Abstract
We studied the morphology of the spermatic funicle in goats according to their scrotum conformation. Animals were divided into three experimental groups: I – non-bipartite scrotum; II - bipartite scrotum up to 50% of testicular length; and III – bipartite scrotum over 50% of testicular length. We evaluated the length of the spermatic funicle, cremaster muscle, the segment of the umbilical artery and spermatic funicle histology. In all groups the testicular artery was found to be single (95%) or divided (5%), surrounded by numerous veins without valves and varied and irregular diameters. In group I, the subcapsular adipose tissue was involving the veins. In groups II and III, this tissue was showed as plates surrounding the funicle, becoming thicker near the mesoductus, suggesting the presence of thermal insulation between the vessels and the vas deferens. We found that goats from group III showed greater length of funiculus (mean=10.25cm) and testicular artery (mean=152.80 cm), in comparison with groups I (8.06 and 103.25 cm) and II (8.60 and 121.80 cm). This may facilitate heat exchange between arterial and venous blood. The length of the cremaster muscle did not differ statistically (P>0.05) between groups I (19.37 cm), II (18.61) and III (20.06 cm). KEYWORDS: cremaster muscle; testicular artery; testicular vein; thermoregulation.
Highlights
A reprodução animal pode ser entendida como a interação entre o genótipo do animal e a influência dos fatores ambientais (SANTOS et al, 1998)
Acredita-se que a presença desse tecido não tenha muita influência na perda de calor da artéria para a veia testicular, pois, segundo MACHADO JÚNIOR et al (2009), existe diferença entre a temperatura escroto-testicular de caprinos com e sem bipartição escrotal, mesmo que ambos os grupos possuam tecido conjuntivo envolvendo o funículo
Nos caprinos com escroto não bipartido, os vasos, em região subcapsular, encontram-se rodeados por tecido adiposo, o que poderia dificultar as trocas de calor entre os vasos desses animais
Summary
ALINE SOARES NUNES1, AÍRTON MENDES CONDE JÚNIOR2, MAÍRA SOARES FERRAZ3, ANTÔNIO AUGUSTO NASCIMENTO MACHADO JÚNIOR3, DEISE CRISTINE SCHRODER4, MARIA ACELINA MARTINS. Estudou-se a morfologia do funículo espermático em caprinos com escroto bipartido e não bipartido. Foram formados três grupos de caprinos: I - escroto não bipartido; II - escroto bipartido até 50% do comprimento testicular; e III - escroto bipartido acima de 50% do comprimento testicular. O comprimento do funículo espermático, o músculo cremáster, o segmento da artéria testicular do funículo e histologia do funículo espermático foram avaliados. No grupo I, o tecido adiposo subcapsular envolvia as veias, fato não observado nos demais grupos. Os caprinos do grupo III apresentaram maior comprimento do funículo (média=10,25cm) e da artéria testicular (média=152,80cm), em comparação com os grupos I (8,06 e 103,25 cm) e II (8,60 e 121,80 cm). O comprimento do músculo cremáster não diferiu estatisticamente (P>0,05) entre os grupos I (19,37cm), II (18,61cm) e III (20,06cm).
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