Wie viel Arbeit macht die Aufzucht von Ökologischen Junghennen? Arbeitwirtschaftlicher Vergleich der konventionellen und ökologischen Aufzucht von Legehennen

Organic pullets are reared with daylight and are not beak-trimmed. Therefore, certain provisions are needed in order to prevent feather-pecking and cannibalism. Respec-tive guidelines are set by the German Organic Associations. It was the goal of this study to investigate whether the higher rearing standards are associated with an increased labour demand compared to conventional rearing systems. Using a ques-tionnaire, data from 32 hen-houses (10 conventional and 6 organic barn systems, 10 conventional and 6 organic aviary systems) about duration and number of working procedures were collected and exemplary models calculated. Total labour demand was between 2.36 and 7.37 worker`s hours/100 pullets. It did not differ between or-ganic and conventional rearing when comparing similar flock sizes, but were partly differently allocated to the different working procedures. On average, organic farms had smaller flocks, and there was a large influence of flock size on labour demand with small houses requiring most labour per hen. Also aviaries were more labour demanding than barn systems, but were usually associated with higher flock sizes. Our results indicate that improved pullet rearing that allows the birds to perform their natural behaviour more completely, does not necessarily cause higher labour re-quirements

From Linear Optical Quantum Computing to Heisenberg-Limited Interferometry

The working principles of linear optical quantum computing are based on photodetection, namely, projective measurements. The use of photodetection can provide efficient nonlinear interactions between photons at the single-photon level, which is technically problematic otherwise. We report an application of such a technique to prepare quantum correlations as an important resource for Heisenberg-limited optical interferometry, where the sensitivity of phase measurements can be improved beyond the usual shot-noise limit. Furthermore, using such nonlinearities, optical quantum nondemolition measurements can now be carried out at the single-photon level.Comment: 10 pages, 5 figures; Submitted to a Special Issue of J. Opt. B on "Fluctuations and Noise in Photonics and Quantum Optics" (Herman Haus Memorial Issue); v2: minor change

Aqueous Processes and Microbial Habitability of Gale Crater Sediments from the Blunts Point to the Glenn Torridon Clay Unit

A driving factor for sending the Mars Science Laboratory, Curiosity rover to Gale Crater was the orbital detection of clay minerals in the Glen Torridon (GT) clay unit. Clay mineral detections in GT suggested a past aqueous environment that was habitable, and could contain organic evidence of past microbiology. The mission of the Sample Analysis at Mars (SAM) instrument onboard Curiosity was to detect organic evidence of past microbiology and to detect volatile bearing mineralogy that can inform on whether past geochemical conditions would have supported microbiological activity. The objective of this work was to 1) evaluate the depositional/alteration conditions of Blunts Point (BP) to GT sediments 2) search for evidence of organics, and 3) evaluate microbial habitability in the BP, Vera Rubin Ridge (VRR), and GT sedimentary rock

Cryotolerance and pregnancy rates after exposure of bovine in vitro-produced embryos to forskolin and linoleic acid before vitrification.

The objective of the present study was to evaluate the effects of supplementation of in vitro culture (IVC) medium with drugs that stimulates the lipolysis (Forskolin: Forsk) and inhibit the lipogenesis (Linoleic Acid LA) on the intracytoplasmic lipid content and cryotolerance of bovine embryos (Experiment 1), as well as to evaluate the effect of treatment of embryos with Forsk on the pregnancy rates after transfer to synchronized recipients (Experiment 2).Proceedings of the 30th Annual Meeting of the Brazilian Embryo Technology Society (SBTE); Foz do Iguaçu, PR, Brazil, August 25th to 27th, 2016, and 32nd Meeting of the European Embryo Transfer Association (AETE); Barcelona, Spain, September 9th and 10th, 2016. A327 Support Biotechnologies: Cryopreservation and cryobiology, diagnosis through imaging, molecular biology and ?omics?. Título em português: Criotolerância e taxa de concepção após exposição de embriões bovinos produzidos in vitro ao Forskolin ou ácido linoleico antes da vitrificação

Junghennen - Arbeitszeitvergleich praxisüblicher Haltungsverfahren

Dieses KTBL-Heft informiert über den Arbeitszeitbedarf in der Junghennenhaltung. In Abhängigkeit vom Haltungssverfahren, der Bestandgröße und der Vermarktungsform für konventionell und ökologisch wirtschaftenden Betriebe wurden Arbeitszeitwerte in der Praxis erfasst und daraus auf der Basis von Modellrechnungen Arbeitszeitbedarfswerte abgeleitet. Die ermittelten Arbeitszeitbedarfswerte liefern Junghennenhaltern für Neu- und Umbaumaßnahmen Vergleichswerte und ermöglichen ihnen eine fundierte PLanung ihrer Arbeitskapazitäten

Photon Number Statistics of Multimode Parametric Down-Conversion

We experimentally analyze the complete photon number statistics of parametric downconversion and ascertain the influence of multimode effects. Our results clearly reveal a difference between single mode theoretical description and the measured distributions. Further investigations assure the applicability of loss-tolerant photon number reconstruction and prove strict photon number correlation between signal and idler modes.Comment: 5 pages, 3 figure

Measuring measurement

Measurement connects the world of quantum phenomena to the world of classical events. It plays both a passive role, observing quantum systems, and an active one, preparing quantum states and controlling them. Surprisingly - in the light of the central status of measurement in quantum mechanics - there is no general recipe for designing a detector that measures a given observable. Compounding this, the characterization of existing detectors is typically based on partial calibrations or elaborate models. Thus, experimental specification (i.e. tomography) of a detector is of fundamental and practical importance. Here, we present the realization of quantum detector tomography: we identify the optimal positive-operator-valued measure describing the detector, with no ancillary assumptions. This result completes the triad, state, process, and detector tomography, required to fully specify an experiment. We characterize an avalanche photodiode and a photon number resolving detector capable of detecting up to eight photons. This creates a new set of tools for accurately detecting and preparing non-classical light.Comment: 6 pages, 4 figures,see video abstract at http://www.quantiki.org/video_abstracts/0807244

Respuesta inmune humoral en vaquillonas vacunadas contra Tritrichomonas foetus y desafiadas con toros infectados

Se evaluó el efecto de una vacuna oleosa a célula entera de Tritrichomonas foetus (108/dosis) en vaquillonas desafiadas con toros infectados. Veintitrés vaquillonas fueron divididas en grupo 1 (n=11) control sin vacunar y grupo 2 (n=12) inmunizadas en dos oportunidades por vía subcutánea. El grupo 2 se subdividió en 2 subgrupos de 6 animales cada uno, los cuales recibieron un tercer refuerzo vacunal por vías vaginal y vaginal e intranasal, respectivamente. Todas las vacunaciones se hicieron con 21 días de intervalo. A las 3 semanas de la última dosis, las vaquillonas fueron servidas durante 90 días con 2 toros infectados con T. foetus. Quincenalmente, hasta los 4 meses post servicio, se recolectó sangre para medir IgG y mucus cérvico vaginal (MCV) para cultivo y evaluación de IgG e IgA. La cuantificación de Ig se hizo por el test ELISA. La duración promedio de la infección para las vaquillonas vacunadas y controles fue de 44,9 días y 78,5 días, respectivamente (p<0,05). La parición fue de 8/12 (66,6%) para los animales vacunadosy 3/11 (27,3%) para los controles (p<0,05). Los valores ELISA séricos (VE) tuvieron unincremento luego de la segunda dosis vacunal (p<0,05) mientras que la IgA en el MCV fue significativamente superior en vacunados que en controles (p<0,05), desde final del servicio hasta los 4 meses post servicio. No se observaron diferencias en los VE séricos ni en el MCV entre animales vacunados vías nasal y nasal e intravaginal. Se confirma la importancia de la estimulación vacunal sistémica y mucosal con antígenos de T. foetus con incrementos de la IgG sérica y de la IgA en el MCV acortando el período de infección y mejorando la eficiencia reproductiva en los animales vacunados. El método ELISA fue adecuado para la evaluación de la respuesta inmune en hembras infectadas y/o vacunadas

Avalanche Photo-Detection for High Data Rate Applications

Avalanche photo detection is commonly used in applications which require single photon sensitivity. We examine the limits of using avalanche photo diodes (APD) for characterising photon statistics at high data rates. To identify the regime of linear APD operation we employ a ps-pulsed diode laser with variable repetition rates between 0.5MHz and 80MHz. We modify the mean optical power of the coherent pulses by applying different levels of well-calibrated attenuation. The linearity at high repetition rates is limited by the APD dead time and a non-linear response arises at higher photon-numbers due to multiphoton events. Assuming Poissonian input light statistics we ascertain the effective mean photon-number of the incident light with high accuracy. Time multiplexed detectors (TMD) allow to accomplish photon- number resolution by photon chopping. This detection setup extends the linear response function to higher photon-numbers and statistical methods may be used to compensate for non-linearity. We investigated this effect, compare it to the single APD case and show the validity of the convolution treatment in the TMD data analysis.Comment: 16 pages, 5 figure

Detection of Siderite (FeCO3) in Glen Torridon Samples by the Mars Science Laboratory Rover

Siderite (FeCO3) has been detected in Gale Crater for the first time by the Mars Science Laboratory (MSL) Curiosity and is seen in multiple samples in the Glen Torridon (GT) region. The identification of siderite is based on evolved gas analysis (EGA) data from the Sample Analysis at Mars (SAM) instrument and X-ray diffraction (XRD) data from the Chemistry and Mineralogy (CheMin) instrument. Curiosity descended off of the Vera Rubin ridge (VRR) into the Glen Torridon region on Sol 2300. Glen Torridon is of particular interest because a strong clay mineral signature had been detected by orbital instruments [1]. To date, four drilled samples have been collected at two different drill locations: Kilmarie and Aberlady from adjacent blocks at the base of the south side of VRR in the Jura member and Glen Etive 1 and 2 on the same block in the Knockfarril member