We studied the structural and immunohistochemical aspects of the follicular atresia and interpreted the process of cell death in the ovary of Vanellus chilenis and Himantopus melanurus. We used five female adults of each species at the stage of gonadal recrudescence. The gonads were removed, weighed, fixed and processed with the technique of inclusion in paraffin. The sections were stained with Hematoxylin - Eosin, Trichromic Mallory, Nuclear Reaction Feulgen. The technique TUNEL was employed for marking apoptotic cells. According to the morphohistologic characteristics of analyzed atretic follicles we identified two kinds of atresia in both bird species: a) Non-bursting atresia, where follicular walls remain intact, including lipid atresia of primordial oocytes and lipid glandular atresia of previtellogenic and small vitellogenic follicles and b) Bursting atresia, characterized by the b...

Morfohistologic and quantitative aspects were studied of the ovary of the Fulica armillata during gonadal recrudescence phase. Were used 5 adult females. Morfohistologic analysis revealed the presence of numerous follicles at different stages of development and regression. The simple epithelium of granulosa cells characterized the primary oocytes and the pseudostratified granulosa cells the previtellogenic follicle, both types showed a marked Balbiani body. In the white and yellow vitellogenic follicles > 1 mm evidenced a complex follicular wall formed by the radiated area, stratified follicular epithelium and well-defined thecal enveloped, while the vitellogenic yellow > 3 mm, was observed a simple epithelium with basophilic cuboidal cells. We identified two types of follicular atresia:1)intact follicle wall or non-bursting, the involution takes place inside the follicle,comprisin...

Se estudiaron los aspectos estructurales e inmunohistoquímicos de la atresia folicular en el ovario de Vanellus chilenis e Himantopus melanurus. Fueron utilizadas cinco hembras adultas de cada especie en fase de recrudescencia gonadal; las gónadas se extrajeron, pesaron, fijaron y procesaron con la técnica de inclusión en parafina. Las secciones se colorearon con hematoxilina-eosina, tricrómico de Mallory, reacción nuclear de Feulgen y para la marcación de células apoptóticas se usó la técnica de TUNEL. De acuerdo a las características morfohistológicas de los folículos atrésicos analizados, en ambas aves fueron identificados dos tipos de atresia: a) no bursting o pared folicular intacta que comprende la atresia lipoidal (ovocitos primordiales) y lipoglandular (folículos previtelogénicos y vitelogénicos pequeños) y b) bursting con ruptura de la pared folicular (folícu...

Se estudiaron los aspectos morfohistológicos y cuantitativos del ovario de Fulica armillata durante la fase de recrudescencia gonadal. Se utilizaron 5 hembras adultas. El análisis morfohistológico reveló la presencia de numerosos folículos en diferentes estadios de desarrollo y regresión. El epitelio simple de células granulosas caracterizó a los ovocitos primordiales y el pseudoestratificado a los folículos previtelogénicos, ambos tipos foliculares exhibieron un notorio cuerpo de Balbiani. En los folículos vitelogénicos blancos y amarillos (> de 1 mm) se evidenció una compleja pared folicular formada por la zona radiada, el epitelio folicular estratificado y las envolturas tecales bien delimitadas, mientras que, en los vitelogénicos amarillos (> de 3 mm) fue observado un epitelio simple con células cúbicas muy basófilas. Se identificaron dos tipos de atresia folic...

The annual reproductive cycle of Columbina picui was studied and characterized by a structural and quantitative analysis of the ovary. Adult females were collected in Sierra de Macha (Totoral, Córdoba, Argentina) between the years 2005—2006. During the phase of recrudesence gonadal (June to March), three values maximum were determined, the first one was observed in June as a result of the first oviposition of the subadults (individual with external adult characteristics but vestigial Bursa of Fabricius presence), the remaining values were registered one in September and the other one in January, corresponding that of the mature females. The ovaric regression is initiated with the hatching, and the resting stage between April and May, in the most of the birds. Two types of atresia were identified: a) the non bursting type, with no rupture of the follicular wall, which includes lipoidal...

Structural and quantitative variations of the ovary of Patagioenas maculosa were analyzed. Thirty five adult females were captured in Department Río Primero (Córdoba, Argentina), during the reproductive cycle from 2005 -2006. Gonads were removed, weighed and fixed in formalin buffered to pH 7.0 and processed according to the technique of embedding in paraffin. In the most bird, the ovary morphohistological analyses revealed a marked development of the gonad from May to February with 4 -5 yellow vitelogenic follicle ≥ 4 mm and preovulatory follicle. The gonadal weigth increased showing the highest value in September –October,agreed with the morphological characteristic of gonadal recrudescence phase. After oviposition the few developing follicles and posovulatory follicle and abundant atretic follicle indicated the onset of ovarian regresion. In the months of March and April the ova...

Con la finalidad de caracterizar el ciclo reproductivo anual de Columbina picui se realizó el análisis estructural y cuantitativo de los ovarios de ejemplares adultos recolectados entre los años 2005—2006 en la Sierra de Macha (Totoral, Córdoba, Argentina). Durante la fase de recrudescencia gonadal (junio a marzo), se determinaron tres valores máximos; el primero en junio, resultado de la ovipostura de las hembras subadultas (plumaje de adultos y vestigios de la Bursa de Fabricius); los restantes valores se registraron uno en septiembre y el otro en enero correspondiendo al de las hembras adultas. La regresión ovárica se inició a partir de la incubación de los huevos y el reposo gonadal de la mayoría de las aves entre abril y mayo. Se identificaron dos tipos atresia folicular: a) no bursting, la pared folicular se mantiene intacta, comprende a la lipoidal (ovocitos primordial...

Structural and quantitative variations of the ovary of Patagioenas maculosa were analyzed. Thirty five adult females were captured in Department Río Primero (Córdoba, Argentina), during the reproductive cycle from 2005 -2006. Gonads were removed, weighed and fixed in formalin buffered to pH 7.0 and processed according to the technique of embedding in paraffin. In the most bird, the ovary morphohistological analyses revealed a marked development of the gonad from May to February with 4 -5 yellow vitelogenic follicle ≥ 4 mm and preovulatory follicle. The gonadal weigth increased showing the highest value in September –October,agreed with the morphological characteristic of gonadal recrudescence phase. After oviposition the few developing follicles and posovulatory follicle and abundant atretic follicle indicated the onset of ovarian regresion. In the months of March and April the ova...