Abstract

TRUJILLO ARAMBURO, Luis Emilio; HENAO RESTREPO, Guillermo; GONZALEZ PEREZ, Carlos  and  RIOS GOMEZ, Jaime. SYNCHRONOUS INDUCTION OF THE ESTRAL CYCLE IN THE BLACK  GUAGUA (Agouti taczanowskii) IN CAPTIVITY. Rev. Fac. Nac. Agron. Medellín [online]. 2006, vol.59, n.1, pp.3281-3293. ISSN 0304-2847.

To induce and synchronize the estral cycle in the black guagua Agouti taczanowskii in captivity, each of six females varying from four to seven years of age were implanted with a quarter dose of norgestomet and injected with 1,25 mg of estradiol valerate. Starting on the day of the application of the implant, the diameter of the vulvar orifice was measured three times per week until day 52, and with same frequency beginning on the day the implant was removed, blood sampling was conducted to determine progesterone levels for radioimunoassay. The hormonal treatment induced and synchronized the estral cycle in three of the six treated females, which presented increases in progesterone levels ≥ 10 ng/m, preceding the opening of the vulvar orifice. The induced estral cycle had a variable duration of from 11 to 29 days. The spontaneous estral cycles, which occurred following the ones induced by the hormonal treatment, presented variable durations of from 10 to 30 days. During the course of the experiment, a negative correlation between progesterone levels and the diameter of the vulvar orifice was documented. It was concluded that the application of a norgestomet implant accompanied by an injection of estradiol valerate can induce and synchronize the estral cycle in the black guagua.

Keywords : Exotic species; fauna; norgestomet; reproduction; wild animals.

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