COMPARAÇÃO DA CONCENTRAÇÃO DE CITOCINAS NO LÍQUIDO AMNIÓTICOS DE BEZERROS NELORE CONCEBIDOS POR MEIO DE DIFERENTES BIOTECNOLOGIAS DA REPRODUÇÃO

This study aimed to determine the levels of TNF-, IFN-, IL-6 and IL-8 in amniotic fluid of calves from IVP compared with those obtained by conventional embryo transfer and artificial insemination at the delivery. Sixty animals used were divided into groups: 1 - Twenty Nelore cross-breed cows pregnant with Nelore calves of embryos transfer conventional method (ET); 2 - Twenty Nelore cross-breed cows pregnant with Nelore calves obtained by in vitro production after follicular aspiration; 3 - Twenty pregnant Nelore cows bearing calves obtained by artificial insemination (AI). All births of the animals of the experiment were observed. During the expulsion phase the amnion was punctured and 15mL of fluid were collected using a needle and syringes compatible. The material was deposited on plastic tube and frozen in freezer for later analysis. The cytokines levels were measured by immunoenzymatic assay. The Kruskal-Wallis Test was used for statistical analysis with 5% of significance. The TNF- levels in the animals of the ET group showed no significant difference the concentration of this cytokine in the group AI and IVP. However for group AI were statistically lower than the IVP group (p 0.05). Only samples 15 and 18 of the IVP group had detectable concentrations of IL-6 and to IL-8 only 15 of the sample the same group. The results of this experiment can be adopted as standards for normal pregnancy in cattle, since there is no report of such literature. However new researches in immunology of pregnancy are necessary to describe the role of cytokines in both the maintenance of pregnancy and in the delivery labor for the bovine specie.