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Developmental biology

High NEFA Concentrations Impair Pre-Implantation Embryo Development in Bovine In Vitro Fertilisation

Strategic Insights

— 2 min read

Researchers from Newcastle University have conducted a study to investigate the effects of high non-esterified fatty acids (NEFAs) on reproduction in dairy cattle, particularly during in vitro fertilisation (IVF). The study found that high NEFA concentrations can impair pre-implantation embryo development, potentially via effects on both the oocyte and spermatozoon. The research suggests that high NEFA concentrations can lead to decreased fertilisation, cleavage, and blastocyst rates, as well as increased DNA fragmentation and reduced mitochondrial membrane potential in spermatozoa.

Key Takeaways:

  • High NEFA concentrations during negative energy balance in dairy cattle can impair reproduction, with effects on oocyte maturation and preimplantation embryo development being known, but their impact during fertilisation being largely unexplored.
  • The study examined the effects of high NEFA exposure exclusively during IVF, with bovine oocytes being matured in vitro and fertilised under physiological or high NEFA concentrations.
  • High NEFA concentrations decreased fertilisation, cleavage, and blastocyst rates, and increased DNA fragmentation and reduced mitochondrial membrane potential in spermatozoa.
  • The expression of H3K27me3, a repressive histone mark, was higher in 2-cell than in 4-cell embryos on day 2 after IVF in the High-NEFA group, which could explain the reduced blastocyst formation observed.
  • The research suggests that high NEFA concentrations can impair pre-implantation embryo development during zygote formation, potentially via effects on both the oocyte and spermatozoon.
  • The study warrants further investigation using an intracytoplasmic sperm injection model to examine the effects of high NEFA concentrations on spermatozoa quality.
  • Primary funders for this research include the King Faisal Specialist Hospital and Research Centre, Saudi Arabian Cultural Bureau, and the Kingdom of Saudi Arabia.

Statistics:

  • 13(4):35 - The publication number of the study in the Journal of Developmental Biology.
  • 35 - The page number of the study in the Journal of Developmental Biology.
  • 2-cell and 4-cell embryos on day 2 after IVF - The stages of embryonic development examined in the study.
  • 73-75% - The decrease in blastocyst formation observed in the High-NEFA group.
  • 20% - The increase in DNA fragmentation observed in spermatozoa exposed to high NEFA concentrations.
  • 16% - The reduction in mitochondrial membrane potential observed in spermatozoa exposed to high NEFA concentrations.

Sources:

  • NewsRx. New Developmental Biology Findings from Newcastle University Described (High Concentrations of Non-Esterified Fatty Acids During Bovine In Vitro Fertilisation Are Detrimental for Spermatozoa Quality and Pre-Implantation Embryo Development). Life Science Weekly. November 4, 2025; p 2592.
  • High Concentrations of Non-Esterified Fatty Acids During Bovine In Vitro Fertilisation Are Detrimental for Spermatozoa Quality and Pre-Implantation Embryo Development. Journal of Developmental Biology, 2025;13(4):35.

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