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Dairy Cattle Reproductive Disorders: The Importance of Low Conception Rates and Estrus Synchronization Management
Release time:
2026-08-31
Economic Impact of Reproductive Disorders
Reproductive efficiency is the core driver of economic returns in dairy farming. However, in practice, reproductive disorders in dairy cows are widespread and cause significant economic losses to farms. Issues such as low conception rates, postpartum anoestrus, ovarian cysts, and delayed ovulation not only extend calving intervals but also substantially increase feeding costs and veterinary inputs.
Major Types of Reproductive Disorders in Dairy Cows
1.Ovarian Cysts: Caused by hypothalamic-pituitary-ovarian axis dysfunction, presenting as follicular or luteal cysts, leading to repeated failure to conceive and disrupted estrous cycles.
2.Anovulatory Anoestrus: Failure of ovarian function to resume normally after calving, with no estrus signs and inability to conceive.
3.Delayed Ovulation: Normal follicular development but delayed ovulation, resulting in missed fertilization windows.
4.Subclinical Reproductive Disorders: No obvious clinical signs but persistently low conception rates—often overlooked yet causing substantial losses.
Mechanism of Action of Buserelin
Buserelin is a synthetic gonadotropin-releasing hormone (GnRH) analogue with activity similar to natural GnRH. Its mechanism of action includes:
(a) Stimulating pituitary release of gonadotropins: Buserelin stimulates the pituitary to release follicle-stimulating hormone (FSH) and luteinizing hormone (LH) into the bloodstream.
(b) Inducing follicular development and ovulation: Through induction of the LH surge, it promotes final maturation and ovulation of dominant follicles.
(c) Stimulating gonadal steroid secretion: Promotes ovarian secretion of estrogen and progesterone, creating a favorable endocrine environment for conception.
(d) Synchronizing follicular waves: In estrus synchronization protocols, buserelin coordinates the emergence of new follicular waves, enabling more cows to ovulate within a shorter timeframe.
Buserelin-Based Ovsynch Protocol
The Ovsynch protocol is the most widely used fixed-time artificial insemination program for dairy cows globally:
Day | Treatment | Dose per Cow | Notes |
Day 0 | Buserelin Injection | 10–20 μg | Initiate follicular wave synchronization |
Day 7 | Prostaglandin | PGF₂α 0.4–0.6 mg or Cloprostenol 0.5 mg | Luteolysis |
Day 9 | Buserelin Injection | 10–20 μg | Induce ovulation (54–56 h after PGF) |
Day 10 | Timed AI | — | 16–20 h after second Buserelin injection |
Clinical studies confirm: In Holstein dairy cows undergoing Ovsynch protocols, the 20 μg buserelin group showed significantly higher conception rates than the 10 μg group, demonstrating that buserelin at 20 μg can be safely and effectively applied in dairy cattle estrus synchronization and timed AI programs. The LH peak after buserelin injection occurs approximately 2 hours earlier than with natural GnRH, with hormonal changes more closely aligned with physiological estrus.
Special Value of Buserelin Under Heat Stress
Summer heat stress severely impairs reproductive performance in dairy cows—not only reducing estrus expression and affecting follicular development but also increasing early embryonic mortality. Research demonstrates that buserelin can significantly alleviate heat stress-induced reproductive damage by regulating endocrine status, increasing progesterone concentrations, and improving oocyte quality and the uterine environment, thereby enhancing summer conception rates and overall reproductive efficiency.
Conclusion
Reproductive disorders in dairy cattle are a core constraint on farm profitability, and scientifically sound hormonal intervention is a key solution. As a highly active GnRH analogue, buserelin demonstrates significant application value in estrus synchronization–timed AI, ovarian cyst treatment, and heat stress reproductive management—making it an essential tool for improving dairy cattle reproductive efficiency.
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