Respuesta al consumo adicional de zinc orgánico en la calidad seminal de ovinos de pelo

Miguel Rodríguez-Gaxiola, Juan Romo-Valdez, Briceida Ortiz-López, Rubén Barajas-Cruz, Soila Gaxiola-Camacho, Javier Romo-Rubio

Resumen

Con el objetivo de evaluar la respuesta al consumo adicional de diferentes niveles de zinc orgánico en la calidad seminal de ovinos de pelo, se utilizaron 9 borregos prepúberes (entre los 3 ½ a 4 ½ meses de edad) con un peso promedio de 13 kg, los cuales fueron asignados a uno de tres tratamientos en un diseño experimental completamente al azar. Los tratamientos consistieron: 1) Testigo (T; n = 3), los borregos recibieron una dieta a base de maíz-soya-forraje, sin adición de zinc (Zn); 2) ZnMet35, dieta testigo más la adición de 35 ppm de Zn a partir de metionina de Zn (ZnMet) y 3) ZnMet70, dieta testigo más la adición de 70 ppm de Zn. La investigación se llevó a cabo entre los meses de julio de 2009 a abril de 2010. El consumo de dietas adicionadas con 70 ppm de Zn elevó (P < 0.05) el volumen del eyaculado (0.9696 vs. 0.7773 y 0.6864 mL) y la cantidad total de espermatozoides por eyaculado (1955.9 vs. 1463 y 1301.1 millones), mejoró (P < 0.05) el porcentaje de espermatozoides con morfología normal (92.870 vs. 89.045 y 86.818%) y elevó (P = 0.09) la concentración plasmática de testosterona (403.87 vs. 332.12 y 264.59 ng/dL) respecto de los borregos que consumieron dietas adicionadas con 35 ppm de Zn orgánico y los del grupo testigo, respectivamente. Se concluye que el consumo adicional de 70 ppm de Zn a partir de ZnMet  eleva el volumen, la cantidad y calidad de espermatozoides del eyaculado, así como la concentración plasmática de testosterona en ovinos de pelo criados en condiciones subtropicales.

With the objective to evaluate the response of additional intake of different levels of organic zinc on the seminal quality of hair lamb, nine prepubertal lambs were used (between 3.5 to 4.5 months of age) with an average weight of 13 kg and assigned to one of three treatments in an experimental design completely randomized. The treatments consisted on 1) Control (C; n = 3); the lambs received a diet from corn-soybean meal-forage, without addition of organic zinc (Zn); 2) ZnMet35, control diet plus addition of 35 ppm zinc from Zn methionine (ZnMet); and 3) ZnMet70, control diet plus addition of 70 ppm Zn. The investigation was carried out between July 2009 and April 2010. The consumption of the diet supplemented with 70 ppm organic Zn raised the seminal volume (P<0.05), (0.9696 vs. 0.7773 y 0.6864 mL), and the total of spermatozoa per ejaculation (1955.9 vs. 1463 and 1301.1 millions), improved (P<0.05) the percentage of spermatozoa with normal morphology (92.870 vs. 89.045 and 86.818 %), as well as the plasmatic concentration of testosterone (403.87 vs. 332.12 and 264.59 ng/dL; p = 0.09) respect to the treatments that received a diet supplemented with 35 ppm of organic Zn, and the control group, respectively. It is concluded, that consumption of diet supplemented with 70 ppm of Zn from ZnMet, raises the ejaculated volume, quantity, quality of spermatozoa, and raises the plasmatic concentration of testosterone, in hair lambs breeding in the subtropical zone.

Palabras clave

zinc, calidad seminal, borregos

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