Macroscopic and microscopic study in testes and epididymis of great rhea (Rhea americana, Linnaeus - 1758)(Rheidae) / ESTUDO DE MORFOLOGIA MACROSCÓPICA, MICROSCÓPICA TESTICULAR E EPIDIDIMÁRIA EM EMAS (Rhea americana, Linnaeus 1758)(RHEIDAE)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

The purpose of this research was studied the macroscopic morphology of rheas testis and epididymis. Were studied testis from 54 rheas, breed in captivity. In commercial slaughter, were collected testis to analyzed macroscopic measurements of testis and epididymis, consisting in length, width, thickness, circumference, volume, parenchyma and testicular capsule weight, also shape, size and blood supply. Of these parameters were calculated media and standard deviation. The testes looks like a cylinder, the testicular capsule is thin, dense and transparent, a short testicular artery arises from the A. cranialis renalis. The organs were influenced of season with reproductive and non reproductive times. In December/2006 and May/2007 the morphmetric media (x) measurements in right testes was: volume 58.70 and 14.7 mL , length 9.87 and 3.5 cm, width 2.44 and 0.6 cm, thickness 2.49 and 0.5 cm, circumference 8.02 and 2.3 cm, parenchyma weight 27.66 and 6.1 g and testicular capsule weight 1.04 and 0.3 g, respectively. In right epididymis was: volume 7.7 and 3.0 mL, length 5.8 and 1.3 cm, width 0.7 and 0.3 cm, thickness 0.6 and 0.3 cm, circumference 2.5 and 1.2 cm, parenchyma weight 6.4 and 2.8 g and capsule weight 0.4 and 0.1 g, respectively. A few of measurements, in testes and epididymis were bigger in right side than in left side (p<0.05) showing asymmetry. The medias of November/2005 were in intermediate position (p<0.05), but near the December/2006 data, probably it could be a transition phase between the rest and sexual activity (breeding season). The observations confirms sexual activity season in this specie, by spring summer. Morphologically the Rhea`s testicles and epididymis hava many points in common with other birds, but differences were observed, and has influence of seasons. The testicle and epididymis biometric characteristics were bigger in the breeding seasons. Key words: Aves, Epididymis, Morphology, Ratites, Reproduction, Seasonality, Testes

ASSUNTO(S)

ratites epidímo ratitas reprodução 1.animais silvestres; 2. aves; 3. testículo; 4 epidídimo; 4. ratitas 6. reprodução epididymis animais silvestres testículo reproduction testes wild animals great rhea ciencias biologicas

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