14 EVALUATION OF BACTERIAL CONTAMINATION AFTER UNCOMPLICATED EQUINE CASTRATIONS.     

MJ  Schoonover  HD Moll  CL Crowson  HW Jann 《Veterinary surgery : VS》2003,32(6):601-602

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Physiological, morphological and allocational plasticity in understory deciduous trees: importance of plant size and light availability     

Delagrange S  Messier C  Lechowicz MJ  Dizengremel P 《Tree physiology》2004,24(7):775-784

In a 4-year study, we investigated changes in leaf physiology, crown morphology and whole-tree biomass allocation in seedlings and saplings of shade-tolerant sugar maple (Acer saccharum Marsh.) and intermediate shade-tolerant yellow birch (Betula alleghaniensis Britt.) growing in natural understory light (0.5 to 35% of full sunlight) or in understory light reduced by 50% with shade nets to simulate the effect of gap closure. Leaf physiological parameters were mainly influenced by the light gradient, whereas crown morphological and whole-tree allocational parameters were mainly influenced by tree size. No single physiological, morphological or allocational trait was identified that could explain the difference in shade tolerance between the species. Yellow birch had higher growth rates, biomass allocation to branches and leaf physiological plasticity and lower crown morphological plasticity in unmodified understory light than sugar maple. Sugar maple did not display significant physiological plasticity, but showed variation with tree size in both crown morphology and whole-tree biomass allocation. When sugar maple was small, a greater proportion of whole-tree biomass was allocated to roots. However, physiological differences between the species decreased with decreasing light and most morphological and allocational differences tended to disappear with increasing tree size, suggesting that many species differences in shade-tolerance are expressed mainly during the seedling stage. Understory trees of both species survived for 4 years under shade nets, possibly because of higher plasticity when small and the use of stored reserves when taller.  相似文献   

Hypovitaminosis A in pigs     

MJ CARRIGAN  JRW GLASTONBURY  JV EVERS 《Australian veterinary journal》1988,65(5):158-160

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Seasonality of sarcoptic mange in pigs in South Australia     

PR DAVIES  MJ MOORE  AM POINTON 《Australian veterinary journal》1991,68(12):390-392

Retrospective analysis of records, from July 1987 to June 1991, of 1140 inspections of slaughtered pigs from 154 swine herds in the Pig Health Monitoring Scheme of South Australia was conducted to evaluate patterns of variation in the prevalence and severity of skin lesions typical of sarcoptic mange. An increase in the severity of sarcoptic mange in winter and spring was observed. There was a substantial reduction in the severity of mange over the period of monitoring. These observations support the role of monitoring at slaughter in the management of endemic disease. They provide some basis for refining control programs for mange to improve cost-effectiveness.  相似文献   

A cross-sectional study to show Eperythrozoon ovis infection is prevalent in Western Australian sheep farms   总被引：4，自引：0，他引：4  

MJ KABAY  RB RICHARDS  TE ELLIS 《Australian veterinary journal》1991,68(5):170-173

A serological survey and risk factor study was conducted to estimate the prevalence of Eperythrozoon ovis infection in Western Australian weaner sheep, the prevalence of farms with infected sheep, and to identify factors affecting initiation and maintenance of infection on the farm. The study was conducted on 91 farms, purposively chosen from 41 randomly selected regional shires stratified by sheep number and rainfall zones. Twenty sheep were selected systematically from a mixed-sex flock on each farm and tested for serum antibody to E ovis using an enzyme-linked immunosorbent assay. Information on putative risk factors was collected using an interview questionnaire. Antibody to E ovis was detected in 4.5% of sheep on 47% of the farms sampled. The prevalence of E ovis infection in sheep was estimated at the 95% confidence level to be between 3.6 and 5.5%, and the prevalence of farms with infected sheep was estimated to be between 37.5 and 56.5%. Most farms with serological evidence of infection occurred in the Great Southern agricultural region (79.5%), south-east of Perth through to Albany (latitude 32 to 34 degrees S, longitude 116 to 120 degrees E), and in the Northern region (12.8%) surrounding Geraldton (latitude 29 degrees S, longitude 114 degrees E). There were significantly more farms (P less than 0.05) with evidence of infection in the Great Southern region compared to the Central region between Geraldton and Perth, and on farms in the region south compared to north of latitude 32 degrees S. None of the putative risk factors examined in the questionnaire were associated with serological evidence of infection on the farm.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

Reply     

MJ STUDDERT 《Australian veterinary journal》1994,71(11):387-388

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CD3 SmIglymphoblastic leukaemia in an outbred domestic guinea pig     

MJ DAY  EK BRIGGS 《Australian veterinary journal》1997,75(3):217-218

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Caseous lymphadenitis on Flinders Island: prevalence and management surveys     

MJ MIDDLETON  VM EPSTEIN  GG GREGORY 《Australian veterinary journal》1991,68(9):311-312

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Inherited progressive spinal myelinopathy in Murray Grey cattle   总被引：1，自引：0，他引：1  

JR EDWARDS  RB RICHARDS†  MJ CARRICK‡ 《Australian veterinary journal》1988,65(4):108-109

In a breeding experiment conducted to determine the mode of inheritance of progressive spinal myelinopathy, semen from a Murray Grey bull which had previously sired affected calves was used to inseminate 120 cows. Female progeny were then inseminated with semen from the same bull. Of the 51 calves born, six (11.8%) had spinal cord lesions consistent with progressive spinal myelinopathy. From analysis of pedigrees and the results of the breeding experiment it was concluded that the condition was inherited as an autosomal recessive condition in Murray Grey cattle.  相似文献   

Interacting effects of nutrients,pH - Al and elevated CO2 on the growth of red spruce (Picea rubens Sarg.) seedlings     

B. Shipley  M. Lechowicz  S. Dumont  W. H. Hendershot 《Water, air, and soil pollution》1992,64(3-4):585-600

A 4 mo growth chamber experiment was conducted to evaluate the presence and importance of interactions between nutrient supply, atmospheric CO₂ concentration, and four different combinations of pH — Al concentration on the growth, vitality, and tissue element concentrations of 1-yr-old red spruce seedlings. Solution chemistry was chosen to simulate soil conditions at a red spruce die-back site at Roundtop Mountain (Quebec) that has high acid loadings. CO₂ levels were chosen to simulate ambient levels and those expected in the next century. All three experimental factors affected growth and all factors except CO₂ affected the visual symptoms of die-back. There was an important interaction between nutrient levels and the different pH — Al combinations, indicating that the response of red spruce to various pH and Al concentrations changes with soil fertility. The positive growth response to enriched CO₂ was not sufficient to offset the negative effects of the acid rain induced stresses. A principal component analysis showed that multivariate functions of foliar element concentrations could clearly distinguish plants from different experimental regimes.  相似文献