Carcinogen in rock fern (Chielanthes sieberi) from New Zealand and Australia     

BL SMITH  PP EMBLING  DR LAUREN  MP AGNEW  AD ROSS  PL GREENTREE 《Australian veterinary journal》1989,66(7):230-231

  相似文献   

Reduction and recovery of N-acetylglucosamine-1-phosphate transferase activity in the liver of sheep and rats after a single subcutaneous dose of tunicamycin     

PL STEWART  C MAY CSIRO  MV JAGO 《Australian veterinary journal》1998,76(4):287-288

  相似文献   

Impact of vegetation management on macroinvertebrates in chalk streams     

P. D. Armitage  J. H. Blackburn  J. M. Winder  J. F. Wright 《水产资源保护:海洋与淡水生态系统》1994,4(2):95-104

Dense growths of macrophytes are a characteristic feature of chalk streams which may cause problems both to farmers and anglers. Weed is frequently cut to reduce flooding of surrounding land and provide open water for anglers. The objective of this study was to examine short-term responses of macroinvertebrate faunal assemblages in main flow and marginal samples to both weed-cutting and the application of herbicide and to compare these with untreated controls. No statistically significant effect could be demonstrated on such faunal parameters as biotic score, richness and abundance and a multivariate analysis of all available data showed that the weed-cut and herbicide treated sites could not be distinguished from the control sites III and V on the basis of their fauna. It is suggested that for conservation purposes small-scale management with ‘recovery strips’ separating the treated reaches can achieve the desired objectives of avoiding flooding and providing open water for anglers with minimal effects on the river biota.  相似文献   

Comparison of bronchoalveolar lavage and respiratory secretion cytology in horses with clinically diagnosed chronic pulmonary disease     

N C Winder  M Hermann  G Grünig  C Hulliger  R Von Fellenberg 《Schweizer Archiv für Tierheilkunde》1990,132(9):505-510

Thirty-nine horses and 3 ponies underwent a thorough respiratory examination and were grouped as follows: healthy (4 horses and 1 pony); mild chronic pulmonary disease (CPD 11 horses); moderate CPD (16 horses and 1 pony); and severe CPD (8 horses and 1 pony). Bronchoalveolar lavage (BAL) fluid collected from all animals and respiratory secretions (RS) obtained from 39 of these animals were evaluated cytologically and the results were compared. It was concluded that cytological examination of either BAL fluid or RS was useful in diagnosing various equine pulmonary diseases. The only advantage that BAL offered over RS sampling was in cases in which there was no RS available in the trachea. In addition, the severity of the CPD did not always correlate with either RS or BAL cytology.  相似文献   

Genetic analysis of absolute growth measurements, relative growth rate and restricted selection indices in red Angus cattle     

J A Winder  J S Brinks  R M Bourdon  B L Golden 《Journal of animal science》1990,68(2):330-336

Performance records on 41,184 Red Angus cattle were analyzed and estimates of parameters calculated for absolute growth rate, relative growth rate and restricted selection indices. Heritability estimates for birth weight, 205-d weight, 365-d weight and postweaning gain were .46 +/- .02, .39 +/- .02, .40 +/- .02 and .36 +/- .02, respectively. Heritability estimates for preweaning, postweaning and postnatal relative growth rates were identical (.33 +/- .02). Heritability estimates for restricted selection indices were .31 +/- .02, .33 +/- .02 and .31 +/- .02 for weaning index, yearling index and postweaning index, respectively. The genetic correlation between preweaning and postweaning absolute growth rate was .15. The genetic correlation between consecutive measurements of relative growth rate (RGR) was -.33. Genetic correlations of birth weight with preweaning RGR and postnatal RGR were -.68 and -.71, respectively. Correlations among measures of relative growth rate using simulated data were similar to correlations of actual data, indicating that these relationships are the result of numerator/denominator relationships and not biological causes. The genetic correlation between weaning and postweaning indices was near zero. Small genetic coefficients of variation for preweaning and postnatal relative growth rates indicate further problems with the expression of growth in this manner. Restricted selection indices exhibited much larger genetic coefficients of variation than measurements of RGR. Genetic standard deviations were 7.8%, 7.2% and 13.7% of the means for weaning, yearling and postweaning indices, respectively.  相似文献   

BSE: lessons for Australia     

PL YOUNG 《Australian veterinary journal》1996,74(2):126-127

  相似文献   

Modelling the introduction and transmission of Campylobacter in a North American chicken flock     

Mikayla Plishka  Jan M. Sargeant  Charlotte Winder  Amy L. Greer 《Zoonoses and public health》2022,69(1):23-32

Campylobacter is the second leading cause of foodborne illness in the United States. Although many food production animals carry Campylobacter as commensal bacteria, consumption of poultry is the main source of human infection. Previous research suggests that the biology of Campylobacter results in complete flock colonization within days. However, a recent systematic review found that the on-farm prevalence of Campylobacter varies widely, with some flocks reporting low prevalence. We hypothesized that the low prevalence of Campylobacter in some flocks may be driven by a delayed introduction of the pathogen. The objectives of this study were to (a) develop a deterministic compartmental model that represents the biology of Campylobacter, (b) identify the parameter values that best represent the natural history of the pathogen in poultry flocks and (c) examine the possibility that a delayed introduction of the pathogen is sufficient to replicate the observed low prevalence examples documented in the literature. A deterministic compartmental model was developed to examine the dynamics of Campylobacter in chicken flocks over a 56-day time period prior to movement to the abattoir. The model outcome of interest was the final population prevalence of Campylobacter at day 56. The resulting model that incorporated a high transmission rate (β = 1.04) was able to reproduce the wide range of prevalence estimates observed in the literature when pathogen introduction time is varied. Overall, we established that the on-farm transmission rate of Campylobacter in chickens is likely high and can result in complete colonization of a flock when introduced early. However, delaying the time at which the pathogen enters the flock can reduce the prevalence observed at 56 days. These results highlight the importance of enforcing strict biosecurity measures to prevent or delay the introduction of the bacteria to a flock.  相似文献   

Immunofluorescent evaluation of the lower respiratory tract of healthy horses and of horses with chronic bronchiolitis     

N C Winder  R von Fellenberg 《American journal of veterinary research》1986,47(6):1271-1274

Pulmonary parenchymal tissues from 6 healthy horses and from 9 horses with chronic bronchiolitis were evaluated by use of an indirect immunofluorescent technique. In horses of both groups, the diffuse interstitial immunofluorescence was most intense for immunoglobulin (Ig)G, moderate for IgA, and minimal for IgM. Intensity of fluorescence was increased markedly in diseased lungs exposed to anti-IgA and anti-IgG. Around small bronchi and large bronchioles of healthy horses, IgA-containing cells generally were more numerous than were IgG-Fc fragment (Fc)-containing cells; in small bronchioles, however, IgA-containing cells and IgG (Fc)-containing cells were identified with approximately equal frequency. Immunoglobulin-containing cell types usually were located in the lamina propria and submucosa of airways, with occasional Ig-containing cells seen interepithelially and intraluminally; IgG (T)- and IgM-containing plasma cells were observed infrequently in the same regions. The number of Ig-containing cells became fewer as the diameter of the airway decreased; therefore, at the level of the terminal bronchiole, Ig-containing cells only were observed occasionally. This pattern of Ig-containing cell distribution was similar in horses with chronic bronchiolitis; however, horses with chronic bronchiolitis had more IgA-containing cells forming perivascular and peribronchiolar cuffs than did healthy horses. The number of IgG (Fc)-containing lymphocytes and non-Ig-stainable lymphocytes also were higher in horses with chronic bronchiolitis than in healthy horses, but the number did not approach the magnitude of that observed for IgA-containing cells. One horse had deposits of complement C3 and IgG (Fc) within alveolar septa.  相似文献   

Distribution of histological lesions in the equine endometrium     

R O Waelchli  N C Winder 《The Veterinary record》1989,124(11):271-273

The distribution of histopathological lesions in the equine endometrium was examined to investigate the representativeness of a single biopsy specimen in terms of the whole endometrium. Five sections from each of 110 uteri obtained from slaughtered mares were evaluated microscopically and classified according to a four-category grading system used for endometrial biopsies. Depending on the extent of agreement between the categories of the homologous sections, the uteri were considered to show either good agreement (81 uteri; 73.6 per cent), moderate agreement (26 uteri; 23.6 per cent) or poor agreement (three uteri; 2.7 per cent). All the homologous sections of the group showing moderate agreement were within two adjacent categories. Disagreements were more often due to variations in the distribution of fibrotic lesions than to variations in the degree of chronic infiltrative lesions. There was no seasonal effect on the apparent degree or distribution of lesions. In most cases the examination of a single biopsy, when combined with a thorough clinical examination, should provide adequate information about the condition of a mare's endometrium.  相似文献   

Immunohistochemical localisation of alpha-1-protease inhibitor in the horse     

N C Winder  A Pellegrini  R von Fellenberg 《Research in veterinary science》1989,46(3):354-357

Using a peroxidase anti-peroxidase technique alpha-1-protease inhibitor (alpha-1-PI) was identified in normal equine hepatocytes in formalin-fixed liver sections, and in airway secretions and macrophages in formalin-fixed lung sections of horses with chronic small airway disease and chronic bronchointerstitial pneumonia. In addition, it was identified occasionally in macrophages in bronchoalveolar lavage samples from clinically healthy horses and from horses with chronic small airway disease. Equine peripheral blood leucocytes and formalin-fixed lung sections with normal histology were negative for alpha-1-PI.  相似文献