308 research outputs found
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
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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 () production cross
section () in collisions at TeV
using 230 pb 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
purity of the selected sample. For a top quark mass of 175 GeV, we
measure 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.
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