Produção Nacional
Dinâmica folicular ovariana em cabras em anestro após tratamento progestágeno
2008; UNIVERSIDADE FEDERAL DA BAHIA; Volume: 9; Issue: 4 Linguagem: Inglês
ISSN
1519-9940
AutoresJurandir Ferreira da Cruz, Dárcio Ítalo Alves Teixeira, Davide Rondina, Vicente José de Figueirêdo Freitas,
Tópico(s)Effects of Environmental Stressors on Livestock
ResumoEighteen Anglonubian (n = 9) and Saanen (n = 9) goats were monitored by ultrasonography to characterize the follicular dynamic after induced estrus by progestagen treatment during seasonal anoestrous. In both breeds, the progesterone level reached values above 1.0 ng.ml-1 at D3 and decreased below this value at D18. Among Anglonubian goats, 33.3, 44.5, and 22.2%, respectively, showed two, three and four follicular waves while among Saanen goats 87.5% showed three and 12.5% showed two follicular waves. In both breeds differences among the days of emergence follicular waves, as well among the days that the biggest follicle of each wave reached maximum diameter were detected (P>0.05). In the goats which presented three waves pattern, the emergence day of first, second and third wave occurred at days 2.0 ± 0.9; 9.3 ± 1.4 e 15.1 ± 0.8 versus 1.0 ± 0.5; 6.7 ± 0.9 e 14.6 ± 1.0 in Anglonubian and Saanen, respectively. In the early-mid luteal phase (D8 to D10) the progesterone concentration was higher in four waves goats than two and three waves goats (P<0.05). The utilization of exogenous progestagen for estrous induction, during seasonal anestrous had no effect on subsequent follicular dynamic pattern in dairy goats. However, the endogenous progesterone levels in the mid luteal phase affect the turnover of dominant follicles, consequently, interfering on the number of follicular waves.
Referência(s)