Efeito de dieta suplementada com Ãleo de girassol sobre o perfil lipÃdico plasmÃtico e seminal de caprinos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

In the semi-arid region of northeast Brazil, the production of caprine is a major economical activity, especially due to the resistance and adaptation ability shown by these animals under semi-arid climate conditions. This work aims to investigate the effect of sunflower oil supplementation on plasma and semen lipid profiles, in order to evaluate whether it is important for the fertility of these small ruminants. Twenty-seven adult Anglo- Nubian male caprines, 2 to 4 years old and mean weight 54,04 Â 8,67 Kg, were selected and kept in individual stalls, under environment temperature. These animals were split in 3 groups, according to the percentage of lipid content administered (2 %, 4 % and 6 % sunflower oil). Semen and circulating lipids were determined before and after 30 and 60 days on diet-supplement. Hypoosmotic test for spermatozoa and sperm cell count were also performed. Total cholesterol plasma levels were elevated in all animals after the lipid supplementation, but the seminal levels of cholesterol did not show modification in the goats fed 4 % sunflower oil. In average, triglycerides levels were unaltered, but total phospholipids increased. There was a decrease in lysophosphatidylcholine and a significant rise in phosphatidylcholine in the goats receiving 2 % of sunflower oil in the diet, but sphingomyelin and glycosphingolipids increased only in those animals supplemented with 4 %. The hypoosmotic test showed a significant increase in the percentage of spermatozoa reactive to the medium, in all groups. The results suggest a positive influence of sunflower oil on the sperm cell membrane fluidity, what can be explained by the increase on the main phospholipids that are components of cell membrane. These lipid changes seem to have a significant role in the spermatogenesis, since the sperm cell concentration in the ejaculate was also significantly increased. Thus, the results of present work suggest that the supplementation of the diet with 2 % sunflower oil is enough to improve the reproductive performance of male caprine

ASSUNTO(S)

Ãleo de girassol bioquimica caprino dieta suplementada

ACESSO AO ARTIGO

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