Relationship between gonadal steroid hormones and vulvar bleeding in southern tamandua, Tamandua tetradactyla
- 1 March 2011
- journal article
- case report
- Published by Wiley in Zoo Biology
- Vol. 30 (2), 212-217
- https://doi.org/10.1002/zoo.20330
Abstract
This study aimed at demonstrating the profiles of circulating gonadal steroid hormones during the estrous cycle and pregnancy in a southern tamandua (Tamandua tetradactyla). Additionally, this study clarified the relationship between vulvar bleeding and hormonal changes. The concentrations of serum progesterone (P4) and estradiol‐17β (E2) were determined by enzyme immunoassays. Serum P4 and E2 concentrations changed cyclically and the estrous cycle length (±SD) based on the E2 cycles was 44.3±4.5 days. Vulvar bleeding started to be seen at the decreasing of P4. The cycle length for vulvar bleeding was 43.3±4.2 days. Interval from the first day of bleeding to the peak of E2 concentration was 23.1±3.1 days. Serum P4 during pregnancy remained high and E2 increased 8 weeks after conception and remained high until parturition. The female delivered normally after a 165 day‐pregnancy period and reared the offspring well. Approximately 3 weeks after parturition, serum E2 and P4 cycles resumed. Visual bleeding may be useful as a real‐time indicator for understanding the ovarian cycle of southern tamanduas, and estrus could be expected approximately 3 weeks after the first bleeding. Zoo Biol 30:212–217, 2011.Keywords
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