Produção de forragem e desempenho de novilhos em pastos de capim Mombaça sob pastejo rotativo.

O manejo do pastejo em plantas forrageiras tropicais pode promover incrementos na eficiência de produção, utilização ou colheita da forragem produzida. O objetivo nesse trabalho foi avaliar a produção de forragem e o desempenho de novilhos em Panicum maximum Jacq. cv. Mombaça sob pastejo rotativo

Beta-lactamic resistance profiles in porphyromonas, prevotella, and parvimonas species isolated from acute endodontic infections

Susceptibility to beta-lactamic agents has changed among anaerobic isolates from acute endodontic infections. The aim of the present study was to determine the prevalence of the cfxAlcfxA2 gene in Prevotella spp., Porphyromonas spp., and Parviomonas micra strains and show its phenotypic expression. Root canal samples from teeth with acute endodontic infections were collected and Porphyromonas, Prevotella, and Parvimonas micra strains were isolated and microbiologically identified with conventional culture techniques. The susceptibility of the isolates was determined by the minimum inhibitory concentration of benzylpenicillin, amoxicillin, and amoxicillin + clavulanate using the E-test method (AB BIODISK, Solna, Sweden). The presence of the cfxAlcfxA2 gene was determined through primer-specific polymerase chain reaction. The nitrocefin test was used to determine the expression of the lactamase enzyme. Prevotella disiens, Prevotella oralis, Porphyromonas gin givalis, and P micra strains were susceptible to benzylpenicillin, amoxicillin, and amoxicillin + clavulanate. The cfxA/cfxA2 gene was detected in 2 of 29 isolates (6.9%). Simultaneous detection of the cfxAlcfxA2 gene and lactamase production was observed for 1 Prevotella buccalis strain. The gene was in 1 P micra strain but was not expressed. Three strains were positive for lactamase production, but the cfxAlcfxA2 gene was not detected through polymerase chain reaction. There is a low prevalence of the cfxAl cfxA2 gene and its expression in Porphyromonas spp., Prevotella spp., and P. micra strains isolated from acute endodontic infections. Genetic and phenotypic screening must be performed simultaneously to best describe additional mechanisms involved in lactamic resistance for strict anaerobes403339344FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DO RIO GRANDE DO SUL - FAPERGSFederal University of Rio Grande do Su

Biological and economic performance of animal genetic groups under different diets.

A grazing trial to evaluate biological and economic efficiencies for rearing young animals exclusively on pasture from weaning at 7 months of age, with average initial weight of 220 ± 12 kg, to slaughter was conducted from May 2006 to October 2007. Two levels of combined supplementation during the first dry period and four genetic groups (F1 Angus-Nellore; ½Braford-¼Angus-¼Nellore; ½Brahman-¼Angus-¼Nellore; and Charolais- Nellore) were used following a 4 by 2 factorial arrangement and eight replications in a completely randomized design. During both dry periods, eight paddocks of deferred Brachiaria brizantha were utilized. During the first dry period, concentrated mix (CM) and protein-mineral mixture (PMM) were provided in quantities of 0.8% and 0.2% of body weight (BW), respectively, for 142 days. During the subsequent rainy period, the animals were transferred to eight guinea grass paddocks for 197 days. During the second dry period, the animals were allocated to the same eight palisade grass paddocks used during the previous dry season. Steers had received supplementary diet with the same CM used before at 0.8% of BW. Animals supplemented with CM gained more BW than those supplemented with PMM; however, during the rainy season, steers supplemented with PMM performed better than those receiving CM during the preceding dry period. Using concentrate since the first dry season is a risky option in economic terms, as only the Angus-Nellore group showed a positive but small gain.Título em português: Desempenho biológico e econômico de grupos genéticos animais sob diferentes dietas

Estrutura do dossel de capim-mombaça sob pastejo intermitente.

Comissão organizadora: Grácia Maria Soares Rosinha, Alexandra Rocha de Oliveir, Rodrigo Carvalho Alva

Calcium urinary excretion in dairy cows with different levels of glucose tolerance.

O objetivo deste estudo foi avaliar a excreção urinária de Ca durante o periparto em vacas leiteiras com diferentes níveis de tolerância à glicose durante o período de pré-parto

Manual para uso de animais para fins experimentais na Embrapa Gado de Corte.

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Prepartum body condition score changes and the secretion of acute phase proteins in dairy cows.

O objetivo deste estudo foi investigar o efeito da condição corporal (BCS) durante o período de pré-parto, sobre a concentração de proteínas de fase aguda e parâmetros metabólicos em vacas leiteiras