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Belo Horizonte, Brazil

Silva G.C.,Federal University of Goais | Nascimento M.R.B.M.,Federal University of Uberlandia | Penha-Silva N.,Federal University of Uberlandia | Fernandes E.A.,Federal University of Uberlandia | And 2 more authors.
Revista Ceres | Year: 2015

Broilers raised under heat stress can have reduced antioxidant standard, however supplementation with zinc and selenium can mitigate this effect.In this study, we evaluated the effects of zinc and selenium supplementation, in the organic and inorganic forms, on performance, lipid peroxidation and carcass yield of broilers subjected to cyclic heat stress (HS). A total of 2400 one-day-old male chicks were raised in thermal comfort until the 14th day, then 1200 chicks were subjected to HS. The experiment was arranged in a completely randomized design in a 2 x 5 factorial with 2 environmental conditions [comfort (C) and HS] and 5 supplementation levels [S1) control diet; S2) S1 + 40 mg / kg of inorganic Zn; S3) S1 + 40 mg/kg of organic Zn; S4) S1 + 40 mg / kg of inorganic Zn and 0.2 mg / kg organic selenium and S5) S1 + 40 mg / kg of organic Zn and 0.2 mg / kg selenium organic], totalling 10 treatments with 8 replicates of 30 birds each. The variables evaluated were blood levels of thiobarbituric acid reactive substances (TBARS), cloacal temperature (CT), weight gain, feed intake, feed conversion, live weight and carcass yield and cuts. On the 35th and 42nd days, HS broilers showed increased cloacal temperature. Weight gain, feed conversion and eviscerated carcass were negatively influenced by heat. Environment and supplement levels did not affect breast meat yield with and without bone, drumstick, thigh, and wing. In the environmental and nutritional conditions of this study, there was no need for supplemental addition of organic and inorganic zinc and organic selenium. Source

This work was carried out based on the hypothesis that polymers associated with silicone (Si) would be obstructing tracheid, therefore contributing to a nutritional collapse of Pinus caribaea forest bulks, in the Triângulo Mineiro and Alto Paranaíba (MG) plains. Previous studies showed a narrow relationship between these physiologic patterns with nutritional deficiencies. However, it is known that seeds used in the establishment of these bulks presented great genetic variability well expressed in diversity of plant behavior, inasmuch as part of them remains healthy and the others start a changeable intensity senescence, which ends up in the death of the plant. In this study, it was sampled segments of root and apical shoots of apparently normal (green needles) plants at different senescence stages (yellow needles) and dead plants. Those samples, after being dried until critical point, were observed by scanning electron microscope coupled to an X-ray microprobe. It was noted the presence of Si and Al in xylem and phloem tissues in the aerial section as well as in the roots, and the greatest contents were found in xylem of the plants. However, it was not observed any obstruction or any presence of Si-Al bodies in the conducting tissues of the analyzed parts. But, it was observed that the presence of Si associated to Al occurred according to a 2.6 order Al/Si ratio. Data also revealed that Si variation amplitude is 1.5 times greater than the Al variation amplitude. It concluded that Si variation amplitude is greater than the one of Al, which establishes a variation relationship (Si-Al). Source

Da Silva J.B.,Sao Paulo State University | Rangel C.P.,Instituto Mineiro Of Agropecuaria | De Azevedo Baeta B.,Federal Rural University of Rio de Janeiro | Da Fonseca A.H.,Federal Rural University of Rio de Janeiro
Ticks and Tick-borne Diseases | Year: 2013

The purpose of this study was to identify the influence of physiological state, season, breed, number of lactations, dairy productivity, and stocking rate on infestation by Rhipicephalus microplus in dairy cows. Two hundred cows were selected through proportional representative sampling at the Seropédica Experimental Station (Pesagro-Rio), Brazil. Fully or partially engorged R. microplus females measuring between 4.5 and 8.0. mm were counted on the right side of each animal. The tick infestation prevalence data were analyzed in relation to the risk factors, using multiple logistic regression. Associations between prevalence and its possible influencing determinants were measured using odds ratios. The average tick count of cows during the peripartum and lactation periods was significantly higher (p<0.05; OR=4.82) than the count in dry cows. Taurine animals showed significantly higher infestation (p<0.05; OR=3.28) than pure zebuine animals. Among cross-bred animals, the infestation was higher (p<0.05) in F1 animals (1/2 taurine × 1/2 zebuine) than in Girolando animals (5/8 zebuine × 3/8 taurine). Primiparous cows (p<0.05) had significantly heavier infestations than multiparous cows. Dairy production showed a positive correlation with tick infestation (p<0.03; OR=2.94), such that the most productive animals were the most parasitized ones. Animals kept at high densities were significantly more heavily infested (p<0.05, OR=6.32) than animals kept at low density. First-lactation and high-productivity taurine animals were more vulnerable to R. microplus, thus comprising a high-risk group in dairy herds. © 2012 Elsevier GmbH. Source

Iasbik A.F.,Instituto Mineiro Of Agropecuaria | Pinto P.S.A.,Federal University of Vicosa | Bevilacqua P.D.,Federal University of Vicosa | Nero L.A.,Federal University of Vicosa | And 2 more authors.
Ciencia Rural | Year: 2010

Taeniasis occurs due to the presence of the adult form of Taenia sp. in human beings, and cysticercosis is caused by the presence of the larval stage of T. solium in pigs and humans. A transversal study was conducted aiming to determine the prevalence of porcine cysticercosis and taeniasis in 176 farms located in rural areas of Viçosa-MG. Blood samples of 226 pigs, and feces samples of 266 humans were collected. An epidemiological survey has also been done. We found a prevalence of 0.4% of porcine cysticercosis and taeniasis has not been found. The epidemiological data has shown that although most people consumed non-inspected pork, it used to be prepared well-done. Data showed that 88.1% of the pigs are reared in confinement in only 1.1% of the properties the sewer was disposed on the soil, and 99.4% used pipes for water distribution. It can be concluded that the prevalence of the taeniasis-cysticercosis complex in rural areas of Viçosa (State of Minas Gerais) is lower than in other similar regions. Source

Braga A.R.C.,Instituto Mineiro Of Agropecuaria | Correa A.P.F.L.,Sao Paulo State University | Camossi L.G.,Sao Paulo State University | Da Silva R.C.,Sao Paulo State University | And 2 more authors.
Revista da Sociedade Brasileira de Medicina Tropical | Year: 2014

Introduction: Leishmaniasis and toxoplasmosis are important to public health. Methods: Antibodies for Toxoplasma gondii and Leishmania spp. were evaluated in cats from Campo Grande, State of Mato Grosso do Sul, Brazil, a region endemic for canine visceral leishmaniasis. Serum samples from 50 asymptomatic cats were titrated for T. gondii by the immunofluorescence antibody test and modified agglutination test and for Leishmania spp. by the immunofl uorescence antibody test. Results: These two agents coinfected two (4%) of the 50 tested animals. Conclusions: These findings demonstrate the concomitant presence of two important zoonoses in cats from Brazilian endemic regions for canine visceral leishmaniasis. © 2014, Sociedade Brasileira de Medicina Tropical. All Rights Reserved. Source

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