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May 17, 2026Japanese Journal of Large Animal Clinics

Relationship between the photoperiod length and twin pregnancies under natural estrus in Holstein dairy cows

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Authors

RAR. AbeTAT. Ando

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Overview

Randomized trial examines the effect of photoperiod on twin pregnancy rates in Holstein dairy cows, indicating potential for improved fertility management.

Key Points

  • To investigate the relationship between photoperiod length and twin pregnancies in Holstein dairy cows during natural estrus.
  • Conducted from 2010 to 2020 on a free-stall dairy farm without hormone treatments or embryo transfer.
  • Assessed the twin pregnancy rates across seasons in 2,179 cows during natural estrus.
  • Included insemination analysis based on photoperiod length.
  • Identified a twin pregnancy rate of 5.0% (109 twins out of 2,179 inseminations).
  • Twin pregnancy rates were highest in winter (6.9%) and lowest in spring (3.6%), but seasonal differences were not significant.
  • Insemination during periods of less than 12 hours of daylight significantly increased twin pregnancy rates (p = 0.0072).

Cite This Study

Abe et al. (2025) studied this question.

synapsesocial.com/papers/6a095a427880e6d24efe0650https://doi.org/10.4190/jjlac.16.190
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Also Consider

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

  1. 1Double trouble: Implications and management of twinning in lactating dairy cows2024
  2. 2New Insights into Photoperiod Effects on Double Ovulation Rates in Dairy Cattle. Influence of Estrous Cycle Length on such Effects2025
  3. 3Study on inducing twin calves in beef cattle through embryo transfer technology2024
  4. 4Association of genomic prediction for twin pregnancies with the incidence of double ovulation in primiparous dairy cows2024
  5. 5Cow, Season and Disease Risk Factors Associated with Subfertility in Holstein Cows2024