Bovine viral diarrhoea virus in beef heifers in commercial herds in Australia: mob‐level seroprevalences and incidences of seroconversion,and vaccine efficacy     

JM Morton  NJ Phillips  LF Taylor  MR McGowan 《Australian veterinary journal》2013,91(12):517-524

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Failure of transfer of passive immunity and agammaglobulinaemia in calves in south‐west Victorian dairy herds: prevalence and risk factors     

Z Vogels  GM Chuck  JM Morton 《Australian veterinary journal》2013,91(4):150-158

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An initial evaluation of cattle showing clinical signs suggestive of malignant catarrhal fever in New Zealand and the results of a diagnostic quantitative PCR assay     

FI Hill  DJ Tisdall  JM Gill 《New Zealand veterinary journal》2013,61(5):302-303

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A Case of Successful Pregnancy in a Ewe with Uterus Didelphys     

DJ Carr  RP Aitken  JS Milne  AL David  JM Wallace 《Reproduction in domestic animals》2013,48(5):e78-e80

Uterus didelphys is a rare congenital abnormality of the reproductive tract. Although it occurs in various species, there are no published reports describing pregnancy outcome in association with this abnormality. Herein we describe a case of successful unilateral singleton pregnancy in a ewe incidentally found to have uterus didelphys during the course of a biomedical research study. The pregnancy was established using assisted reproductive techniques and interrupted in late gestation, at which point the abnormality was identified. Serial ultrasound assessment of foetal biometry revealed a normal foetal growth trajectory. Despite a 45% reduction in placentome number, total placentome weight was near normal secondary to compensatory placentome growth and development. To our knowledge, this is the first detailed report of normal foetal growth in an animal with uterus didelphys and illustrates the ability of the ovine placenta to adapt to a reduced number of placentomes and maintain foetal nutrient supply.  相似文献   

Estimating daytime subcanopy respiration from conditional sampling methods applied to multi-scalar high frequency turbulence time series   总被引：2，自引：0，他引：2  

C. Thomas  J.G. Martin  M. Goeckede  M.B. Siqueira  T. Foken  B.E. Law  H.W. Loescher  G. Katul 《Agricultural and Forest Meteorology》2008,148(8-9):1210-1229

This study presents a new method to estimate daytime respiration from the subcanopy of forests directly from conventional eddy covariance (EC) measurements. The method primarily considers the respiration signal from root, litter and microbial respiration, which are known to be the main components of ecosystem respiration, R_e, as well as decomposition of coarse and fine woody detritus, and respiration from low understory vegetation (forbs, herbs and grasses). The conceptual framework is based on the premise that upward moving air parcels carry a specific and unambiguous signal in their CO₂ and water vapour composition, which can be separated and distinguished into respiration and photosynthesis. The model employed a combination of conditional sampling methods, quadrant analysis and relaxed eddy accumulation with hyperbolic deadbands to identify respiration events and to quantify their flux contribution. Datasets from five sites, most of which had multiple sampling heights, were selected to test this technique among contrasting ecosystems and canopy structures.Respiration signals were successfully identified in daytime data of all sites. A hyperbolic deadband of size H = 0.25 applied to the plane constructed from perturbations of carbon dioxide c and water vapour q densities effectively separated the signals of respiration from photosynthesis. The time fraction of respiration events was ≤10% during daytime. The global correlation coefficient r_c,q was found to be a universal predictor of this time fraction and was therefore used as a filter to identify periods of a meaningful and extractable respiration signal. Coherent structures, defined as ramp-shaped flow pattern observed in time series in and above forest canopies, are likely to be the underlying transport mechanism for these respiration events.Daytime subcanopy R_e estimates derived from the new method agreed with those derived from: (i) the intercept of light-response curves and (ii) soil CO₂ efflux chambers for three of the five sites. Limitations were posed by the dense, multi-layered deciduous canopy and the intense vertical turbulent mixing at one coniferous site. In addition, refixation of respired CO₂ by the understorey (CO₂ recycling) may cause an underestimation of daytime R_e or pose a limitation to the method proposed here. An indicator relating the canopy shear length scale, L_s, to the adjustment length scale, L_d, was proposed to predict the skill of the new method, and found to be useful in four of the five sites. Analysis of vertical coupling in the plant canopy using exchange regimes could explain the failure of the new method for the remaining site.  相似文献   

In Vitro Fertilization (IVF) in Straws and a Short Gamete Coincubation Time Improves the Efficiency of Porcine IVF     

C Almiñana  MA Gil  C Cuello  I Caballero  J Roca  JM Vazquez  EA Martinez 《Reproduction in domestic animals》2008,43(6):747-752

The present study was designed to evaluate three different in vitro fertilization (IVF) systems: a straw‐IVF system with 10 min of coincubation, a straw‐IVF system with 6‐h coincubation and the microdrop‐IVF system with 6‐h coincubation (the traditional IVF system used routinely in most of IVF laboratories) in an attempt to reduce polyspermic penetration ( Experiment 1 ). When the straw‐IVF system was tested in combination with two coincubation times, the use of 10 min of coincubation significantly increased (p < 0.001) the penetration rate and the efficiency of fertilization (67.7 ± 6.4% vs 31.9 ± 6.5% and 41.5 ± 2.5% vs 17.6 ± 2.5% for 10 min and 6 h, respectively), while there were no significant differences in the incidence of monospermy between both systems (64.3 ± 5.1% and 67.7 ± 3.4%, for 10 min and 6 h, respectively). The penetration rate in the 6‐h microdrop‐IVF system was higher (93.8 ± 3.6%; p < 0.001) compared with the 10‐min straw‐IVF system (67.7 ± 6.4%), however, monospermy was severely reduced (25.0 ± 4.3% vs 67.7 ± 3.4%, for the 6‐h microdrop‐IVF system and 10‐min straw‐IVF system, respectively). The efficiency of the IVF showed similar values between microdrop and 6‐h straw‐IVF systems, but efficiency was significantly improved (p < 0.05) when the 10‐min straw‐IVF system was used. Experiment 2 was designed to compare porcine in vitro embryo production in two IVF systems, the 6‐h microdrop‐IVF system (1000 sperm per oocyte) and 10‐min straw‐IVF system (30 000 sperm per oocyte). The blastocyst formation rates tended (p = 0.06) to be higher when the 10‐min straw‐IVF system was used compared with the 6‐h microdrop‐IVF system. In addition, the number of total cells per blastocyst increased significantly (p < 0.05) in the 10‐min straw‐IVF system. These results showed that the 10‐min straw‐IVF system is an effective way to decrease polyspermic penetration, and improve the efficiency of fertilization and the quality of blastocysts in terms of cell number per embryo.  相似文献   

Isolations of avian paramyxovirus type 2 from domestic fowl in Scotland in 2002 and 2006     

Wood AM  Dagless MD  Pirie JO  Garcia-Rueda MC  Manvell RJ  Cox WJ  Ceeraz V  Pearson DB  Law WA  Alexander DJ  Brown IH 《The Veterinary record》2008,162(24):788-789

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A vesicular (blistering) skin condition in a dog following putative contact exposure to Plumbago auriculata          下载免费PDF全文

A Seavers  D Robson  JM Weingarth 《Australian veterinary journal》2016,94(8):290-292

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Local autonomy,national policy and global imperatives: sex work and HIV/AIDS in Cebu City,Philippines     

Lisa Law 《Asia Pacific viewpoint》1998,39(1):53-71

This paper contributes to cultural critiques of AIDS prevention policies through examining debates about mandatory HIV blood screening for women in Cebu City’s sex industry during 1993. These debates were inspired by the Department of Health’s national policy to eliminate mandatory blood screening on the grounds that it was expensive and ineffectual in slowing the spread of HIV. While the rhetoric of the debate was influenced by the emerging ‘global discourse’ on HIV/AIDS and human rights, the debate itself was always about local perceptions of women in the sex industry and Cebu’s administrative autonomy. This paper highlights how various socio-spatial scales helped to constitute Cebu’s response to mandatory testing, while at the same time reproducing an exclusionary discourse which silenced the voices of women in Cebu’s sex industry.  相似文献   

Ordering of ruthenium cluster carbonyls in mesoporous silica     

W Zhou  JM Thomas  DS Shephard  BFG Johnson  D Ozkaya  T Maschmeyer  RG Bell  Q Ge 《Science (New York, N.Y.)》1998,280(5364):705-708

The anionic ruthenium cluster carbonylates [Ru6C(CO)16]2- or [H2Ru10(CO)25]2- interspersed with bis(triphenylphosphino)iminium counterions (PPN+) are incorporated from solution into the pores of MCM-41 mesoporous silica (3 nanometers in diameter), where they form tightly packed arrays. These arrays were shown by high-resolution transmission electron microscopy, Fourier transform optical diffraction, and computer simulations to be well ordered both along and perpendicular to the axis of the cylindrical pores. In their denuded state produced by gentle thermolysis, the cluster carbonylates yield nanoparticles of ruthenium that are less well ordered than their assimilated precursors but show good activity as hydrogenation catalysts for hexene and cyclooctene. In both their as-prepared and denuded states, these encapsulated clusters are likely to exhibit interesting electronic and other properties.  相似文献