Naturally occurring and melengestrol acetate-associated reproductive tract lesions in zoo canids

A. Moresco, L. Munson, Ian Gardner

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

As husbandry practices have improved, safe and effective contraception for captive wildlife management has become a necessity. Melengestrol acetate (MGA), a synthetic progestin, is highly effective and has been used in many zoo species. Long-term use of MGA has been associated with uterine lesions in zoo felids, but effects in zoo canids have not been evaluated. This retrospective study documented spontaneously occurring lesions and investigated the impact of MGA on the reproductive health of zoo canids. Reproductive tracts from adult females were submitted by US zoos to the Association of Zoos & Aquariums' Wildlife Contraception Center Health Surveillance Program. Reproductive tracts were sampled and processed for histopathologic examination following standard protocols. Microscopic evaluations were performed without prior knowledge of MGA treatment status. Prevalence of uterine lesions was evaluated and compared between MGA-treated animals (n 5 20) and control (untreated) animals (n 5 61). Common lesions within the study population as a whole included endometrial hyperplasia (predominantly cystic) (53%), hydrometra (33%), and adenomyosis (25%). Treatment with MGA was a risk factor for endometrial hyperplasia, hydrometra, fibrosis, and adenomyosis. Uterine mineralization occurred exclusively in MGA-treated animals. Results indicate that MGA contraception can lead to lesions that may permanently impair the fertility of females. Therefore, if long-term contraception of zoo canids is necessary, the use of alternate methods of reproductive control such as gonadotropin-releasing hormone (GnRH) analogs or GnRH vaccines that reduce gonadal hormone exposure should be pursued.

Original languageEnglish (US)
Pages (from-to)1117-1128
Number of pages12
JournalVeterinary Pathology
Volume46
Issue number6
DOIs
StatePublished - Nov 2009

Fingerprint

Melengestrol Acetate
melengestrol
Canidae
zoos
lesions (animal)
contraception
Contraception
Adenomyosis
Endometrial Hyperplasia
gonadotropin-releasing hormone
hyperplasia
Gonadotropin-Releasing Hormone
synthetic progestogens
Progesterone Congeners
Gonadal Hormones
synthetic hormones
animals
captive animals
female fertility
Felidae

Keywords

  • Adenomyosis
  • African wild dog
  • Canidae
  • Contraception
  • Endometrial hyperplasia
  • Hydrometra
  • Mineralization
  • Progestins

ASJC Scopus subject areas

  • veterinary(all)

Cite this

Naturally occurring and melengestrol acetate-associated reproductive tract lesions in zoo canids. / Moresco, A.; Munson, L.; Gardner, Ian.

In: Veterinary Pathology, Vol. 46, No. 6, 11.2009, p. 1117-1128.

Research output: Contribution to journalArticle

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