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ABSTRACT. The study of the female genital system of Colt/mba /ivia (Gmelin, 1789) is part of the research on the reproductive biology of Brazilian birds. This work describes the morphological aspects of the ovary of Coillmba livia, as well as the histological differences observed in the ovarian follicles during the ovocyte maturation process. Ten Coillmba Jivia females were studied, whose ovaries had been dissected, fixed in Bouin and Helly solutions, and histologically processed for staining (Hematoxylin-Eosin; Gomori's trichromic and Weigert's technique and Gomor;'s technique for connective tissue fibers). The ovary has an irregular surface. is located in the abdominal cavity, and relates to the cranial portion of the left kidney and caudal extremity of the left lung. Histological examination shows that the ovary is covered with simple cubical epithelium, underlined by loose connective tissue that continues internally, surrounding the follicles. The ovarian follicles were described. in their different stages of development. with basis on the morphological changes occurring in the ovocyte and in the layers that surround it, in each phase of maturation. Among the follicles, groups lof cells of two distinct types. surrounded by connective tissue, are observable: clear cells with a spherical nucleus, and acidophilic cells with a slightly elongated nucleus. The studies of the ovary of Coilimba livia reveal histological similarities between this species and Coillmhina la/pacoli (Temminck,1811), whose ovaries were examined by RIBEIRO el al. (1991).

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ABSTRACT. The Columbina lalpacoli (Temminck, 1811) dove, a small bird of the order Columbiformes, is abundant throughout Brazil and interacts closely with city inhabitants. This study describes the morphological and histochemical aspects of the epididymal region and ductus deferens of this species, comparing them with those of other bird species studied. It is believed that a better understanding of the reproductive biology of Columbina talpacoli could help to solve the ecological and sanitalY problems involving these birds. KEY WORDS. Columbidae, Columbiformes, male genital, epididymis, efferent ductuli, ductus deferens Most of the reports available in the literature on the morphology ofthe male genital system of birds refer to the domestic fowl (BRADLEY 1950;LAKE 1957;MARVAN 1969;TINGARY 1971 ;KING 1979), the turkey (HESS et at. 1976; HESS & THURTON 1977), and the guinea fowl (AIRE et at. 1979), with emphasis on this system 's macroscopic anatomy and functional aspects.The morphological study of the reproductive system of Brazilian birds is relatively recent and reflects a growing concern with the potential health risks to which our population may be exposed due to its increasingly closer interaction with dove species such as the Coillmbina talpacoti Temminck, 1881, which are known to be the carriers of many diseases.This work was carried out in continuation of the studies conducted on Columbia livia Gmelin, 1879(MARUCH et at. 1995, 1996. Its purpose is to describe the histology and histochemistry of the male reproductive organs of Coillmbina talpacoti, as a contribution toward a better understanding of the morphological and functional aspects of the genital system ofthe male Columbiformes. Such information could also provide a basis for more ample discussions on the reproduction of differents species of Brazilian birds.

ABSTRACT. Histological and histochemical aspects of female cloaca of CO/l/lnba livia (Gmelin) (Columbidae, Columbiforme). The domestic dove Co/umbo livio (Gmelin, 1789) is a species well adapted to Brazil and the study of its reproductive biology is part of a broad research project on birds. This essay describes the morphological aspects of the cloaca of female CO/limbo livio, describing compartments lengthwise starting from the head such as the coprodeo, urodeo and proctodeo limited by mucosaI tolds. Each compartment of the cloaca presents its own morphological characteristics which differ one from the other in form, height and position of mucosaI projections, kinds of tissues, presence and histological aspects of glands, presence of Iymphonodus. The rectum opens into the coprodeo, the ureter opens into the oviduct and the cloacal sac opening into the proctodeo. Histochemical studies have shown the presence of glycoproteins in tissue cells and gland cells on the three segments of the cloaca. KEY WORDS. Domestic dove, morphological aspects, histochemist1y, cloaca Columba livia (Gmelin, 1789) foi introduzida no Brasil no século XVI e pertence à família Columbidae, ordem Columbiformes. Ave de pequeno porte, a pomba doméstica não apresenta dimorfismo sexual aparente, possui cabeça pequena, redonda e corpo com plumagem cheia e macia. É utilizada como fonte de alimento, além de exercer importante papel no controle biológico de pragas e insetos, bem como na disseminação de sementes (SICK 1988).A Columba livia é uma ave bem adaptada às grandes cidades e aceita pela população; o estudo de sua morfologia interna visa contribuir para a sua reprodução controlada, preservação da espécie e sua manutenção no mercado.Como parte de um programa de pesquisa amplo sobre a biologia reprodutiva de aves brasileiras, ou aqui introduzidas, o presente trabalho descreve aspectos histológicos e histoquímicos da cloaca da pomba C. livia.A cloaca de aves é uma cavidade comum aos sistemas digestivo, urinário e genital e apresenta estrutura complexa, constituída de três compartimentos, definidos, cranio-caudalmente, como coprodeo, urodeo e proctodeo (GETTY 1986).O conhecimento da morfologia da cloaca de Columbiformes possibilitará o estudo comparativo entre outras espécies de aves. (GOMaR! 1952), para fibras reticulares.Para demonstração de componentes químicos produzidos nos diferentes compartimentos da cloaca foram utilizados os métodos do periodic acid Schif! (PAS) e a/cian b/ue (AB) a pH 0.5 e 2.5 (LlLLlE 1954).Os resultados foram analisados, descritos e fotografados ao microscópio Leica DiaStar. RESULTADOSA cloaca de Co/umba livia apresenta-se constituída de três compartimentos, coprodeo, urodeo e proctodeo, cujas paredes são constituídas de mucosa, submucosa, muscular e adventícia, apresentando diferenças morfológicas e funcionais, dependendo do segmento observado.O coprodeo, segmento cranial da cloaca, é o mais dilatado dos três compartimentos e apresenta, lateralmente, a abertura do reto. Caudal mente, o coprodeo limita-se com o urod...