旱地钵苗移栽机械化生产的现状及发展趋势   总被引：6，自引：0，他引：6  

王君玲  高玉芝  李成华 《中国农机化》2003,(6):12-14

旱地作物育苗移栽技术工艺因其对气候的补偿作用和使作物生长发育期提前的综合效应．在农业种植业生产上具有重要的经济效益。本文在论述移栽机械化生产必要性的基础上，综合分析了移栽机械化生产的重要意义，讨了国内外早地移栽机械的应用现状及我国发展旱地移栽机械化的发展水平和经验，提出了旱地移栽机械的研究重点和发展趋势。  相似文献   

The minor role of pigs in outbreaks of foot-and-mouth disease of northern Thailand     

P CHAMNANPOOD  PC CLELAND†  FC BALDOCK‡  LJ GLEESONt† § 《Australian veterinary journal》1995,72(4):142-144

SUMMARY: A study was undertaken in northern Thailand to examine the involvement of pigs in outbreaks of foot-and-mouth disease (FMD). Data were collected by surveying selected villages, by serological monitoring of pigs and by investigating outbreaks. Fifty-three of 58 villages (91%) surveyed reported that pigs did not develop FMD during the most recent outbreak. The source of 49/60 (82%) outbreaks was attributed to either recent purchases of infected cattle and buffalo or commingling of cattle and buffalo with stock from an infected neighbouring village. One of 60 villages (1.7%) reported that the source was introduced infected pigs. There was no association between the various hypothesised risk factors relating to the management of pigs and the frequency of FMD outbreaks in the survey. The percentage of seropositive pigs during 3 rounds of serological monitoring conducted at 6-monthly intervals in selected villages was 3.5%, 2.6% and 0%, respectively. No clinically affected pigs were observed in 11 outbreak investigations. It was concluded that pigs did not commonly become infected when there were outbreaks of FMD in village cattle and buffalo in northern Thailand. This was probably due to the pig feeding and housing practices employed by villagers that protected pigs from exposure to virus from infected cattle or buffalo, or their products.  相似文献   

Investigation of a second focus of equine morbillivirus infection in coastal Queensland   总被引：6，自引：0，他引：6  

RJ ROGERS  IC DOUGLAS  FC BALDOCK  RJ GLAVILLE  KT SEPPANEN  LJ GLEESON  PN SELLECK  KJ DUNN 《Australian veterinary journal》1996,74(3):243-244

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Investigation of an outbreak of foot-and-mouth disease in vaccinated dairy cattle in Thailand     

LJ GLEESON  P. CHAMNANPOOD†  S. CHEUNPRASERT‡  N. SRIMASARTITKOL‡  A. TRISASAROM§ 《Australian veterinary journal》1995,72(1):21-24

SUMMARY An outbreak of foot-and-mouth disease that spread between two related vaccinated dairy herds was investigated. Although the cattle were of similar vaccination status, in one herd there was high morbidity, whereas in the other there was considerably lower morbidity. The relationship between the vaccine virus and the outbreak virus was expressed as an r value determined by the two-dimensional neutralisation test. Bovine serum homologous to the vaccine virus indicated a close antigenic relationship between the vaccine virus and the outbreak virus (r = 0.61). The source of the outbreak virus was not determined. The investigation suggested a requirement for close contact between stock for foot-and-mouth disease to spread in a tropical environment, in contrast to the capacity of the disease to spread considerable distances by aerosol transmission in temperate climates.  相似文献   

A national serological survey to verify Australia's freedom from porcine reproductive and respiratory syndrome   总被引：4，自引：0，他引：4  

MG GARNER  LJ GLEESON  PK HOLYOAKE  RM CANNON  WJ DOUGHTY 《Australian veterinary journal》1997,75(8):596-600

Objective To provide serological data to support Australia's claim of freedom from porcine reproductive and respiratory syndrome.
Design A national serological survey was designed to provide 99% confidence of detecting at least one infected pig herd in Australia, assuming that at least 5% of herds would have been exposed to porcine reproductive and respiratory syndrome virus and that at least 25% of the 'finisher' pigs in these herds would have antibodies to the virus.
Procedure A two-stage testing regime was used. All samples were tested with a commercially available enzyme-linked immunosorbent assay. If assay reactions were found, all samples from the herd were to be tested using the indirect immunofluorescence antibody assay.
Results Of the 875 samples from 163 herds from all States in Australia, there was some evidence of reactivity in only four samples from four herds on the enzyme-linked immunosorbent assay. Further testing using the indirect immunofluorescence antibody assay according to the study protocol demonstrated that the reactions were not due to the presence of specific porcine reproductive and respiratory syndrome virus antibodies in the sera.
Conclusion The results of this study support the view that Australian pigs are free of porcine reproductive and respiratory syndrome virus.  相似文献   

Feline lower urinary tract disease: dietary considerations     

LJ FILIPPICH 《Australian veterinary journal》1994,71(10):326-327

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Cutaneous adverse food reactions in cats: retrospective evaluation of 17 cases in a dermatology referral population (2001–2011)     

LJ Vogelnest  KY Cheng 《Australian veterinary journal》2013,91(11):443-451

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Transplacental Transfer of Iron in the Water Buffalo (Bubalus bubalis): Uteroferrin and Erythrophagocytosis     

FTV Pereira  FC Braga  KC Burioli  JR Kfoury Jr  LJ Oliveira  PC Papa  AF Carvalho  CE Ambrósio  FW Bazer  MA Miglino 《Reproduction in domestic animals》2010,45(5):907-914

The objectives of this investigation were to understand transplacental transport of iron by secreted uteroferrin (UF) and haemophagous areas of water buffalo placenta and clarify the role(s) of blood extravasation at the placental‐maternal interface. Placentomes and interplacentomal region of 51 placentae at various stages of gestation were fixed, processed for light and transmission electron microscopy, histochemistry and immunohistochemistry. Haemophagous areas were present in placentomes collected between 4 and 10 months of pregnancy. Perl’s reaction for ferric iron was negative in placentomes, but positive in endometrial glands. Positive staining for UF indicated areas in which it was being taken up by phagocytosis and/or fluid phase pinocytosis in areolae of the interplacentomal mesenchyme, with little staining in endometrial stroma. Imunohistochemistry detected UF in trophectoderm of haemophagous regions of placentomes and in other parts of the foetal villous tree, but the strongest immunostaining was in the epithelial cells and lumen of uterine glands. Ultrastructural analyses indicated that erythrophagocytosis was occurring and that erythrocytes were present inside cells of the chorion that also contained endocytic vesicles and caveolae. Results of this study indicate that both the haemophagous areas of placentomes and the areolae at the interface between chorion and endometrial glands are important sites for iron transfer from mother to foetal‐placental tissues in buffalo throughout pregnancy.  相似文献   

Australian bat lyssavirus-a newly emerged zoonosis?     

LJ GLEESON 《Australian veterinary journal》1997,75(3):188-188

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Leptospira interrogans serovar hardjo is not a major cause of bovine abortion in Victoria     

RJ. CHAPPEL  BD. MILLAR  B. ADLER †  J. HILL ‡  MJ. JEFFERS  RT. JONES  CJ. McCAUGHAN  LJ. MEAD  NW. SKILBECK 《Australian veterinary journal》1989,66(10):330-333

The aim of this study was to determine whether evidence could be obtained of foetal infection with Leptospira interrogans serovar hardjo in aborted foetuses collected from dairy farms. Material from 197 abortions occurring over a wide area of Victoria was collected over 3 years. None of 195 foetal kidney cultures or 7 cultures from membranes was positive for leptospiral organisms. Immunogold silver staining for leptospires was performed on sections of kidneys, lungs or heart from 156 foetuses, with negative results. Evidence of transient leptospiral infection in 11 of 123 foetuses was obtained by foetal heart blood serology. Two isolates of L. interrogans serovar hardjo were obtained from the urine of milking cows. These strains were examined by restriction endonuclease analysis and both were shown to be of the genotype Hardjobovis, as have been all Australian isolates studied so far. It appears that foetal infection with serovar hardjo is not associated with any substantial proportion of bovine abortions in Victoria, in contrast to the situation in Northern Ireland. The apparent absence from Victoria of the pathogenic genotype Hardjoprajitno is a possible explanation.  相似文献