Carlos Bondan

Perfil proteico e metabolismo oxidativo de cordeiros experimentalmente infectados pelo Haemonchus contortus e suplementados com selênio e vitamina E

The objective of the present study was to describe the influence of supplementation with selenium and vitamin E on the protein and oxidative profiles of lambs experimentally infected with Haemonchus contortus. Thirty female lambs were divided into four groups as follows: G1 (n=10): infected animals; G2 (n=10): infected and supplemented; G3 (n=5): control; G4 (n=5): non-infected and supplemented. Groups 1 and 2 received 500 H. contortus larvae (L3) orally for a period of 20 days, with 2-day intervals between doses. Supplementation in groups 2 and 4 was performed on day zero by injecting 0.1mg kg-1 of sodium selenite solution (1.67%) and 2,000IU vitamin E through the intramuscular (IM) route. Vitamin E alone was injected once again on day thirty. The blood samples to determine the protein profile (total protein, albumin, alpha, beta and gamma) and oxidative metabolism (species reactive to thiobarbituric acid and glutathione peroxidase (GSPX) were performed on days zero, 20, 30, 45, 60 and 80. The OPG was quantified on days 0, 20, 45 and 80. Regarding the values of total proteins, albumin, beta and gamma globulins, the main differences were observed when the parasitized groups were compared to the supplemented, non-infected group, the latter exhibiting higher values. It is concluded that there is no influence of supplementation with vitamin E and selenium in the protein profile and oxidative metabolism when the lambs are severely parasitized with H. contortus.

Qualidade seminal e histomorfometria dos órgãos reprodutivos de ovinos tratados com fluoreto de sódio

The objective of the present study was to evaluate different reproductive parameters of ram lambs treated with sodium fluoride. Spermogram, indicators of seminal oxidative profile, seminiferous tubules diameter and cell height of the testicular epithelium, epididimus and vas deferens were analyzed. Twelve 5-month-old ram lambs were used. They were allocated into one of two experimental groups: The control, which received daily iodized salt (5g NaCl animal-1 + 0.2mg I kg-1 DM); and the treated, which received (5g NaCl animal-1 + 0.2mg I kg-1 DM + 4.7mg F kg-1 BW). After 150 days of treatment, animals went through a complete andrological exam, and were euthanized on the next day. No differences were observed in sperm motility, dead: alive ratio and morphology between the control and treated group. Also, seminal concentration of reduced glutathione and zinc, as well as, testicular weight, histology and morphometry of testicles, caudal portion of epididimus and vas deferens did not differ between groups. The seminal concentration of thiobarbituric acid reactive substances (TBARs) and seminal copper levels were lower (P<0.05) in the treated group. We conclude that chronic fluoride administration to lambs does not affect reproductive capacity as a whole. However, the data suggest that fluoride can induce a reduction in seminal lipoperoxidation and copper levels with are essential for sperm capacitation and fertilization.