Effect of Omega-3 Fatty Acids on the Ovaries of Lactating Dairy Cows During Ovsynch.
Notice bibliographique
Résumé
Feeding fat supplements high in omega-3 long-chain polyunsaturated fatty acids (PUFAs) have been to shown to increase the reproductive performance of dairy cows. The objective of the current study was to evaluate the effect of two rumen-protected n-3 PUFA (fish oil and marine microalgae) supplements on ovarian function of lactating cows on a pasture-based feeding system during Ovsynch. Eighteen Holstein cows were blocked for parity and expected date of calving. Cows were assigned randomly within block to one of three isolipidic dietary treatments, fed from 30 d before to 100 d after calving. Six cows were assigned to the control supplement (hydrogenated plant oil; HPO), 6 to the marine microalgae (MA) supplement, and 6 to the fish oil (FO) supplement. The cows were synchronized for estrus and ovulation during Days 35-68 post-partum. Daily and twice-daily blood sampling and transrectal ovarian ultrasonography were conducted during the Ovsynch period. A validated enzyme and radioimmunoassay procedure were used to determine plasma progesterone and estradiol concentrations, respectively. Cows that calved early in the pasture season had a longer heat after the 1st Factrel injection than the cows that calved later in the pasture season (P<0.05). Heat was significantly longer in FO-treated cows compared to HPO-treated cows after the Lutalyse injection (3.0±0.5 d and 0.8±0.1 d, respectively; P<0.05); however, MA-treated cows did not significantly differ from HPO- or FO-treated cows. Ovulation was delayed in MA-treated cows compared to HPO-treated cows after the 2nd Factrel injection (1.6±0.1 d and 1.3±0.1 d, respectively; P<0.05); however, FO-treated cows did not significantly differ from HPO- or MA-treated cows. No significant differences were found among treatments for maximum preovulatory follicular size after the 1st or 2nd Factrel injection. The number of CL in MA-treated cows was higher than in HPO-treated cows at the time of the Lutalyse (2.2±0.3 and 0.8±0.2, respectively; P<0.05) and 2nd Factrel (2.0±0.3 and 0.7±0.2, respectively; P<0.05) injection; however, cows fed FO had a similar number of CL as the cows fed MA and HPO (P>0.05). Total luteal volume was not different among the treatments (P>0.05). We concluded that supplementation with n-3 PUFAs affects ovarian function in lactating dairy cows during Ovsynch. (poster)
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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 ».