24-Hour Secretion Patterns of Plasma Oestradiol 17β in Pony Mares in Late Gestation     

LJ O'Donnell  BR Sheerin  JM Hendry  MJ Thatcher  WW Thatcher  MM LeBlanc 《Reproduction in domestic animals》2003,38(3):233-235

The mare exhibits nocturnal uterine contractions in the last 6 days of gestation. It is hypothesized that estradiol 17β (O17β) may be associated with the nightly increase in uterine contractions. The 24‐h secretion pattern of plasma O17β was measured in 3 pony mares in late gestation to identify changes in release as the mare neared parturition. Blood was collected weekly at 08:00 hours beginning on day 240 and every third day from day 330 until delivery. Serial blood samples were collected from each mare every 30‐min for 24‐h beginning on gestation day 310 and every sixth day thereafter until parturition. Concentrations of O17β were elevated at night with lowest concentrations occurring directly before sunset (p < 0.01). The natural log of the variance was increased at sunset (p < 0.01) and was decreased during the 6‐h period immediately after sunrise. This pattern was especially evident in the 6 days that preceded parturition. The contrast between nocturnal and daytime concentrations of O17β in the last 6 days of gestation may contribute to night‐time delivery in the mare.  相似文献   

Alzheimer type II astrocytes in the brains of pigs with salt poisoning (water deprivation/intoxication)     

JW Finnie  PC Blumbergs  MM Williamson 《Australian veterinary journal》2010,88(10):405-407

The finding of Alzheimer type II astrocytes, in addition to the pathognomonic combination of laminar cerebrocortical necrosis and eosinophil infiltration, in the brains of pigs is reported for the first time in cases of indirect salt poisoning following water deprivation.  相似文献   

Diagnostic ultrasound in veterinary practice: How safe is it?     

MM HORDER  SB BARNETT†  MJ EDWARDS 《Australian veterinary journal》1996,73(1):10-15

This paper provides information on the safety of ultrasonic diagnostic procedures as currently used in veterinary practice. The known mechanisms of action are described and selected literature on biological effects of ultrasound is reviewed. Current international consensus is presented on the safety of medical ultrasound with respect to thermal effects. To date, there is no independently verified clinical evidence that the level of exposure delivered to the tissues during scanned grey-scale (‘B-mode’) imaging has any adverse effects. Lung haemorrhage has been observed in animal experiments using diagnostic exposures, but the effects have not been reported in the foetus. Equipment that uses pulsed Doppler transmits higher acoustic outputs in a stationary beam, and can produce temperature increases that may have significant biological consequences. When considering sonographic and pulsed Doppler examinations of the prenatal animal, the safety margins are small and the operator should be aware of the acoustic output of the equipment, the exposure time, and the sensitivity of target tissues.  相似文献   

Endocarditis caused by Pasteurella caballi in a horse     

S. CHURCH  KE HARRIGAN  AE IRVING  MM PEEL 《Australian veterinary journal》1998,76(8):528-530

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Factors affecting colostrum quality in Australian pasture‐based dairy herds          下载免费PDF全文

GM Chuck  PD Mansell  MA Stevenson  MM Izzo 《Australian veterinary journal》2017,95(11):421-426

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Prevalence of antibodies to Neospora caninum in the serum of camels (Camelus dromedarius) from central Punjab,Pakistan     

Nazir  Muhammad Mudasser  Oneeb  Muhammad  Ayaz  Muhammad Mazhar  Bibi  Fehmeeda  Ahmad  Atif Nisar  Waheed  Abdul  Sajid  Muhammad Afzal  Sultan  Muhammad Tauseef  Yasin  Ghulam  Lindsay  David S. 《Tropical animal health and production》2017,49(5):1081-1084

Tropical Animal Health and Production - Infection with the Apicomplexan parasite Neospora caninum occurs in domestic and wild animals worldwide. This parasite causes significant economic losses in...  相似文献   

Serum antibody response to Mycoplasma hyopneumoniae measured by enzyme-linked immunosorbent assay after experimental and natural infection of pigs   总被引：1，自引：0，他引：1  

RF SHELDRAKE  IA GARDNER  MM SAUNDERS  LF ROMALIS 《Australian veterinary journal》1990,67(2):39-42

Studies were conducted under experimental and field conditions to determine the effect of infection with M. hyopneumoniae on the immune response in serum as measured by ELISA. Following intratracheal challenge or contact exposure, serologically negative pigs derived from mycoplasma-free piggeries developed an immune response within 10 days. This response continued to rise for a further 50 days. In a field study in a commercial piggery, no animals (0/44) were observed to have M. hyopneumoniae antibodies at day 86 of life. However between day 86 and day 144, 97.7% (42/43) animals sero-converted. These results are discussed in terms of infection spread, particularly in the grower/finisher shed.  相似文献   

Differentiation of Australian isolates of Mycobacterium paratuberculosis using pulsed-field gel electrophoresis     

MM FEIZABADI  ID ROBERTSON  A HOPE  DV COUSINS  DJ HAMPSON 《Australian veterinary journal》1997,75(12):887-889

Objectives To examine strain variation amongst Australian isolates of Mycobacterium paratuberculosis .
Design Pulsed field gel electrophoresis was optimised for differentiation of M paratuberculosis strains, and this typing technique was then applied to a collection of Australian isolates.
Procedure DNAs from 35 Australian isolates of M para-tuberculosis and a UK reference strain were digested with one or other of three restriction endonucleases. The banding patterns obtained after pulsed field gel electrophoresis of the DNA fragments were compared.
Results The Australian isolates were divided into two groups on the basis of their DNA banding pattern. Both were different from the UK reference strain. Seven isolates from cattle in Victoria and the Northern Territory had the same pattern as five isolates from alpacas in Victoria and Western Australia. Another 20 isolates from cattle in Victoria, Western Australia and the Northern Territory had the same pattern as isolates from two sheep and a goat in New South Wales.
Conclusion Pulsed field gel electrophoresis was a useful tool for strain typing of M paratuberculosis , and could be used to study the transmission of strains in Australia.  相似文献   

Comparison of Stereoscopy, Light Microscopy and Ultrastructural Methods for Evaluation of Bovine Embryos   总被引：2，自引：0，他引：2  

MM Aguilar  CS Galina  H Merchant  F Montiel  R Canseco  YC Márquez 《Reproduction in domestic animals》2002,37(6):341-346

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First glimpse into the origin and spread of the Asian longhorned tick,Haemaphysalis longicornis,in the United States     

Andrea Egizi  Leslie Bulaga‐Seraphin  Erika Alt  Waheed I. Bajwa  Joshua Bernick  Matthew Bickerton  Scott R. Campbell  Neeta Connally  Kandai Doi  Richard C. Falco  David N. Gaines  Telleasha L. Greay  Vanessa L. Harper  Allen C.G. Heath  Ju Jiang  Terry A. Klein  Lauren Maestas  Thomas N. Mather  James L. Occi  Charlotte L. Oskam  Jennifer Pendleton  Marissa Teator  Alec T. Thompson  Danielle M. Tufts  Rika Umemiya‐Shirafuji  Meredith C. VanAcker  Michael J. Yabsley  Dina M. Fonseca 《Zoonoses and public health》2020,67(6):637-650

Established populations of Asian longhorned ticks (ALT), Haemaphysalis longicornis, were first identified in the United States (US) in 2017 by sequencing the mitochondrial cytochrome c oxidase subunit I (cox1) ‘barcoding’ locus followed by morphological confirmation. Subsequent investigations detected ALT infestations in 12, mostly eastern, US states. To gain information on the origin and spread of US ALT, we (1) sequenced cox1 from ALT populations across 9 US states and (2) obtained cox1 sequences from potential source populations [China, Japan and Republic of Korea (ROK) as well as Australia, New Zealand and the Kingdom of Tonga (KOT)] both by sequencing and by downloading publicly available sequences in NCBI GenBank. Additionally, we conducted epidemiological investigations of properties near its initial detection locale in Hunterdon County, NJ, as well as a broader risk analysis for importation of ectoparasites into the area. In eastern Asian populations (China/Japan/ROK), we detected 35 cox1 haplotypes that neatly clustered into two clades with known bisexual versus parthenogenetic phenotypes. In Australia/New Zealand/KOT, we detected 10 cox1 haplotypes all falling within the parthenogenetic cluster. In the United States, we detected three differentially distributed cox1 haplotypes from the parthenogenetic cluster, supporting phenotypic evidence that US ALT are parthenogenetic. While none of the source populations examined had all three US cox1 haplotypes, a phylogeographic network analysis supports a northeast Asian source for the US populations. Within the United States, epidemiological investigations indicate ALT can be moved long distances by human transport of animals, such as horses and dogs, with smaller scale movements on wildlife. These results have relevant implications for efforts aimed at minimizing the spread of ALT in the United States and preventing additional exotic tick introductions.  相似文献