Produção de carne bovina utilizando confinamento.

Confinamento; Ganho de peso e eficiência de conversão alimentar; Característica de carcaça

Interpretação dos resultados de análises bromatológicas de silagens e outros ingredientes para ração.

O planejamento da alimentação de bovino com forragens conservadas, tais como silagens, envolve informações sobre a disponibilidade deste volumoso e sua qualidade. O controle da qualidade, por meio de análises químico-bromatológicas do produto em laboratório especializado, e essencial, devido as dificuldades para monitorar a fermentação no silo, a semelhança de uma indústria, que esteriliza ou pasteuriza a matéria-prima antes de adicionar os inoculantes, e controlar a temperatura para obter um produto padronizado. O uso de resíduos de cultura, incluindo-se os resíduos de pré-limpeza, e de indústria, como volumosos para alimentação de bovinos também requer análise criteriosa de qualidade, em razão da enorme variabilidade encontrada (produto não-padronizado) nestes produtos.Resumo expandido

Study of the spatial variation of the biodegradation rate of the herbicide bentazone with soil depth using contrasting incubation methods

Vertical and horizontal spatial variability in the biodegradation of the herbicide bentazone was compared in sandy-loam soil from an agricultural field using sieved soil and intact soil cores. An initial experiment compared degradation at five depths between 0 and 80 cm using sieved soil. Degradation was shown to follow the first-order kinetics, and time to 50% degradation (DT50), declined progressively with soil depth from 56 d at 0–10 cm to 520 d at 70–80 cm. DT50 was significantly correlated with organic matter, pH and dehydrogenase activity. In a subsequent experiment, degradation rate was compared after 127 d in sieved soil and intact cores from 0 to 10 and 50 to 60 cm depth from 10 locations across a 160 × 90 m portion of the field. Method of incubation significantly affected mean dissipation rate, although there were relatively small differences in the amount of pesticide remaining in intact cores and sieved soil, accounting for between 4.6% and 10.6% of that added. Spatial variability in degradation rate was higher in soil from 0 to 10 cm depth relative to that from 50 and 60 cm depth in both sieved soil and intact core assessments. Patterns of spatial variability measured using cores and sieved soil were similar at 50–60 cm, but not at 0–10 cm depth. This could reflect loss of environmental context following processing of sieved soil. In particular, moisture content, which was controlled in sieved soil, was found to be variable in cores, and was significantly correlated with degradation rate in intact topsoil cores from 0 to 10 cm depth

Free Fields for Chiral 2D Dilaton Gravity

We give an explicit canonical transformation which transforms a generic chiral 2D dilaton gravity model into a free field theory.Comment: LaTeX file, 4 pages, to appear in Phys. Rev.

Testing models with non-minimal Higgs sector through the decay t->q+WZ

We study the contribution of charged Higgs boson to the rare decay of the top quark t->q+WZ (q=d,s,b) in models with Higgs sector that includes doublets and triplets. Higgs doublets are needed to couple charged Higgs with quarks, whereas the Higgs triplets are required to generate the non-standard vertex HWZ at tree-level. It is found that within a model that respect the custodial SU(2) symmetry and avoids flavour changing neutral currents by imposing discrete symmetries, the decay mode t->b+WZ, can reach a branching ratio of order 0.0178, whereas the decay modes t->(d,s)+WZ, can reach a similar branching ratio in models where flavour changing neutral currents are suppressed by flavour symmetries.Comment: Typeset using REVTEX and EPSF, 5 pag, 2 figure

Correlação entre produção e componentes do leite em gado de corte.

Este experimento teve como objetivo avaliar a produção e a composição do leite de vacas das raças Canchim e Nelore, tendo em vista o manejo da fase de cria de bovinos de corte

Relação do peso a desmama de bezerros da Raça Canchim e cruzados canchim x Nelore com constituintes do leite.

O trabalho teve como objetivo avaliar a importância das produções totais de proteÍnas, gordura e extrato seco total no leite, em 34 semanas de bezerros da raca Canchim e cruzados 1/2 Canchim + 1/2 Nelore.Resumo