Biometric testicular and serum testosterone concentration of Brazilian Ponies stallions

Abstract

SUMMARYEvaluation of the testis size is very important in stallions' selection, since it is an indirect determinant of their reproductive potential. The aim of this study was to evaluate the biometric testicular traits, calculate the volume testicular and analyze the serum testosterone concentration of the stallion. During six months were measured the tests of adults Brazilian Ponies stallions from northern of Rio de Janeiro State, Brazil. The length, the width and the height of the testicles (TL, TW and TH) were measured. From these measurements, the total testicular volume (TTV) was calculated. The serum testosterone concentration was also evaluated. The data were studied by analysis of variance and were calculated the correlations among the traits. The average of the testis biometry were TL 5.8 ± 0.6 cm; TW 3.8 ± 0.5 cm; TH 4.7 ± 0.4 cm and 111.2 ± 27.7 for TTV. Mean of serum testosterone concentration was 0.89 ± 0.52 ng/dl. High correlations between biometry testicular traits with testicular volume were observed and low to moderate correlations were observed for testicular traits, testosterone and sperm output. The testis size could be an important trait that assists to the prediction of stallion's reproductive potential of the Brazilian ponies stallions. It is suggested that there would be no fluctuation in serum testosterone concentration in Brazilian ponies stallions that coult afect on its fertility.Keywords: andrology, horse, reproduction RESUMOAvaliação do tamanho dos testículos é muito importante na seleção de garanhões, uma vez que é um determinante indireto do seu potencial reprodutivo. O objetivo deste estudo foi avaliar as características de biometria testiculares, calcular o volume testicular e analisar a concentração sérica de testosterona de garanhões. Durante seis meses, foram medidos os testículos de garanhões Pôneis da raça Brasileiro adultos, criados no Norte do Estado do Rio de Janeiro, Brasil. O comprimento a largura e a altura dos testículo (TL, TW e TH) foram mensurados. A partir dessas medidas, calculou-se o volume testicular total (TTV). Os dados foram avaliados por análise de variância e foram calculadas as correlações entre as características. A média geral das características de biometria testicular e volume testicular foram: TL 5,8 ± 0,6 cm; TW 3,8 ± 0,5 cm; TH 4,7 ± 0,4 cm e TTV 111.2 ± 27,7. A média de concentração sérica de testosterona foi de 0,89 ± 0,52 ng/dl. Altas correlações foram observadas entre as características de biometria testicular e volume testicular. Baixas a médias correlações entre as características testiculares com produção espermática e com concentração de testosterona foram observadas. O tamanho testicular pode ser uma importante característica que auxilia na predição do potencial reprodutivo do garanhão pôneis da raça Brasileira. Sugere-se que não há variações na concentração sérica de testosterona nos pôneis da raça Brasileira que poderia afetar em sua fertilidade. Palavras-chave: andrologia, equino, reproduçãoRev.

Measurement of the reproductive efficiency of Arabian stallions intended for AI in Algeria

“…All correlation coefficients were highly significant (p<0.01). These results are in agreement with those reported by Tibary et al (2005), Samper et al (2007), Hafez and Hafez (2004), Rua et al (2017).…”

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Pantaneiro stallions: did the environment influence seminal traits and testicular biometry?

“…In addition, we could highlight the fact LTH and RTH were considering lower in this study. the values of width and height of Pantaneiro stallions are more similar to observed in Brazilian ponies by(Rua et al, 2017).…”

Correlation Between Testicular Biometrics and Serum Level of Reproductive Hormones of Crossed Arewa Breed of Stallions in Ilorin, Nigeria

“…However, the correlation between testicular size and reproductive hormone most especially testosterone could be affected by some factors. This response may be a consequence of multiple alterations in the Leydig cell's function and seasonal variation which were not assessed in this study (Ansari et al, 2007;Rua et al, 2017). Thus, this explains the non significant correlation observed in this study.…”

“…This is because it is an indirect determining factor of their reproductive potential. Matured stallions' testes are averagely capable of producing approximately 18-20 million sperms per gram of testicular tissue per day (McCue, 2014;Rua et al, 2017). Testicular biometrics is indicative of testicular parenchymal tissue which determines sperm output through spermatogenesis.…”