Bovine Leukocyte Adhesion Deficiency in Danish Holstein-Friesian Cattle: I. PCR Screening and Allele Frequency Estimation     

C.B. Jrgensen  J.S. Agerholm  J. Pedersen  P.D. Thomsen 《Acta veterinaria Scandinavica》1993,34(3):231

Jergensen, C. B., J. S. Agerholm, J. Pedersen and P. D. Thomsen: Bovine leukocyte adhesion deficiency in Danish Holstein-Friesian Cattle I. PCR screening and allele frequency estimation. Acta vet. Scand. 1993,34,231-236.–A screening program for bovine leukocyte adhesion deficiency (BLAD) in Danish Holstein-Friesian cattle has been initiated. During the first months 1611 animals were tested by a PCR based assay. Of these animals 1256, 346, and 8 were assigned normal, BLAD carriers, and BLAD affected animals, respectively One bull, born as a co-twin, showed weak reaction for the BLAD allele on DNA isolated from leukocytes, but a normal genotype on DNA isolated from semen. Chromosome analysis showed that this bull was a blood chimaera. Estimation of the BLAD allele frequency upon the PCR test results showed that around 450 Danish calves born in 1991 might have been affected with the recessive disorder.  相似文献   

A survey of northern Victorian dairy farmers to investigate dairy calf management: colostrum feeding and management          下载免费PDF全文

AJ Phipps  DS Beggs  AJ Murray  PD Mansell  MF Pyman 《Australian veterinary journal》2018,96(4):101-106

Objectives

To describe colostrum management practices carried out in northern Victorian dairy herds and to identify weaknesses in these areas that may affect calf health and welfare by comparing the results with the current industry recommendations

Methods

A questionnaire to obtain information about colostrum management and calf‐rearing practices was sent to commercial dairy farming clients of Rochester Veterinary Practice between June and September 2013. The questionnaire consisted of a general herd overview and colostrum harvesting practices.

Results

The response rate was 39% (58/150). Many dairy producers were not meeting the current industry recommendations in the following areas: (1) time of removal calf from the dam, (2) relying on calf suckling colostrum from the dam to achieve adequate passive transfer, (3) failing to supplement calves with colostrum, (4) feeding inadequate volumes of colostrum, (5) delayed colostrum harvesting, (6) pooling of colostrum, (7) failing to objectively assess colostrum quality or relying on visual assessment and (8) storing colostrum for a prolonged periods of time at ambient temperatures.

Conclusion

The results from this survey highlight the need for greater awareness of industry standards for colostrum management and feeding hygiene.

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BVDV in Australian alpacas: natural infection and clinical profiles following co‐mingling with a persistently infected heifer          下载免费PDF全文

CA Evans  E Erregger  F Hemmatzadeh  PD Cockcroft 《Australian veterinary journal》2018,96(7):262-268

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Seroprevalence of antibodies to Pestivirus infections in South Australian sheep flocks          下载免费PDF全文

CA Evans  SR Lanyon  RM O’Handley  MP Reichel  PD Cockcroft 《Australian veterinary journal》2018,96(8):312-314

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Loser cows in Danish dairy herds: definition, prevalence and consequences     

Thomsen PT  Østergaard S  Sørensen JT  Houe H 《Preventive veterinary medicine》2007,79(2-4):116-135

During the last few years, many Danish dairy farmers have expressed increasing concerns regarding a group of cows, which we have chosen to term ‘loser cows’. Until now, a loser cow has not been described scientifically. We defined a loser cow on the basis of a clinical examination of the cow. A total of 15,151 clinical examinations were made on 6,451 individual cows from 39 randomly selected, large Danish dairy herds with loose-housing systems using a clinical protocol. Scores for the clinical signs lameness, body condition, hock lesions, other cutaneous lesions, vaginal discharge, condition of hair coat and general condition were converted into a loser cow score. Cows with a loser cow score of 8 or more were classified as loser cows. The overall prevalence of loser cows was 2.15%, 4.50% and 2.98% during the first, second and third round of herd visits, respectively.

The associations between the loser cow state and milk production, mortality, morbidity, culling and workload for the farmer were evaluated using data from herd visits and from the Danish Cattle Database and a number of different statistical techniques. It was concluded that the loser cow state has significant negative consequences for both the farmer and the cow. On average, loser cows yielded 0.61 to 2.24 kg energy corrected milk less per day than non-loser cows depending on parity. Hazard ratio for death or euthanasia was 5.69 for loser cows compared to non-loser cows. Incidence rate ratio for disease treatments was 0.69 for non-loser cows compared to loser cows. Loser cows were often culled in an ‘unfavourable’ way and generally caused extra workload for the farmer.

A simplified version of the loser cow score was evaluated and is recommended for future research and use in practice.  相似文献   

Ostreid herpesvirus-1 microvariant surveillance in Pacific oysters (Magallana gigas,Thunberg, 1793) in Australia in 2011     

BJ Moloney  M Deveney  K Ellard  P Hick  PD Kirkland  NJG Moody  J Frances 《Australian veterinary journal》2023,101(9):345-355

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Sex Determination of Bovine Embryo Biopsies Using in situ Hybridization*     

P.D. Thomsen  M. Schwerin  P.H. Poulsen  B. Avery 《Reproduction in domestic animals》1991,26(2):66-69

A male specific bovine DNA fragment was used as probe to determine the sex of bovine interphase cells by in situ hybridization. This method also proved useful for determining the sex of bovine embryos.  相似文献   

An outbreak of Akabane virus—induced abnormalities in calves after agistment in an endemic region     

S. JAGOE  PD KIRLAND†  PAW HARPER‡ 《Australian veterinary journal》1993,70(2):56-58

SUMMARY: During 1988, 2 farmers in the Bega district agisted pregnant cattle in the Hunter Valley of New South Wales. On return to the district to calve, 54% of calves from herd 1 and 30% of calves from herd 2 were affected with congenital arthrogryposls or hydranencephaly caused by Akabane virus infection. Field observations and laboratory findings from this outbreak are presented, illustrating the danger of moving immunologlcally naive animals into areas where Akabane virus is endemic.  相似文献   

Otto Martin Radostits 1934 – 2006     

DC Blood  CC Gay  KW Hinchcliff  PD Constable 《Australian veterinary journal》2007,85(6):231-231

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Plasma atrial natriuretic peptide concentration in warmblood horses with heart valve regurgitations     

Heidrun Gehlen PD  Dr Med Vet  Dipl ECEIM  Till Sundermann Dr Med Vet  Karl Rohn Dr Med Vet  Peter Stadler Prof  Dr Med Vet 《Journal of Veterinary Cardiology》2007,9(2):99-101

ObjectivesThis study measured plasma atrial natriuretic peptide (ANP) concentration in horses with heart valve regurgitations (HVR) with and without atrial and ventricular dilatation.BackgroundIn humans and small animals, plasma ANP concentration is increased in heart disease and correlates with the severity of clinical signs and heart enlargement.Animals, materials and methodsTen healthy horses (control) and 36 horses with HVR were evaluated by auscultation, electrocardiography, echocardiography, and determination of plasma ANP.ResultsControl horses demonstrated mean plasma ANP concentration of 21 ± 5.4 pg/mL. Of the 36 horses with HVR, 17 horses possessed normal echocardiographic heart size (group 1), 10 horses had a left atrial dilatation (group 2) and 9 horses had both left atrial and ventricular dilatation (group 3). Mean plasma ANP concentration of groups 1, 2 and 3 was 20.1 ± 5.6 pg/mL, 22.9 ± 11.0 pg/mL and 27.6 ± 17.4 pg/mL, respectively. The plasma ANP concentrations of HVR and control horses were not significantly different. The highest ANP concentrations were observed in horses with atrial and ventricular dilatation. No correlation between left atrial or ventricular size, weight, or sex and the plasma ANP concentration was found.ConclusionsNo significant differences in plasma ANP concentration was observed between groups. Further study, especially in horses with clinical signs of heart failure is needed.  相似文献