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espanolRESUMEN El objetivo de este estudio fue evaluar la ecotextura testicular de los toros Nelore y correlacionarlo con los parametros de espermatogenesis. Para este proposito, 41 toros de edades de 3-5 anos y con pesos corporales en el intervalo de 510,2 ± 21,61 kg fueron seleccionados para el estudio. Los toros se sometieron a ecografia, utilizando un dispositivo portatil junto con un transductor lineal a una frecuencia de 7,5 MHz. Inmediatamente despues, los animales fueron castrados, y el tejido testicular se trato con Karnovsky fijador. Los fragmentos testiculares se incluyeron en metacrilato de glicol y se tineron con una solucion de borato de sodio-azul de toluidina al 1%. La intensidad media de pixeles en el parenquima testicular se determino para secciones de superficie de 1.600 mm2. Los El area entre los dos testiculos derecho e izquierdo dieron lugar a la intensidad media de los pixeles de 105,22 ± 13,58, 107,95 ± 12,82 y 106,59 ± 11,43, respectivamente. El coeficiente de eficiencia de la mitosis espermatogonial fue 19,74; Indice meiotico fue 2,63, y el rendimiento global del espermatogenesis alcanzo el 52,0. No se observo correlacion (P>0,05) entre ecotextura testicular y cualquiera de los parametros morfometricos medidos. Estos resultados sugieren que ecotextura testicular no es un metodo viable para el analisis indirecto de la poblacion celular en el epitelio seminifero, el rendimiento de la espermatogenesis intrinseco, o el indice de celulas de Sertoli en toros Nelore. EnglishABSTRACT The objective of this study was to evaluate the testicular echotexture of Nelore bulls and to correlate it with spermatogenic parameters. Forty one bulls aged 3-5 years, with body weight of 510.2 ± 21.61 kg were selected for the study. The animals were subjected to ultrasonography, using a portable device coupled with a linear transducer at a frequency of 7.5 MHz. Immediately afterwards they were castrated and the testicular tissue was treated with Karnovsky fixative. Next, the fragments were embedded in glycol methacrylate and stained with toluidine blue-1% sodium borate solution. The average pixel intensity in the testicular parenchyma was determined for 1,600-mm2 surface sections. The right and left testicles and the area between the two testicles resulted in average pixel intensities of 105.22 ± 13.58, 107.95 ± 12.82, and 106.59 ± 11.43, respectively. The efficiency coefficient of spermatogonial mitosis was 19.74; meiotic index was 2.63, and overall yield of spermatogenesis was 52.0. No correlation (P>0.05) was observed between testicular echotexture and any of the measured morphometric parameters. These results suggest that testicular echotexture was not a viable method for the indirect analysis of cellular population in the seminiferous epithelium, intrinsic spermatogenic performance, or the Sertoli cell index in Nelore bulls.

Testicular echotexture is not a viable method to indirectly evaluate the spermatogenic parameters in Nelore bulls