Características da carcaça e dos componentes não carcaça de cordeiros oriundos de parto simples ou duplo.

Resumo: Um experimento foi conduzido com o objetivo de avaliar as características da carcaça e dos componentes não carcaça de cordeiros nascidos de parto simples ou duplo. Dezesseis cordeiros mestiços Texel × Ile de France, machos não castrados, foram desmamados aos 56 dias de idade e abatidos com aproximadamente 28kg de peso corporal. Imediatamente após o abate, cada componente corporal foi pesado separadamente, sendo as carcaças avaliadas após 24 horas de refrigeração a 2°C. Os cordeiros oriundos de parto simples apresentaram superioridade no peso e nos rendimentos da carcaça, além de maior área de olho de lombo. Por outro lado, proporcionalmente ao peso de corpo vazio, o rúmen é maior em cordeiros nascidos de parto duplo, o que resulta incremento da proporção de conteúdo gastrintestinal ao abate. Os resultados deste estudo indicam que, quando abatidos a um mesmo peso, cordeiros oriundos de parto simples possuem carcaças de melhor qualidade, em comparação a cordeiros nascidos de parto gemelar. [Carcass and non-carcass traits of single and twin lambs]. Abstract: An experiment was conducted to evaluate the carcass and non-carcass traits of single and twin lambs. Sixteen Texel × Ile de France crossbred, non-castrated male lambs were weaned at 56 days of age and slaughtered at 28kg of body weight. Immediately after the slaughter each body component was individually weighed, while carcasses were evaluated after a 24h period of refrigeration at 2°C. Single lambs presented higher values of carcass weight and carcass dressing percentage. Moreover, the Longissimus muscle area was also greater for single lambs. On the other hand, as a proportion of empty body weight, rumen was greater for twin lambs, increasing their gastrointestinal content at slaughter. The results of this study indicated that at a same slaughter weight single lambs have better quality carcasses in comparison with those from twin lambs

Análise sensorial mediante teste triangular da carne de cordeiros lactentes mantidos a pasto suplementados no creep feeding sem ou com glicerina bruta.

Publicado em: Synergismus scyentifica UTFPR, Pato Branco, v. 7, n. 1, 2012

On noise treatment in radio measurements of cosmic ray air showers

Precise measurements of the radio emission by cosmic ray air showers require an adequate treatment of noise. Unlike to usual experiments in particle physics, where noise always adds to the signal, radio noise can in principle decrease or increase the signal if it interferes by chance destructively or constructively. Consequently, noise cannot simply be subtracted from the signal, and its influence on amplitude and time measurement of radio pulses must be studied with care. First, noise has to be determined consistently with the definition of the radio signal which typically is the maximum field strength of the radio pulse. Second, the average impact of noise on radio pulse measurements at individual antennas is studied for LOPES. It is shown that a correct treatment of noise is especially important at low signal-to-noise ratios: noise can be the dominant source of uncertainty for pulse height and time measurements, and it can systematically flatten the slope of lateral distributions. The presented method can also be transfered to other experiments in radio and acoustic detection of cosmic rays and neutrinos.Comment: 4 pages, 6 figures, submitted to NIM A, Proceedings of ARENA 2010, Nantes, Franc

Perfil da textura da carne de cordeiros de dois grupos genéticos alimentados com diferentes níveis de inclusão de casca de soja.

Resumo: O objetivo do trabalho foi avaliar a textura da carne de cordeiros da raça Texel e Ideal alimentados com diferentes níveis de casca de soja na dieta. Foram utilizados 40 cordeiros machos não castrados, sendo 20 provenientes da raça Texel e 20 da raça Ideal. As dietas corresponderam a diferentes proporções de casca de soja (% MS) em substituição ao volumoso: (0%; 33,5%; 66,5% e 100% de casca de soja). O grupo genético afetou somente a elasticidade da carne (P<0,05), sendo superior para os animais da raça Ideal demostrando ser aproximadamente 9% mais elástica que a carne de cordeiros Texel. Os níveis de inclusão de casca de soja na dieta afetaram a dureza, gomosidade e mastigabilidade da carne, apresentando comportamento quadrático e ponto de máxima no nível de 66,5%, tornando a carne menos suculenta, menos macia, necessitando assim, maior força na mastigação. Embora a raça afete a elasticidade da carne, assim como a dieta contendo 66,5% de casca de soja as outras variáveis da textura, esses valores não depreciam a carne. ]Profile of the texture of lamb meat from two genetic groups fed with different inclusion levels of soybean hulls]. Abstract: The objective of this study was to evaluate the texture of lamb meat of the Texel breed and the Ideal breed fed with different levels of soybean hulls on the diet. Forty uncastrated male lambs, 20 from of the Texel breed and 20 from of the Ideal breed were used. The diets consisted of different proportions of soybean hulls (% DM) replacing the forage: (0%, 33.5%, 66.5% and 100% of soybean hulls). The genetic group has just affected the elasticity of the meat (P <0.05), being higher for the animals Ideal breed demonstrating to be about 9% more elastic than Texel lambs meat. The inclusion levels of soybean hulls in the diet affected the toughness, gumminess and chewiness of the meat, with quadratic response and maximum point at level of 66.5%, making meat less juicy, less softness, requiring bigger strength in chewing. Although the breed has affected the elasticity of the meat, even as the diet containing 66.5% of soybean hulls affecting other variables of the texture, these values didn?t depreciate the lamb?s meat

Investigation of the Properties of Galactic Cosmic Rays with the KASCADE-Grande Experiment

The properties of galactic cosmic rays are investigated with the KASCADE-Grande experiment in the energy range between $10^{14}$ and $10^{18}$ eV. Recent results are discussed. They concern mainly the all-particle energy spectrum and the elemental composition of cosmic rays.Comment: Proc. RICAP 09, Nucl. Instr. and Meth. in pres

The LOPES experiment - recent results, status and perspectives

The LOPES experiment at the Karlsruhe Institute of Technology has been taking radio data in the frequency range from 40 to 80 MHz in coincidence with the KASCADE-Grande air shower detector since 2003. Various experimental configurations have been employed to study aspects such as the energy scaling, geomagnetic dependence, lateral distribution, and polarization of the radio emission from cosmic rays. The high quality per-event air shower information provided by KASCADE-Grande has been the key to many of these studies and has even allowed us to perform detailed per-event comparisons with simulations of the radio emission. In this article, we give an overview of results obtained by LOPES, and present the status and perspectives of the ever-evolving experiment.Comment: Proceedings of the ARENA2010 conference, Nantes, Franc

The spectrum of high-energy cosmic rays measured with KASCADE-Grande

The energy spectrum of cosmic rays between 10**16 eV and 10**18 eV, derived from measurements of the shower size (total number of charged particles) and the total muon number of extensive air showers by the KASCADE-Grande experiment, is described. The resulting all-particle energy spectrum exhibits strong hints for a hardening of the spectrum at approximately 2x10**16 eV and a significant steepening at c. 8x10**16 eV. These observations challenge the view that the spectrum is a single power law between knee and ankle. Possible scenarios generating such features are discussed in terms of astrophysical processes that may explain the transition region from galactic to extragalactic origin of cosmic rays.Comment: accepted by Astroparticle Physics June 201

Energy Spectra of Elemental Groups of Cosmic Rays: Update on the KASCADE Unfolding Analysis

The KASCADE experiment measures extensive air showers induced by cosmic rays in the energy range around the so-called knee. The data of KASCADE have been used in a composition analysis showing the knee at 3-5 PeV to be caused by a steepening in the light-element spectra. Since the applied unfolding analysis depends crucially on simulations of air showers, different high energy hadronic interaction models (QGSJet and SIBYLL) were used. The results have shown a strong dependence of the relative abundance of the individual mass groups on the underlying model. In this update of the analysis we apply the unfolding method with a different low energy interaction model (FLUKA instead of GHEISHA) in the simulations. While the resulting individual mass group spectra do not change significantly, the overall description of the measured data improves by using the FLUKA model. In addition data in a larger range of zenith angle are analysed. The new results are completely consistent, i.e. there is no hint to any severe problem in applying the unfolding analysis method to KASCADE data.Comment: accepted for publication in Astroparticle Physic