Ovarian follicular dynamics in does on anoestrous period after progestagen treatment / Dinâmica folicular ovariana em cabras em anestro após tratamento progestágeno

ABSTRACT

Eighteen 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

RESUMO

Dezoito cabras Anglonubiana (n = 9) e Saanen (n = 9) foram monitoradas por ultra-sonografia com o objetivo de caracterizar a dinâmica folicular após estro induzido com progestágeno durante anestro estacional. Nas duas raças o nível de progesterona alcançou valores acima de 1,0 ng.mL-1, no D3, e declinou abaixo desse valor, no D18. Entre as cabras Anglonubiana, 33,3%; 44,5 e 22,2% apresentaram, respectivamente, duas, três e quatro ondas, enquanto entre as Saanen, 87,5% apresentaram três e 12,5% duas ondas foliculares. Nas duas raças, foram verificadas diferenças entre os dias de emergência das ondas foliculares e entre os dias em que o maior folículo de cada onda atingiu o diâmetro máximo (P