (n = 89) was submitted to ultrasonographic exams to evaluate the diameter of the ovulatory follicles (ØOF), time to ovulation after P4 removal (TOV), and ovulation rate (OR). Statistical analyses were performed with logistic regression by PROC GLIMMIX of SAS (SAS Institute, Cary, NC, USA). There were no interactions of treatment with DIM, parity, number of insemination, BCS, locomotion score, sire, batch, inseminator, farm, or month; therefore, these variables were removed from the statistical model. The overall P/AI was different between treatments at 30 days after TAI [control = 28.0% (65/232), eCG = 29.7% (69/232), and FSH = 18.7% (43/230); P = 0.01], but not at 60 days [control = 21.6% (50/232), eCG = 24.1% (56/232), and FSH = 16.1% (37/230); P = 0.08]. Pregnancy loss was also similar among treatments [control = 23.1% (15/65), eCG = 18.8% (13/69), and FSH = 14.0% (6/43); P = 0.08]. In addition, the treatments (control, eCG, and FSH, respectively) were not different among ØOF (13.78 ± 0.52; 14.50 ± 0.59; and 15.35 ± 0.69 mm; P = 0.15); TOV (82.50 ± 2.14; 78.48 ± 2.35; and 78.96 ± 2.39 h after P4 withdrawal; P = 0.30); or OR [82.76% (24/29); 83.33% (25/30); and 83.33% (25/30); P = 0.44]. Thus, these data do not indicate a major fertility-enhancing effect of a single eCG or FSH treatment during protocol for TAI in high-producing dairy cows, contrary to the hypothesis of the present study. Tecnopec, Fazenda Campestre, Agrindus S/A, Echoa e Nutricell Nutrientes Celulares.
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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 | 0,000 |
| 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) | 0,000 | 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 ».