GnRH Agonist Applications in Veterinary Reproductive Management
Summary
Gonadotropin-releasing hormone (GnRH) agonists have emerged as versatile tools for the non-surgical management of fertility across a range of domestic and wild species. By delivering a sustained release of synthetic GnRH analogues, these devices provoke an initial surge in luteinising hormone and follicle-stimulating hormone—often termed the flare effect—followed by receptor downregulation and prolonged suppression of gonadal activity. In companion animals such as dogs and cats, deslorelin implants offer reversible contraception, postponement of puberty and temporary suppression of oestrus or spermatogenesis. Similar strategies have been trialled in captive wildlife and zoo populations to control breeding, mitigate aggression and reduce inbreeding without resorting to permanent sterilisation. Key considerations include individual variability in duration of suppression, management of transient oestrus induced by the flare effect and choice of implant dose and placement site. Collectively, these approaches deliver a pharmacological alternative to surgery, with global significance for welfare, population management and conservation initiatives.
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GnRH Agonist Applications in Veterinary Reproductive Management publication trend
The graph below shows the total number of articles in gnrh agonist applications in veterinary reproductive management across all publications each year (not limited to Nature Index journals).
Technical terms
GnRH agonist: Synthetic analogue that initially stimulates and subsequently downregulates GnRH receptors, leading to suppression of gonadal hormone release.
Deslorelin implant: Biodegradable subcutaneous device engineered to release a GnRH agonist over an extended period for reversible fertility control.
Flare effect: Short-term increase in gonadotrophin or sex steroid secretion immediately following GnRH agonist administration.
Downregulation: Desensitisation of pituitary receptors and diminished hormone secretion after prolonged exposure to a GnRH agonist.
References
- Prepubertal Use of Long-Term GnRH Agonists in Dogs: Current Knowledge and Recommendations. Animals (2022).
- What Happens in Male Dogs after Treatment with a 4.7 mg Deslorelin Implant? II. Recovery of Testicular Function after Implant Removal. Animals (2022).
- Duration of efficacy and effect of implant location in adult queens treated with a 9.4 mg deslorelin subcutaneous implant. Theriogenology (2024).
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