DESEMPENHO PRODUTIVO DE QUATRO GRUPOS GENÉTICOS DE CODORNAS (Coturnix sp.) PARA CORTE

A trial was conducted with the objective to evaluate growth performance, carcass yield, and slaughtering age of four genetic groups of meat quail, of both sexes, raised from 1 to 77 days and slaughtered weekly from 35 to 77 days. The experiment utilized 1984 birds, in a completely randomised design, with a factorial of 2 genders and 4 families (A, B, C and D), in a total of 8 treatments with 4 replicates of 62 birds each. Body weight of female quail at 28 days was higher than other ages independently of family. Family A was heavier than family B at 35, 56 and 77 days. At 42 days of age female showed higher feed consumption and low feed conversion than male. Considering the results as a whole, the best slaughtering age for both genders was 49 days. Key-words: genetic group, growing performance, meat quail, production, slaughtering age.Para avaliar o desempenho produtivo, o rendimento de carcaça e a melhor idade de abate de quatro grupos genéticos de codornas machos e fêmeas para corte, criadas de 1 a 77 dias e abatidas semanalmente de 35 a 77 dias, utilizaram-se 1984 aves, distribuídas aleatoriamente em um delineamento inteiramente casualizado, com esquema fatorial de 2 sexos x 4 famílias (A, B, C e D), num total de 8 tratamentos com 4 repetições de 62 aves cada. A partir dos 28 dias as fêmeas foram mais pesadas do que os machos, independentemente da família. A família A foi mais pesada do que a B aos 35, 56 e 77 dias. A partir dos 42 dias, as fêmeas tiveram maior consumo, mas melhor conversão alimentar do que os machos. Considerando-se conjuntamente os dados de desempenho, a melhor idade de abate para ambos os sexos foi 49 dias

AVALIAÇÃO DO RENDIMENTO DE CARCAÇA DE CODORNAS PARA CORTE ALIMENTADAS COM DIETAS COM DIFERENTES NÍVEIS PROTÉICOS

An experiment has been carried out aiming to evaluate the carcass yield of male and female meat quails fed with diets containing 20, 22, 24, and 26% of crude protein (CP), respectively, all of them displaying the same caloric and lysine levels. A total of 960 quails were used in a completely randomized design, with a factorial of 2 genders and 4 levels of CP, totalizing 8 treatments with 4 replicates of 30 birds each. Carcass yield was evaluated at the end of 49 days of the beginning of the experiment. The levels of CP used in this trial did not display any significant effect on most of the studied parameters. It has been observed an interaction (p < 0.05) for the yield of edible viscera, with females fed with 22% CP displaying higher averages than those fed with 24% CP. There was no effect on the protein levels upon males. Body and carcass weights and non-edible viscera yield were higher in females, while carcass and post chilling yields were higher in males (P < 0.05).Utilizaram-se 960 codornas, distribuídas num delineamento inteiramente aleatorizado com esquema fatorial de 2 sexos x 4 níveis de proteína bruta (PB), sendo as dietas isocalóricas e isolisínicas, num total de 8 tratamentos com 4 repetições de 30 aves cada, para avaliar o rendimento de carcaça de codornas para corte, machos e fêmeas, alimentadas com rações contendo 20%, 22%, 24% e 26% PB, de 1 a 49 dias. Os níveis de proteína bruta não afetaram significativamente a maioria das variáveis estudadas. Os pesos vivo e de carcaça e o rendimento de vísceras não comestíveis foram superiores nas fêmeas; o rendimentos de carcaça e o rendimento resfriado foram superiores nos machos (

Measurement of the p-pbar -> Wgamma + X cross section at sqrt(s) = 1.96 TeV and WWgamma anomalous coupling limits

The WWgamma triple gauge boson coupling parameters are studied using p-pbar -> l nu gamma + X (l = e,mu) events at sqrt(s) = 1.96 TeV. The data were collected with the DO detector from an integrated luminosity of 162 pb^{-1} delivered by the Fermilab Tevatron Collider. The cross section times branching fraction for p-pbar -> W(gamma) + X -> l nu gamma + X with E_T^{gamma} > 8 GeV and Delta R_{l gamma} > 0.7 is 14.8 +/- 1.6 (stat) +/- 1.0 (syst) +/- 1.0 (lum) pb. The one-dimensional 95% confidence level limits on anomalous couplings are -0.88 < Delta kappa_{gamma} < 0.96 and -0.20 < lambda_{gamma} < 0.20.Comment: Submitted to Phys. Rev. D Rapid Communication

Measurement of the ttbar Production Cross Section in ppbar Collisions at sqrt{s} = 1.96 TeV using Kinematic Characteristics of Lepton + Jets Events

We present a measurement of the top quark pair ttbar production cross section in ppbar collisions at a center-of-mass energy of 1.96 TeV using 230 pb**{-1} of data collected by the DO detector at the Fermilab Tevatron Collider. We select events with one charged lepton (electron or muon), large missing transverse energy, and at least four jets, and extract the ttbar content of the sample based on the kinematic characteristics of the events. For a top quark mass of 175 GeV, we measure sigma(ttbar) = 6.7 {+1.4-1.3} (stat) {+1.6- 1.1} (syst) +/-0.4 (lumi) pb, in good agreement with the standard model prediction.Comment: submitted to Phys.Rev.Let

Measurement of the ttbar Production Cross Section in ppbar Collisions at sqrt(s)=1.96 TeV using Lepton + Jets Events with Lifetime b-tagging

We present a measurement of the top quark pair ($t\bar{t}$) production cross section ($\sigma_{t\bar{t}}$) in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV using 230 pb$^{-1}$ of data collected by the D0 experiment at the Fermilab Tevatron Collider. We select events with one charged lepton (electron or muon), missing transverse energy, and jets in the final state. We employ lifetime-based b-jet identification techniques to further enhance the $t\bar{t}$ purity of the selected sample. For a top quark mass of 175 GeV, we measure $\sigma_{t\bar{t}}=8.6^{+1.6}_{-1.5}(stat.+syst.)\pm 0.6(lumi.)$ pb, in agreement with the standard model expectation.Comment: 7 pages, 2 figures, 3 tables Submitted to Phys.Rev.Let

Search for W' bosons decaying to an electron and a neutrino with the D0 detector

This Letter describes the search for a new heavy charged gauge boson W' decaying into an electron and a neutrino. The data were collected with the D0 detector at the Fermilab Tevatron proton-antiproton Collider at a center-of-mass energy of 1.96 TeV, and correspond to an integrated luminosity of about 1 inverse femtobarn. Lacking any significant excess in the data in comparison with known processes, an upper limit is set on the production cross section times branching fraction, and a W' boson with mass below 1.00 TeV can be excluded at the 95% C.L., assuming standard-model-like couplings to fermions. This result significantly improves upon previous limits, and is the most stringent to date.Comment: submitted to Phys. Rev. Let

Measurement of the ratios of the Z/G* + >= n jet production cross sections to the total inclusive Z/G* cross section in ppbar collisions at sqrt(s) = 1.96 TeV

We present a study of events with Z bosons and jets produced at the Fermilab Tevatron Collider in ppbar collisions at a center of mass energy of 1.96 TeV. The data sample consists of nearly 14,000 Z/G* -> e+e- candidates corresponding to the integrated luminosity of 0.4 fb-1 collected using the D0 detector. Ratios of the Z/G* + >= n jet cross sections to the total inclusive Z/G* cross section have been measured for n = 1 to 4 jet events. Our measurements are found to be in good agreement with a next-to-leading order QCD calculation and with a tree-level QCD prediction with parton shower simulation and hadronization.Comment: 7 pages, 2 figures, slightly modified, submitted to Phys. Lett.

Measurement of the Isolated Photon Cross Section in p-pbar Collisions at sqrt{s}=1.96 TeV

The cross section for the inclusive production of isolated photons has been measured in p anti-p collisions at sqrt{s}=1.96 TeV with the D0 detector at the Fermilab Tevatron Collider. The photons span transverse momenta 23 to 300 GeV and have pseudorapidity |eta|<0.9. The cross section is compared with the results from two next-to-leading order perturbative QCD calculations. The theoretical predictions agree with the measurement within uncertainties.Comment: 7 pages, 5 figures, submitted to Phys.Lett.