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With the objective of assessing the influence of scrotum bipartition on scrotum-testiclar thermoregulation and semen quality in sheep native to a semiarid region, 14 adult crossbred rams were placed into groups, GI (7 with bipartition in the scrotum) and GII (7 without bipartition). Images were taken of the caudal scrotum surface using a Fluke (Ti25) thermographic camera, for temperature analysis. Two semen collections were made, at an eight-day interval, by electroejaculation, to analyze macroscopic and microscopic parameters. It was observed that the surface temperatures of the proximal, medial and distal regions of the testicle and the epididymis tail did not present significant statistical difference (p > 0.05) between the groups. The GI showed a great ability to regulate the temperature in the tail region of the epididymis (p = 0.062), location of the bipartition, and the difference in temperature between the body surface and the epididymis tail was 0.54 °C much lower than the G2. Although no significant statistical difference (p > 0.05) was observed, the animals with bipartition presented higher means for body surface temperature, showing greater efficiency in heat dissipation and indicating that these animals used peripheral vasodilation on a larger scale to eliminate excess heat and thus had a lower energy expenditure. The semen parameters studied in both groups were within the desirable values for the species, with no differences between the groups (p > 0.05). Higher scrotum testiclar values were observed (scrotum circumference GI = 30.40 cm ± 0.53 and GII = 28.42 ± 1.13 cm, testicle length, right and left, respectively GI = 8.14 ± 0.90 cm, 8.00 ± 0.00 cm and GII = 7.28 ± 0.04 cm, 7.28 ± 0.48 cm) and bodyweight (GI = 44.57 ± 5.25 Kg and GII = 39.85 ± 1.57 Kg) in rams with scrotum bipartition (p > 0.05). It is concluded that scrotum bipartite in rams was shown to be an evolutionary indicator showing that animals with this characteristic dissipate heat more efficiently, have bigger scrotum-testicle biometrical parameters and heavier body weight. However, as the rams with scrotum bipartite presented division of less than 50% of the scrotum length, this degree did not influence the scrotum surface temperature and semen quality, as has been observed in goats with the same characteristic.
With the objective of assessing the influence of scrotum bipartition on scrotum-testiclar thermoregulation and semen quality in sheep native to a semiarid region, 14 adult crossbred rams were placed into groups, GI (7 with bipartition in the scrotum) and GII (7 without bipartition). Images were taken of the caudal scrotum surface using a Fluke (Ti25) thermographic camera, for temperature analysis. Two semen collections were made, at an eight-day interval, by electroejaculation, to analyze macroscopic and microscopic parameters. It was observed that the surface temperatures of the proximal, medial and distal regions of the testicle and the epididymis tail did not present significant statistical difference (p > 0.05) between the groups. The GI showed a great ability to regulate the temperature in the tail region of the epididymis (p = 0.062), location of the bipartition, and the difference in temperature between the body surface and the epididymis tail was 0.54 °C much lower than the G2. Although no significant statistical difference (p > 0.05) was observed, the animals with bipartition presented higher means for body surface temperature, showing greater efficiency in heat dissipation and indicating that these animals used peripheral vasodilation on a larger scale to eliminate excess heat and thus had a lower energy expenditure. The semen parameters studied in both groups were within the desirable values for the species, with no differences between the groups (p > 0.05). Higher scrotum testiclar values were observed (scrotum circumference GI = 30.40 cm ± 0.53 and GII = 28.42 ± 1.13 cm, testicle length, right and left, respectively GI = 8.14 ± 0.90 cm, 8.00 ± 0.00 cm and GII = 7.28 ± 0.04 cm, 7.28 ± 0.48 cm) and bodyweight (GI = 44.57 ± 5.25 Kg and GII = 39.85 ± 1.57 Kg) in rams with scrotum bipartition (p > 0.05). It is concluded that scrotum bipartite in rams was shown to be an evolutionary indicator showing that animals with this characteristic dissipate heat more efficiently, have bigger scrotum-testicle biometrical parameters and heavier body weight. However, as the rams with scrotum bipartite presented division of less than 50% of the scrotum length, this degree did not influence the scrotum surface temperature and semen quality, as has been observed in goats with the same characteristic.
Estudamos em 40 caprinos adultos da raça Bhuj Brasileira os aspectos histológicos do funículo espermático. Observamos que este se acha envolvido por uma cápsula de tecido conjuntivo fibroelástico denso, de espessura variável, pregueada em alguns pontos, e revestida por mesotélio que circunda todo o conjunto vásculo-nervoso, e projeta-se para formar o mesoducto deferente. Em posição subcapsular, verifica-se uma camada de tecido conjuntivo fibroelástico frouxo, de espessura variável, que circunda parcialmente o funículo espermático, isolando nas regiões deferencial e abdeferencial, conjuntos vásculo-nervosos, responsáveis pela nutrição do epidídimo. Na região do mesoducto deferente, o tecido subcapsular acompanhado de tecido adiposo constitui a camada interna deste meso, formando a sua adventícia e abrigando vasos e nervos deferenciais. Na região abdeferencial, pequenos acúmulos de tecido adiposo são vistos de permeio aos vasos e nervos desta região. Entre as artérias, veias e nervos testiculares, bem como entre os vasos das regiões deferencial e abdeferencial, observa-se o tecido conjuntivo denso, intervascular, rico em fibras elásticas, que constitui as adventícias contínuas destes vasos. O arranjo vascular mostra que o segmento da artéria testicular, contido no funículo espermático, apresenta trajeto sinuoso. Estando envolvido pelo plexo venoso pampiniforme, formado por veias testiculares desprovidas de válvulas de calibres variados, apresentando amplas comunicações entre si. As veias responsáveis pela drenagem do epidídimo e ducto deferente estão localizadas em posição subcapsular deferencial e abdeferencial e mostram-se providas de válvulas. O trato das artérias testiculares no funículo espermático apresenta como média e desvio padrão 134,6±38,1cm à direita, e 137,0±33,9cm à esquerda, não existindo diferenças estatisticamente significantes ao nível de 5%, quando comparamos a média do segmento da artéria testicular contida no funículo espermático direito em relação ao esquerdo.
RESUMO.-[Biometria escroto-testicular em caprinos: inϐluência de período do ano na bipartição escrotal.]Objetivou-se neste trabalho avaliar a biometria escroto-testicular em caprinos com escroto simples e bipartido, criados no Estado do Piauí, Brasil, nos períodos seco e chuvoso do ano. The scrotal-testicular biometry was evaluated in goats raised in Piaui state, Brazil, presenting different levels of scrotal division, in rainy and dry periods of the year. For this study, eighteen male goats at mating age were accomplished and arranged into three groups (6 animals each), obeying the classiϐication as goats with no scrotal bipartition (GI), goats showing scrotal bipartition up to 50% of testicular length (GII), and goats with more than 50% of scrotal bipartition (GIII). The biometry of the scrotal-testicular was made evaluating the scrotal length (SL), scrotal circumference (SC), testicular length (TL) and testicular volume (TV). The results were evaluated following the variance analysis (ANOVA) and the SNK test applied on the average comparisons. The analysis of the data demonstrated high values, in dry and rainy periods, of SC (24.63cm/ 26.97cm), SL (16.61cm/ 18.24cm), TL (5.32cm/ 5.93cm), TV (173.81cm 3 / 203.01cm 3 ). This supports the hypothesis of the inϐluence of the period of the year and of the scrotal bipartition on the scrotal-testicular biometry in goat.INDEX TERMS: Goats, scrotal bipartition, biometry, year-periods variability.to testicular) e o grupo III (bipartição escrotal superior a 50% do comprimento testicular). A biometria escroto-testicular consistiu do comprimento escrotal (COE), circunferência escrotal (CE), comprimento testicular (CT) e volume testicular (V). Os resultados foram submetidos à análise de variância (ANOVA), seguido do teste SNK para comparação das médias. Os dados mostraram que os animais do grupo GIII apresentaram, no período seco, os valores de CE, COE, CT e V de 24,63cm, 16,61cm, 5,32cm, e 173,81cm³, respectivamente e de 26,97cm para CE, 18,24cm para COE, 5,93cm para CT e 203,01cm³ para V, no período chuvoso. Todos esses valores foram superiores (p<0,05) aos encontrados para os animais dos demais grupos. Conclui-se que o grau de bipartição escrotal e o período do ano interferem na biometria escroto-testicular de caprinos. TERMOS DE INDEXAÇÃO: Caprinos, escroto bipartido, biometria.
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