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August 19, 2025Open Access

New Insights into Photoperiod Effects on Double Ovulation Rates in Dairy Cattle. Influence of Estrous Cycle Length on such Effects

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Authors

FLFernando López‐GatiusIGI. García‐Ispierto

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Overview

This observational analysis shows that negative photoperiod increases double ovulation rates in dairy cows, suggesting hormonal influences based on cycle length.

Key Points

  • Lengthened estrous cycles were linked to higher double ovulation rates in dairy cows, demonstrating the importance of photoperiod effects.
  • The odds ratio for double ovulations was 2.3 for cows inseminated during the negative photoperiod, indicating significant differences based on timing.
  • Analysis included 748 primiparous dairy cows to assess factors affecting double ovulations and inter-estrus intervals across normal and lengthened cycles.
  • Genomic prediction values identified risks for lengthened cycles and double ovulations, highlighting the potential for genetic assessments in dairy management.

Cite This Study

López‐Gatius et al. (2025) studied this question.

synapsesocial.com/papers/68af56f4ad7bf08b1eadcda9https://doi.org/10.20944/preprints202508.1274.v1
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Association of genomic prediction for twin pregnancies with the incidence of double ovulation in primiparous dairy cows2024
  2. 2Ovarian function and endocrine phenotypes of lactating dairy cows during the estrous cycle are associated with genomic-enhanced predictions of fertility potential2024 · 8 citations
  3. 3Is prolonged luteal phase a problem in lactating Holstein cows?2024 · 3 citations
  4. 4Reproductive physiological outcomes of dairy cows with different genomic merit for fertility: Biomarkers, uterine health, endocrine status, estrus features, and response to ovarian synchronization2024 · 11 citations
  5. 5Estrogen to progesterone ratio is associated with conceptus attachment in dairy cows receiving artificial insemination after Double-Ovsynch but not estrus2024 · 2 citations