Estrus cycle monitoring of captive collared peccaries (Pecari tajacu) in semiarid conditions

Pesquisa Veterinária Brasileira

Keilla M. Maia¹  Gislayne C.x. Peixoto¹  Lívia B. Campos¹  José Artur B. Bezerra¹  Aracelly R.f. Ricarte¹  Nei Moreira¹  Moacir F. Oliveira¹  Alexandre R. Silva¹ 

[1] ,Universidade Federal Rural do Semi-Árido Laboratório de Conservação de Germoplasma Animal Mossoró RN ,Brazil

关键词: Estrus cycle;    Tayassu tajacu;    hormonal dosage;    ultrasonography;    Ciclo estral;    Tayassu tajacu;    dosagem hormonal;    ultrassonografia;   

DOI  :  10.1590/S0100-736X2014001100014

来源: SciELO

【 摘 要 】

Collared peccaries (Peccary tajacu) are among the most hunted species in Latin America due the appreciation of their pelt and meat. In order to optimize breeding management of captive born collared peccaries in semiarid conditions, the objective was to describe and correlate the changes in the ovarian ultrasonographic pattern, hormonal profile, vulvar appearance, and vaginal cytology during the estrus cycle in this species. During 45 days, females (n=4) were subjected each three days to blood collection destined to hormonal dosage by enzyme immunoassay (EIA). In the same occasions, evaluation of external genitalia, ovarian ultrasonography and vaginal cytology were conducted. Results are presented as means and standard deviations. According to hormonal dosage, six estrous cycles were identified as lasting 21.0 ± 5.7 days, being on average 6 days for the estrogenic phase and 15 days for the progesterone phase. Estrogen presented mean peak values of 55.6 ± 20.5 pg/mL. During the luteal phase, the high values for progesterone were 35.3 ± 4.4 ng/mL. The presence of vaginal mucus, a reddish vaginal mucosa and the separation of the vulvar lips were verified in all animals during the estrogenic peak. Through ultrasonography, ovarian follicles measuring 0.2±0.1 cm were visualized during the estrogen peak. Corpora lutea presented hyperechoic regions measuring 0.4±0.2 cm identified during luteal phase. No significant differences (P>0.05) between proportions of vaginal epithelial cells were identified when comparing estrogenic and progesterone phases. In conclusion, female collared peccaries, captive born in semiarid conditions, have an estral cycle that lasts 21.0±5.7 days, with estrous signs characterized by vulvar lips edema and hyperemic vaginal mucosa, coinciding with developed follicles and high estrogen levels.

【 授权许可】

CC BY-NC   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License