393 research outputs found
Effects of an intravaginal GnRH analogue administration on rabbit reproductive parameters and welfare
Abstract On commercial farms, rabbit does are subjected to a reproductive rhythm that does not account for their welfare or physiology, leading to reduced longevity and consequently high annual replacement. The European Food Safety Authority (EFSA) recommends limited and infrequent use of hormone treatments, and suggests replacement with alternative methods that do not threaten animal welfare when possible. In the present study, we aimed to determine whether the GnRH analogue lecirelin acetate could be administered by inclusion in the seminal dose during insemination. Twenty 9-month-old does (Grigio del Monferrato, autochthonous Italian breed),each having two previous deliveries, were individually housed and divided into two groups at artificial insemination. The control group received 0.2 mL of intramuscular lecirelin (Dalmarelin, Fatro®, Italy) prior to insemination. The intravaginal group was inseminated with a seminal dose that included 0.3 mL Dalmarelin. The experiment was performed for six consecutive reproductive cycles at 42-day intervals, and included a total of 120 inseminations. Prior to each insemination, the heterospermic pooled semen samples were assessed for sperm motility and morphology. Each ejaculate was divided into two samples, with and without lecirelin addition. Compared to the control group, the does with intravaginal Dalmarelin administration showed equal or greater sexual receptivity, which resulted in a higher fertility rate over increasing cycles. The seminal dose volume was very low, possibly explaining the better results in the intravaginal group, which received a similar amount of hormone (0.3 mL/doe) as the control group (0.2 mL/doe). The negative performance of the control group may have also been due to anti-GnRH formation, and the more stressful method of ovulation induction. The number of live-born kits did not significantly differ between groups. Progressive motility was significantly positively correlated with motility characteristics, including VAP, VSL, ALH, BCF, STR, and LIN. Overall, our present findings supported that the incorporation of GnRH in a seminal dose could be used for ovulation induction in rabbit does. Further studies should identify the optimal dose of GnRH for intravaginal administration, taking into account that the intravaginal absorption capacity is about 10 times smaller than the intramuscular absorption capacity
Gas Analysis and Monitoring Systems for the RPC Detector of CMS at LHC
The Resistive Plate Chambers (RPC) detector of the CMS experiment at the LHC
proton collider (CERN, Switzerland) will employ an online gas analysis and
monitoring system of the freon-based gas mixture used. We give an overview of
the CMS RPC gas system, describe the project parameters and first results on
gas-chromatograph analysis. Finally, we report on preliminary results for a set
of monitor RPC.Comment: 9 pages, 8 figures. Presented by Stefano Bianco (Laboratori Nazionali
di Frascati dell'INFN) at the IEEE NSS, San Diego (USA), October 200
EQCM behavior of copper anodes in alkaline medium and characterization of the electrocatalysis of ethanol oxidation by Cu(III)
The CMS RPC gas gain monitoring system: an overview and preliminary results
The status of the CMS RPC Gas Gain Monitoring (GGM) system developed at the
Frascati Laboratory of INFN (Istituto Nazionale di Fisica Nucleare) is reported
on. The GGM system is a cosmic ray telescope based on small RPC detectors
operated with the same gas mixture used by the CMS RPC system. The GGM gain and
efficiency are continuously monitored on-line, thus providing a fast and
accurate determination of any shift in working point conditions. The
construction details and the first result of GGM commissioning are described.Comment: 8 pages, 9 figures, uses lnfprepCMS.sty, presented by L. Benussi at
RPC07, Mumbai, INDIA 200
Gas analysis and monitoring systems for the RPC detector of CMS at LHC
1-9, arXiv:physics/0701014. Publisher: Los AlamosNational Laboratoty, CODEN: LNPHF9
available at
http://arxiv.org/PS_cache/physics/pdf/0701/0701014v1.pd
Proposal for a systematic study of the CERN Closed Loop gas system used by the RPC muon detectors in CMS
http://www.lnf.infn.it/sis/preprint/pdf/getfile.php?filename=LNF-06-27(IR).pd
Performance of the CMS Cathode Strip Chambers with Cosmic Rays
The Cathode Strip Chambers (CSCs) constitute the primary muon tracking device
in the CMS endcaps. Their performance has been evaluated using data taken
during a cosmic ray run in fall 2008. Measured noise levels are low, with the
number of noisy channels well below 1%. Coordinate resolution was measured for
all types of chambers, and fall in the range 47 microns to 243 microns. The
efficiencies for local charged track triggers, for hit and for segments
reconstruction were measured, and are above 99%. The timing resolution per
layer is approximately 5 ns
Muon detection in electron-positron annihilation for muon collider studies
The investigation of the energy frontier in physics requires novel concept for future colliders. The idea of a muon collider is very appealing since it would aim to study particle collisions up to tens of TeV energy while offering a cleaner experimental environment with respect to hadronic colliders. One key element in the muon collider design is muon production with small emittance. Recently, the Low EMittance Muon Accelerator (LEMMA) collaboration has explored the close-to-threshold muon production by 45 GeV positron annihilating in a low Z material target. Muons are emerging with a natural small emittance. In this paper we describe the performance of a system of segmented absorbers with alternating active layers realized with fast Cherenkov detectors and a muon identification technique based on it. Passive layers were made of tungsten. Muons and electron beams data were collected in September 2018 at the H2 line in the North Area of the Conseil Européen pour la Recherche Nucléaire (CERN)
Performance and Operation of the CMS Electromagnetic Calorimeter
The operation and general performance of the CMS electromagnetic calorimeter
using cosmic-ray muons are described. These muons were recorded after the
closure of the CMS detector in late 2008. The calorimeter is made of lead
tungstate crystals and the overall status of the 75848 channels corresponding
to the barrel and endcap detectors is reported. The stability of crucial
operational parameters, such as high voltage, temperature and electronic noise,
is summarised and the performance of the light monitoring system is presented
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