The use of resveratrol decreases liquid-extend boar semen fertility, even in concentrations that do not alter semen quality.

In vitro and in vivo assays were conducted to investigate the effects of trans-resveratrol (RVT) on liquid-extended boar semen during 72 h of storage at 17 °C. Thirty-six ejaculates were collected from six boars, evaluated, and extended. RVT was then added at the indicated treatment concentration (0, 0.01, 0.1 or 1 mM), and the ejaculates were cooled to 17 °C and evaluated at 0, 24, 48, and 72 h. Samples were evaluated for sperm motility, kinetics, plasma and acrosome integrity, mitochondrial membrane potential, anion superoxide levels, lipoperoxidation, and antioxidant enzyme activity. In the follow-up experiment, twenty-eight gilts were fixed-time inseminated with 0 or 0.01 mM RVT liquid-extended boar semen. After five days, they were slaughtered, and their reproductive tracts were recovered. The embryos were collected, and the pregnancy, fertility, and viable embryo rates were calculated. In the in vitro assays, total motility, plasma and acrosome membrane integrity, mitochondrial membrane potential, anion superoxide levels, and lipoperoxidation did not change at any of the evaluation times with the use of RVT up to 0.01 mM. RVT decreased SOD activity without changes in GPx. RVT used at 1 mM showed harmful effects for almost all evaluated parameters. For the in vivo assay, the same pregnancy and fertility rates were observed for both groups, while the viable embryo rate was three-fold lower in the 0.01 mM group than in the 0 mM group. The results showed a dichotomous effect of RVT; a low concentration was not harmful in vitro but was catastrophic for embryo viability.

Ocorrência de anticorpos anti-leptospira spp. em diferentes sistemas de criação de suínos / Occurrence of leptospira spp. antibodies in pigs from different housing systems

A leptospirose é uma zoonose de grande importância sócio-econômica para a suinocultura. Neste estudo, objetivou-se determinar a ocorrência de anticorpos anti-Leptospira em 132 amostras de soro sangüíneo de suínos procedentes de três diferentes sistemas de produção: granja não tecnificada, granja tecnificada e granja que utiliza o sistema intensivo de suínos criados ao ar livre (SISCAL). As amostras foram processadas através da técnica de Soroaglutinação Microscópica (SAM) em campo escuro, utilizando os seguintes sorovares: Bratislava, Canicola, Grippotyphosa, Hardjo, Icterohaemorrhagiae e Wolffi. A ocorrência de anticorpos anti-Leptospira nas três granjas foi de 47,1%, sendo que identificou-se 20%, 56% e 44,4% nas granjas não tecnificada, tecnificada e o SISCAL, respectivamente. Sessenta e duas amostras foram positivas para um ou mais sorovar, sendo mais freqüentes o Icterohaemorrhagiae, Hardjo e Wolffi com ocorrência de 67,1%, 55,7% e 24%, respectivamente.

Leptospirosis is a zoonosis and an important social-economic aspect to the pig farming. In this study, aiming at the objective to determinate the occurrence of antibodies anti-Leptospira from 132 swine serum sample preceded from three differents housing systems: intensive swine farm (high technology), intensive swine farm (low technology) and free range conditions. The samples were processed through the Microscopic Aglutination Test (MAT) in dark field, using differents serovars: Bratislava, Canicola, Grippotyphosa, Hardjo, Icterohaemorrhagiae and Wolffi. The occurrence of antibodies anti-Leptospira from three differents housing systems was 47,1%, being identified 20%, 56% e 44,4% in the intensive swine farm (high technology), intensive swine farm (low technology) and free range conditions, respectively. Sixty-two serum samples were positive for one or more serovar, being more frequent Icterohaemorrhagiae, Hardjo and Wolffi, with occurrence of 67,1%, 55,7% e 24%, respectively.