The development of eimerian infections during the first eight months of life in unweaned beef calves in a dry tropical region of Australia   总被引：1，自引：0，他引：1  

R J Parker  G W Jones 《Veterinary parasitology》1987,25(1):1-7

The development of coccidial infections in 21 free-ranging, unweaned beef calves from birth to 8 months was investigated by examining faecal samples for oocysts. Most calves commenced shedding oocysts within a month of birth, and had shed all nine species identified by 3-4 months. Oocysts were shed by three calves as young as 12 and 13 days. The oocysts species shed earliest, and the commonest thereafter, were Eimeria bovis, E. ellipsoidalis and E. zuernii. Although several oocyst counts between 5.0 X 10(3) and 114.0 X 10(3)g-1 of faeces of these potentially pathogenic species were recorded there was no clinical disease. Some calves shed oocysts approximately four times more frequently than others, and individual species counts greater than or equal to 5.0 X 10(3)g-1 were confined to 10 of the calves. Intermittent oocyst shedding continued throughout the study with a similar distribution of oocyst species from all calves.  相似文献   

Stedmans Medical Dictionary - 23rd Edition          下载免费PDF全文

W. Parker 《The Canadian veterinary journal. La revue veterinaire canadienne》1976,17(12):323

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Patterns of preweaning diarrhea in piglets on a central California ranch.          下载免费PDF全文

S Urcelay  D W Hird  E M Huffman  K Parker    T B Farver 《Canadian journal of veterinary research》1984,48(4):394-401

To determine risk factors for development of diarrhea in litters of preweaned piglets, data were analyzed from records of 4,397 litters of swine farrowed on a central California ranch 1978-1982. Sixty-four percent of litters were treated for diarrhea. Statistical analysis by multiple logistic regression showed that litters born to young sows (parity less than or equal to 2) were 1.7 times more likely to develop diarrhea before weaning than were litters born to older sows (parity greater than or equal to 3) and that litters born on one end of farrowing barns were 1.3 times more likely to develop diarrhea than were litters born in the other end. The association of diarrhea with other variables--dam breed, sire, gestation group, gestation length, size of litter, number of mummies, runts or stillbirths per litter, farrowing barn of birth or day of the week farrowed--was weak or nonexistent (P greater than 0.01).  相似文献   

Identification of an agent of epizootic diarrhea of infant mice by immunofluorescent and complement-fixation tests   总被引：5，自引：0，他引：5  

R E Wilsnack  J H Blackwell  J C Parker 《American journal of veterinary research》1969,30(7):1195-1204

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Nephrotoxicity of sodium arsenate in dogs   总被引：1，自引：0，他引：1  

H Tsukamoto  H R Parker  D H Gribble  A Mariassy  S A Peoples 《American journal of veterinary research》1983,44(12):2324-2330

Nephrotoxicity of sodium arsenate was evaluated in dogs to determine the pathophysiologic basis for renal lesions caused by this heavy metal. Examination of biopsy specimens indicated that the low dose of the As salt (0.73 mg/kg of body weight) produced histologic changes consisting of mild degeneration and vacuolation of renal tubular epithelium. Vacuolation involved mainly the ascending thick portion of the nephron. Clinical pathologic changes were not demonstrable at this dosage level according to glomerular filtration rate (creatinine clearance), fractional reabsorption of sodium, potassium, and chloride; plasma osmolar and free water clearance; and urinalysis. The medium dose (7.33 mg/kg) resulted in alterations determined by urinalysis, but did not markedly affect other clinical pathologic measurements. Histopathologic changes were equal to or greater than those seen with the low dose. Tubular necrosis was observed in the cortical portion of the nephron and the ascending thick limb. The high dose (14.66 mg/kg) consistently produced marked changes in all parameters evaluated. Clinical pathologic alterations were compatible with acute tubular necrosis involving all segments of the nephron. Histologically, moderate glomerular sclerosis and severe tubular necrosis were observed. During recovery from the high dose of As, a gradual compensatory healing process was observed that was evident in all clinical pathologic parameters and was confirmed from sequential renal biopsy specimens.  相似文献   

Abomasal fistulas in dairy cows   总被引：1，自引：0，他引：1  

J E Parker  S L Fubini 《The Cornell veterinarian》1987,77(4):303-309

Abomasal fistulas were corrected surgically in 9 adult Holstein cows. Six cows had a history of right paramedian abomasopexy (RPA), and 2 cows had had a percutaneous abomasopexy using the blind-stitch technique (BSA). Fistulas developed from 2 weeks to 12 months after the RPA or BSA. In 1 cow, history was not available beyond 2 years, and no surgery had been performed in that time. All fistulas were in the right paramedian area and were draining blood and/or ingesta from necrotic abomasal tissue (8 cows) or ruminal tissue (1 cow). Surgery was performed immediately in cows with consistent hemorrhage from the fistulated tissue (4 cows). Surgery was delayed to reduce rumen contents if bleeding was absent or considered negligible (4 cows) or to stabilize the patient (1 cow). General anesthesia was used in 7 cows, local anesthesia in 2 cows. Outcome following the fistula resection was successful in the 7 cows discharged from the clinic. The occurrence of abomasal fistulation is probably related to nonabsorbable sutures penetrating the abomasal lumen during the abomasopexy procedure resulting in infection of the incision or body wall.  相似文献   

Molecular pathotyping of two avian influenza viruses isolated during the Victoria 1976 outbreak   总被引：3，自引：0，他引：3  

JB BASHIRUDDIN  AR GOULD  HA WESTBURY 《Australian veterinary journal》1992,69(6):140-142

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Prediction of calving times from plasma progesterone concentration     

B N Parker  J A Foulkes  P C Jones  I Dexter  H Stephens 《The Veterinary record》1988,122(4):88-89

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Distribution of spinal branches of the thoracolumbar segmental arteries in dogs     

A J Parker 《American journal of veterinary research》1973,34(10):1351-1353

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Experimental immunization of calves against Anaplasma marginale infection: observations on the use of living A. centrale and A. marginale     

A.J. Wilson  R. Parker  K.F. Trueman 《Veterinary parasitology》1980,7(4):305-311

Groups of Bos indicus cross calves aged 6 months were immunized with Anaplasma centrale or A. marginale. All animals were challenged with 10¹⁰A. marginale 7 months later. Groups immunized with A. marginale were refractory to challenge, whereas only a portion of the animals vaccinated with A. centrale were immune. Following immunization, animals that had experienced a good primary antibody response as measured by a complement fixation test, a marked reduction in packed cell volume, and a high parasitaemia, resisted a subsequent challenge with A. marginale. Resistance was characterised by a weak secondary antibody response and the absence of A. marginale in blood films  相似文献