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| Author(s): |
Simone Maria Massami Kitamura Martins
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Medicina Veterinária e Zootecnia (FMVZ/SBD) |
| Defense date: | 2011-06-03 |
| Examining board members: |
Rubens Paes de Arruda;
Eneiva Carla Carvalho Celeghini;
Anibal de Sant Anna Moretti;
Frederico Ozanam Papa;
Felipe Perecin
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| Advisor: | Rubens Paes de Arruda |
| Abstract | |
The selenium plays a remarkable role on semen quality by acting in the development of middle piece, in the development of Sertoli cells and also as a component of selenoproteins, primarily of glutathione peroxidase. The selenium is usually utilized on animal diets as sodium selenite (inorganic). Organic sources have revealed a differentiated bioavailability, becoming important allies to enhance its use by the animals and reducing environmental impact. Therefore, this experiment evaluated the effects of organic selenium on seminal characteristics on raw and stored semen at 18ºC for three days. Twelve boars were divided into three experimental groups: CONTROL inorganic sourced diet (0.30 ppm sodium selenite, n=4), INORGANIC inorganic sourced diet (0.50 ppm sodium selenite, n=4) and ORGANIC organic sourced diet (0.50 ppm selenium- Sel-PlexTM, Alltech, Inc., n=4). Semen analysis consisted of computerized assessment of motility (CASA) and flow cytometric analysis of plasmatic and acrosomal membranes integrity, mitochondrial membrane potential, lipidic peroxidation and phospholipid hidroperoxide glutatione peroxidase activity. Moreover, the blood and seminal plasma concentrations of selenium were evaluated. Data was submitted analysis of variance (SAS, 1999). Hypothesis tested were considered significant when p<0.05. In natura semen analysis showed that spermatic concentration, total cell number, number of doses and percentage of normal cells were positively influenced by organic treatment. Percentages of head and middle piece defects and proximal cytoplasmic droplets were decreased on animals supplemented with yeast selenium; however percentages of tail defects were increased in these animals. Neck defects were reduced by selenium supplementation. Acrosomal and plasmatic membrane integrity, mitochondrial membrane potential and spermatic membrane peroxidation, as well as motility characteristics were not enhanced with the use of yeast selenium. Selenium concentration on blood and seminal plasma were higher on organic group, similarly to PHGPx activity. Stored semen analysis showed that acrosomal and plasmatic membranes integrity, mitochondrial membrane potential and membrane peroxidation were not influenced by organic selenium supplementation. Nonetheless, motility characteristics were maintained normal with significant differences on behalf of organic treatment, likewise the percentage of normal cells, head defects and proximal droplets. The organic group presented higher percentage of tail defects when compared to the others and supplementation with selenium, independently from the source, reduced the percentages of middle piece defects. PHGPx activity was also positively influenced by organic treatment. Based on results, positives effects of dietary organic selenium supplementation (0.5 ppm) were observed on some spermatic characteristics of raw and stored boar semen. (AU) | |