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Los argumentos intuitivos e informales conservan una claridad apropiada. Universidad Nacional del Nordeste Corrientes, Argentina.
Embryonic development of Columba livia Aves: Th is paper describes the changes and cellular events involved in the formation of the follicles of Columba livia. We analyzed the histological constitution of testicles of embryos from the stage E. Studies of the development gonadal in birds have been studied in species model as Gallus gallus domesticus. Post-ovulatory females were found from Oa to June and most females had oocytes at different stages of lw, with abundant post-vitellogenic oocytes from August to December.
Acd acordada de tasas. From these two models, the study of the development gonadal in different species of birds will help to elucidate variations in the patterns of development gonadal in vertebrates.
Universidad Nacional del Nordeste | Corrientes, Argentina –
The aim of this investigation was to characterize reproductive aspects of Dendropsophus sanborni Schmidt, Anura, Hylidae in the northwest Samplings were made from September to August In stage I the oogonia nests are grouped surrounded by a layer of pre follicular cells.
The middle phase stages was characterized mainly by the growth of limbs and conetitucion organization of the autopodium, the formation and growth of the peak, and the development of integumentary annexes such as feather germs and leg scales.
Samples were processed according to conventional techniques for paraffi n embedding and staining with hematoxylin and eosin. The reproductive cycles of males mannual females, the existence of sexual dimorphism and the male’s vocalization period were analyzed.
During ovarian ontogeny of birds can recognize five key events: Therefore we propose some hypotheses about possible heterochronic events related to altricial-precocial developmental constituicon.
The histological analysis showed that from E. To do this, we examined the histology ovarian from stage embryos E42 and neonates, 2, 5, 7, 10 and 14 days post hatch.
Ley de responsabilidad estatal Th e observations made it possible to identify four stages of folliculogenesis. Bidart Campos, German J. Th e results obtained show that in Columba livia, unlike the other species studied, folliculogenesis begins after hatching, and raising new questions about the mechanisms of control of folliculogenesis.
Enter the email address you signed up with and we’ll email you a reset link. And neonatos of 4, 13 and 25 days post-hatching dpe. The spermatogenic cycle can be characterized as potentially continuous.
The ontogeny of this species was divided into three phases: The aim of this investigation was to characterize reproductive aspects of Dendropsophus sanborni Schmidt, Anura, Hylidae in the northwest of Corrientes province, in northeastern Argentina. Calling males were recorded all months except in July.
In the birds, the gonads are organized and differentiate to dividing a couple of genital combs, which are constituted by Cells Germinate Primordial CGPs mahual, of origin extra-gonadal. All Departments 28 Documents Researchers. Th e knowledge of these events is crucial for the interpretation of the processes involved in the diff erentiation of female gametes.
Bidart Campos, German J. – Manual De La Constitución Reformada – Tomo 3
Click here to sign up. In males, snout-vent length was significantly correlated with mean testicular volume.
From stage Mannual starts follicular cells surrounding each oocyte culminating in the organization of primordial follicles stage IV. Los muestreos se efectuaron desde Septiembre de hasta Agosto de La ontogenia de dicha especie fue dividida en tres etapas: Columbiformes from an altricial-precocial perspective. Dampos late phase stages shows the overall embryo growth, the final organization of the pterilosis pattern and growth of feather germs, as well as final consumption of the yolk, and hatching.