Possible Superfetation in a Female nzb Rabbit. (Oryctolagus cuniculus) Accompanying Intrauterine Development Delay (idd)

Eduardo Tena

Universidad Nacional Autónoma de México, UNAM

Braulio Hernández

Bioinvert, Biología Integral para Vertebrado

Alejandra Ibáñez

Proyecto Camina

Sergio Reyes

Proyecto Camina

Alejandra Zúñiga

Instituto Nacional de Cardiología Ignacio Chávez

Verónica Graullera

Instituto Nacional de Cardiología Ignacio Chávez

Reproductive disorders among rabbits are complex and numerous, including such rare disorders as Superfetation (sf). A possible case of sf that was accidentally discovered is described, associated with dystocia in a female nzb breed rabbit, suffering from severe vaginal hemorrhaging, prostration, hypothermia and lack of reaction to stimuli. During palpation, numerous fetuses were detected in both uterine horns that did not respond to obstetric manipulation for extraction. An emergency cesarean section revealed six fetuses; the largest was dead in a caudal position, blocking the birth canal near the cervix, while another less-developed fetus was outside of the right uterine horn within a litter of seven young rabbits. The mother was euthanized in extremis using sodium pentothal. Morphologically, the developed fetuses weighed 65.8, 70.7, 61.3, 68.4, 53.7 and 65.3 grams, respectively; the underdeveloped fetus weighed 19.5 grams and had abundant meconium, which was not found among the others. The total body lengths analogically determined under the cephalocaudal criterion (cc) were 10.7, 11.2, 9.9, 10.9, 8.6 and 9.2 cm, respectively, and just 3.9 cm for the underdeveloped fetus, with no evidence of malformations or infection. Based on clinical-surgical observations, the primary diagnosis was obstructive dystocia, associated with fetal underdevelopment and secondary uterine inertia. Morphological comparison of the underdeveloped fetus was postulated as superfetation along with gestation/dystocia, with no information on fetal death or maceration. The records indicate that while already pregnant, the mother was re-mated. However, it is unclear how the female experienced a second implantation and a notable delay in the maturation of a single fetus.

Keywords: coneja, distocia materna, maduración interrumpida, reproducción, superfetación
Published
2013-12-01
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How to Cite

Tena, E., Hernández, B., Ibáñez, A., Reyes, S., Zúñiga, A., & Graullera, V. . (2013). Possible Superfetation in a Female nzb Rabbit. (Oryctolagus cuniculus) Accompanying Intrauterine Development Delay (idd). Spei Domus, 9(19), 49-56. https://doi.org/10.16925/sp.v9i19.709
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https://plu.mx/plum/a/?doi=10.16925/sp.v9i19.709