Progesterone and estradiol-17β as a potential method for pregnancy diagnosis in the collared peccary (Pecari tajacu)

Pedro Mayor, Diva Anelie Guimarães, Manel López-Béjar

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3 Citations (Scopus)


In this study, the period of pregnancy of nine collared peccary females has been monitored through the analysis of serum progesterone and estradiol-17β profiles. Serum concentrations of progesterone increased by Day 4 after conception, reaching concentrations of 33.4 ± 5.6. ng/mL on Day 10. Between Days 10 and 130 progesterone values were maintained between 20 and 60. ng/mL. In the collared peccary, embryonic estradiol synthesis is first observed in the systemic circulation by Day 15 of pregnancy. Between Days 0 and 50 of pregnancy, average estradiol-17β concentrations were between 0 and 30. pg/mL. From Day 75 of pregnancy onwards, estradiol concentrations were constantly increasing, reaching maximum concentrations (131.4 ± 40.8. pg/mL) on the day of parturition. The combined study of serum progesterone and estradiol-17β concentrations as a potential method for early pregnancy diagnosis presented the best overall accuracy (73%) when the threshold was established at 20. ng/mL serum progesterone and 20. pg/mL serum estradiol. Nevertheless, the accuracy for diagnosing pregnancy of females at mid and late pregnancy was 78% and 95%, respectively. The analysis of the sexual hormones during pregnancy could be a useful tool as a potential pregnancy diagnosis and an efficient predictor of the day of parturition in the captive collared peccary. © 2012 Elsevier Ltd.
Original languageEnglish
Pages (from-to)1413-1417
JournalResearch in Veterinary Science
Issue number3
Publication statusPublished - 1 Dec 2012


  • Collared peccary
  • Estradiol
  • Pecari tajacu
  • Pregnancy
  • Progesterone


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