Yucatan meteor: the real impact     

Janzen DH 《Science (New York, N.Y.)》1992,258(5085):1071

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Pseudomyrmex nigropilosa: A Parasite of a Mutualism     

Janzen DH 《Science (New York, N.Y.)》1975,188(4191):936-937

Pseudomyrmex nigropilosa is a parasite ofthe ant-acacia mutualism in Central America in that it harvests the resources of swollen-thorn acacias but does not protect the acacias. In the process, it also lowers the rate of occupation by the obligate acacia-ants, species of ants that do protect swollen-thorn acacias. Tenancy ofan acacia by P. nigropilosa must be temporary, since the unoccupied plant is shortly killed by herbivores or competing plants, or is taken over by obligate acacia-ants. As expected of a species of short-lived ant, a P. nigropilosa colony produces reproductives earlier in the life of the colony and maintains fewer grams of workers per gram of brood than does a colony of the long-lived obligate acacia-ants.  相似文献   

Investigation of pregnancy losses in beef cattle herds associated with Neospora sp. infection.   总被引：1，自引：1，他引：0       下载免费PDF全文

B R Hoar  C S Ribble  C C Spitzer  P G Spitzer    E D Janzen 《The Canadian veterinary journal. La revue veterinaire canadienne》1996,37(6):364-366

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Influence of the type of mineral soil on the uptake of dieldrin by wheat seedlings     

J G Saha  J C Karapally  W K Janzen 《Journal of agricultural and food chemistry》1971,19(5):842-845

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Observations on an Outbreak of Infectious Bovine Rhinotracheitis in a Bull Test Station   总被引：1，自引：1，他引：0       下载免费PDF全文

E. D. Janzen  J. N. Smart    H. H. Nicholson 《The Canadian veterinary journal. La revue veterinaire canadienne》1980,21(1):24-27

A clinical outbreak of infectious bovine rhinotracheitis with a morbidity of 11.3% in unvaccinated bulls of a test station is described. The outbreak began explosively in one pen and appeared in others over a period of two weeks. After intranasal vaccination of all bulls, the sporadic occurrence of clinical infectious bovine rhinotracheitis ceased. Although no animals died as a result of infectious bovine rhinotracheitis, the periodic weighing necessary in a bull test station revealed that affected bulls were set back in their average daily rate of gain. While on test, affected Angus bulls never returned to an average daily gain comparable to unaffected bulls of the same breed.  相似文献   

Heimlich chest drain valve used to treat pneumothorax.   总被引：1，自引：0，他引：1       下载免费PDF全文

E A Janzen 《The Canadian veterinary journal. La revue veterinaire canadienne》1973,14(10):257

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Suspected white kidney bean (Phaseolus vulgaris) toxicity in horses and cattle     

Carmalt J  Rosel K  Burns T  Janzen E 《Australian veterinary journal》2003,81(11):674-676

Thirty-four mixed breed horses from two separate farms showed signs of abdominal discomfort, pyrexia and dehydration after being exposed to a new batch of 14% complete horse feed. A new batch of cattle feed from the same manufacturer resulted in dairy cows showing depression, a drop in milk production and diarrhoea. Examination of both diets revealed the presence of white kidney beans (Phaseolus vulgaris). Inclusion of raw beans of this genus in animal feeds is to be avoided.  相似文献   

Thrombocytopenia in weaned beef calves.          下载免费PDF全文

E Janzen  T Clark 《The Canadian veterinary journal. La revue veterinaire canadienne》1995,36(1):45-46

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Predictive value of hypoglycin A and methylencyclopropylacetic acid conjugates in a horse with atypical myopathy in comparison to its cograzing partners          下载免费PDF全文

M. Bochnia  W. Scheidemann  J. Ziegler  J. Sander  S. Vollstedt  M. Glatter  N. Janzen  M. Terhardt  A. Zeyner 《Equine Veterinary Education》2018,30(1):24-28

Hypoglycin A (HGA) was detected in blood and urine of a horse suffering from atypical myopathy (AM; Day 2, serum, 8290 μg/l; urine: Day 1, 574, Day 2, 742 μg/l) and in its cograzing partners with a high variability (46–1570 μg/l serum). Over the period of disease, the level of the toxic metabolites (methylencyclopropylacetic acid [MCPA]‐conjugates) increased in body fluids of the AM horse (MCPA‐carnitine: Day 2, 0.246, Day 3, 0.581 μmol/l serum; MCPA‐carnitine: Day 2, 0.621, Day 3, 0.884 μmol/mmol creatinine in urine) and HGA decreased rapidly (Day 3, 2430 μg/l serum). In cograzing horses MCPA‐conjugates were not detected. HGA in seeds ranged from 268 to 367 μg/g. Although HGA was present in body fluids of healthy cograzing horses, MCPA‐conjugates were not detectable, in contrast to the AM horse. Therefore, increasing concentrations of MCPA‐conjugates are supposed to be linked with the onset of AM and both parameters seem to indicate the clinical stage of disease. However, detection of HGA in body fluids of cograzing horses might be a promising step in preventing the disease.  相似文献   

A review of morbidity and mortality rates and disease occurrence in north american feedlot cattle   总被引：18，自引：13，他引：5       下载免费PDF全文

Kelly AP  Janzen ED 《The Canadian veterinary journal. La revue veterinaire canadienne》1986,27(12):496-500

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