Abstract

RODRIGUEZ-GAXIOLA, Miguel et al. Response to the additional intake of different levels of organic zinc on the seminal quality of hair lambs. Abanico vet [online]. 2016, vol.6, n.3, pp.24-34. ISSN 2448-6132.  https://doi.org/10.21929/abavet2016.63.2.

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.

Keywords : zinc; seminal quality; lamb.

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