scholarly journals Morphological aspects of epididymal microscopy and rete testis in greater Rhea Americana

2021 ◽  
Vol 51 (7) ◽  
Author(s):  
Breno Nahuel Freneau ◽  
Saulo Fernandes Mano de Carvalho ◽  
Simone Maria Teixeira de Sabóia-Morais ◽  
Gustavo Eduardo Freneau
Keyword(s):  
Blood Vessels ◽  
Rete Testis ◽  
Relative Volume ◽  
Lumen Diameter ◽  
Activity Period ◽  
Rhea Americana ◽  
Greater Rhea ◽  
Morphological Aspects ◽  
Epithelium Thickness ◽  
Tubular Diameter

ABSTRACT: The purpose of this research was to study the histology and describe the microscopy findings of the epididymis epithelium of greater Rhea americana at three time periods: November 2005 (n=14), December 2006 (n= 20), and May 2007 (n= 20), to observe and compare the differences that occurred. We studied the epididymis from 54 rheas, bred in Santa Maria, Rio Grande do Sul, Brazil. The epididymis were collected during commercial slaughter and fixed in bouin. Optical microscopy was used to measure the cellular structure, types of cells, tubules, and stereological values like the epididymis epithelium diameters, lumen, thickness, and relative volume of the tissue structure. Additionally, electron microscopy was studied. In December 2006 and May 2007, the means of the epididymis tubular diameter were: 79.1 and 58.1 µm, epithelium thickness: 24.0 and 52.2 µm, and lumen diameter: 55.0 and 5.8 µm, respectively. Regarding the volumetric proportion, we reported the following values: epithelium volume 36.2 and 80.4%, lumen without spermatozoon 19.6 and 3.0%, lumen with spermatozoon 5.4 and 0.0%, interstitium 35.4 and 12.0%, blood vessels 3.5 and 4.6%, structures in cellular superficies 1.4 and 0%, lamina 1.4 and 3.2%, and artifacts 0.3 and 1.3%, respectively. The epididymis ducts had a circular form in transverse sections with spermatozoon only in November 2005 and December 2006. The Rhea’s epididymis morphology was found to be similar to ostriches, roosters, and Japanese quail. Here, we present data from stereological microscopy (tubular diameter, epithelium thickness, and lumen diameter), volumetric proportion (epithelium, lumen without spermatozoon, lumen with spermatozoon, interstitium, blood vessels, structures in cellular superficies; cilium, estereocilium, and lamina) in this species during the repose and sexual activity period (reproductive season).

scholarly journals Aspects of spermatogenesis and microscopic testicular morphology in Greater Rhea, Rhea americana (Linnaeus, 1758)

2016 ◽  
Vol 36 (10) ◽  
pp. 1045-1052 ◽  
Author(s):  
Gustavo E. Freneau ◽  
◽  
Saulo F.M. Carvalho ◽  
Simone M.T. Saboia-Morais ◽  
Breno N. Freneau ◽  
...  
Keyword(s):  
Cross Sections ◽  
Relative Volume ◽  
Seminiferous Tubules ◽  
Rhea Americana ◽  
In Captivity ◽  
Testicular Morphology ◽  
Epithelium Thickness ◽  
Microscopy Analysis ◽  
Microscopic Morphology ◽  
Tubule Diameter

ABSTRACT: The purpose of this study was to study the microscopic morphology of the testicular parenchyma of Rhea americana birds. Fifty-four 2.5±0.5 year-old male adults bred in captivity. were used. During commercial slaughter, samples of testis were collected in November/2005, December/2006 and May/2007, in order to compare possible differences. The samples underwent optical microscopy analysis and measurements of seminiferous tubule (ST) total diameters, lumen, epithelium thickness and the relative volume of parenchyma. The ST had circular form in transverse cross sections. November/2005 and December/2006 samples had many types of germinative cells and spermatozoa in lumen, but in May/2007 the samples of epithelium were poor regarding meiotic and mitotic pictures, and it was difficult to find any spermatozoon; in many tubules the lumen was inexistent or diminished. In December/2006 and May/2007 the averages were: tubule diameter 110.3 and 5.3mμ, lumen 52.4 and 4.5mμ, epithelium thickness 57.8 and 0.7mμ respectively. The volumetric proportions were: seminiferous epithelium 75.6 and 75.9, cysts in epithelium 2.1 and 1.0, ST 93.3 and 84.0, interstitium 6.2 and 15.6 respectively. The sperm reserves were: 19.7±2 and 0±0 x109 sperm cells in December 2006 and May 2007 respectively. Microscopic measures of seminiferous tubules, spermatic cells and diameter of the nuclei were presented. These data confirm reproductive seasonality, with breeding season in spring-summer with sperm production. A great variation n parenchyma, when compared breeding was noticeable.

May captive populations of Greater Rhea (Rhea americana) act as genetic reservoirs in Argentina?

Zoo Biology ◽  
2010 ◽  
pp. n/a-n/a ◽  
Author(s):  
V. Alonso Roldán ◽  
J. L. Navarro ◽  
C. N. Gardenal ◽  
M. B. Martella
Keyword(s):  
Rhea Americana ◽  
Greater Rhea ◽  
Captive Populations

Effects of storage time on hatchability of artificially incubated Greater Rhea (Rhea americana) eggs

2004 ◽  
Vol 45 (5) ◽  
pp. 638-642 ◽  
Author(s):  
M.C. Lábaque ◽  
J.L. Navarro ◽  
M.B. Martella
Keyword(s):  
Storage Time ◽  
Rhea Americana ◽  
Greater Rhea

scholarly journals Seasonal Changes in Plasma Levels of Sex Hormones in the Greater Rhea (Rhea americana), a South American Ratite with a Complex Mating System

PLoS ONE ◽  
2014 ◽  
Vol 9 (5) ◽  
pp. e97334 ◽  
Author(s):  
Diego J. Valdez ◽  
Marilina Vera Cortez ◽  
Natalia S. Della Costa ◽  
Alvina Lèche ◽  
Cristian Hansen ◽  
...  
Keyword(s):  
Mating System ◽  
Sex Hormones ◽  
Plasma Levels ◽  
Seasonal Changes ◽  
South American ◽  
Rhea Americana ◽  
Greater Rhea

Adjacent Nesting and Egg Stealing between Males of the Greater Rhea Rhea americana

1995 ◽  
Vol 26 (4) ◽  
pp. 321 ◽  
Author(s):  
Gustavo J. Fernandez ◽  
Juan C. Reboreda
Keyword(s):  
Rhea Americana ◽  
Greater Rhea

A Survey of Enterobacteriaceae and Resistance of Greater Rhea (Rhea Americana) Eggs to Experimental Contamination by Salmonella Enteritidis

2017 ◽  
Vol 10 (1) ◽  
pp. 1-5
Author(s):  
Renato Clini Cervi ◽  
Maria Auxiliadora Andrade ◽  
Cíntia Silva Minafra-Rezende ◽  
Marcos Barcellos Café
Keyword(s):  
Salmonella Enteritidis ◽  
Pathogenic Bacteria ◽  
Bird Species ◽  
Storage Period ◽  
Salmonella Spp ◽  
Rhea Americana ◽  
Greater Rhea ◽  
Bacteria And Fungi ◽  
Protective Structures

Eggs have protective structures against possible contamination by bacteria and fungi. Pathogenic bacteria such as Salmonella spp. are therefore rarely found in adequate sanitary conditions. Few studies about the contamination of ratite eggs have been reported, and although some studies have focused on ostrich eggs, there is no information about Greater Rhea ( Rhea americana) eggs. The microorganisms that contaminate ratite eggs do not differ from those that affect other bird species. The purpose of this study was to characterise contamination in 16 eggs, supplied by a commercial breeding facility, by Enterobacteriaceae contamination and to assess the in vitro resistance to experimental contamination by Salmonella Enteritidis using analytical tests following the guidelines of the Georgia Poultry Laboratory. These elements are critical to the storage period, quality and physicochemical parameters. The results revealed the presence of the genera Proteus, Klebsiella, Citrobacter and Enterobacter related to the location of nests. Greater Rhea eggs were also found to be highly resistant to experimental infection by Salmonella Enteritidis.

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