Effect of Omega-3 Fatty Acids on the Ovaries of Lactating Dairy Cows During Ovsynch.
Bibliographic record
Abstract
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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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".