FACTORS CONTRIBUTING TO POSTWEANING DIARRHOEA IN A LARGE INTENSIVE PIGGERY   总被引：4，自引：0，他引：4  

S. Tzipori  D. Chandler  M. Smith  T. Makin  D. Hennessy 《Australian veterinary journal》1980,56(6):274-278

Some aspects of postweaning diarrhoea (PWD) in a piggery during the first week after early weaning were investigated. A haemolytic enterotoxigenic strain of E. coli (0149: K88: H10) was regularly recovered from piglets with PWD while rotavirus was demonstrated on a number of occasions. Prior to weaning piglets were either free of, or shed very few, haemolytic E. coli in their faeces. However, all piglets were excreting haemolytic E. coli between 5 and 7 days after weaning. The role of rotavirus in PWD was unclear. There appeared to be a direct relationship between serum antibodies to rotavirus in the sow at farrowing and those of the piglets soon after birth. The decline of maternal neutralising antibody to rotavirus coincided with the immediate postweaning period (3 to 5 weeks after birth). This was followed by an increase in antibody levels, 5 to 8 weeks after birth. There was no significant difference in the growth rate between affected and unaffected piglets over a period of 120 days. Medication of water during the first week after weaning had no significant effect on the incidence of PWD in the herd. A change in both the weaner diet and the weaning procedure reduced piglet mortality associated with PWD by more than half.  相似文献   

Decreased potassium fertilization is associated with increased pathogen growth and disease severity caused by <Emphasis Type="Italic">Acidovorax citrulli</Emphasis> in melon foliage     

Naama Zimerman-Lax  Dafna Tamir-Ariel  Moshe Shenker  Saul Burdman 《Journal of General Plant Pathology》2018,84(1):27-34

The gram-negative bacterium Acidovorax citrulli causes bacterial fruit blotch (BFB) disease of cucurbits, which represents a serious threat to melon and watermelon production worldwide. To date, there are no efficient means to manage the disease, and reliable resistance sources for cucurbit germplasm are lacking. Mineral nutrition markedly affects plant diseases. Recently, we reported that disease severity on melon foliage and A. citrulli growth in the leaf tissue were significantly influenced by the form of nitrogen supply. In the present study, we investigated the influence of potassium nutrition on BFB severity and A. citrulli establishment in the foliage of melon plants. Fertilization with relatively low concentrations of potassium increased these variables compared with higher potassium concentrations. Since establishment of A. citrulli during the growing season is assumed to increase the incidence of fruit infection, the fact that mineral nutrition influences BFB incidence in the plant foliage is of particular importance.  相似文献   

Intestinal changes associated with rotavirus and enterotoxigenic Escherichia coli infection in calves   总被引：1，自引：0，他引：1  

S Tzipori  M Smith  C Halpin  T Makin  F Krautil 《Veterinary microbiology》1983,8(1):35-43

Newborn calves inoculated with rotavirus, enterotoxigenic Escherichia coli (ETEC) serotype 020:K' x 106':K99:HNM, either alone or in combination, became depressed, anorectic, diarrhoeic and dehydrated. ETEC did not adhere to the intestine although there was extensive proliferation in the lumen. Only slight mucosal changes were induced by ETEC and the activity of membrane bound lactase remained normal. More severe mucosal damage and a decrease in lactase activity were found in newborn calves inoculated with either rotavirus or rotavirus and ETEC in combination. The most severe clinical illness was found in calves inoculated with both rotavirus and ETEC. Calves inoculated at 1 week of age with either rotavirus or ETEC remained clinically normal. Rotavirus infection produced slight mucosal changes and a reduction of lactase activity. In contrast, colostrum-fed or suckling calves up to 2 weeks old inoculated with both rotavirus and ETEC became clinically affected, showed severe mucosal damage and decreased lactase activity. There was no bacterial adhesion to the intestinal mucosa as observed by immunofluorescent labelling and light microscopy.  相似文献   

Plaque assay and characteristics of strains of bovine ephemeral fever virus in Vero cells.     

S Tzipori 《The British veterinary journal》1975,131(6):720-726

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Growth of bovine cell monolayer cultures from tissue explants     

S Tzipori 《American journal of veterinary research》1974,35(3):455-456

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DIARRHOEA IN PIGLETS INOCULATED WITH ROTAVIRUS     

S Tzipori  I H Williams 《Australian veterinary journal》1978,54(4):188-192

A rotavirus isolated from a field outbreak of diarrhoea in artificially reared piglets was purified, filtered and administered orally to gnotobiotic and conventional piglets. Four successive passages of the virus in gnotobiotic piglets produced severe diarrhoea within 20 to 24 hours of administration. The diarrhoea lasted several days causing dehydration, emaciation, loss of body weight and some deaths. Virus was demonstrated in the faeces of the infected piglets by electron microscopy. Conventionally reared piglets developed little or no diarrhoea when given virus, whereas artificially reared piglets developed moderate to severe diarrhoea which lasted from 3 to 8 days with some deaths. No clinical disease was obvious in surviving piglets following challenge with the virus 10 or 17 days after initial infections.  相似文献   

Seismic images of crust and upper mantle beneath Tibet: evidence for Eurasian plate subduction   总被引：19，自引：0，他引：19  

Kind R  Yuan X  Saul J  Nelson D  Sobolev SV  Mechie J  Zhao W  Kosarev G  Ni J  Achauer U  Jiang M 《Science (New York, N.Y.)》2002,298(5596):1219-1221

Seismic data from central Tibet have been combined to image the subsurface structure and understand the evolution of the collision of India and Eurasia. The 410- and 660-kilometer mantle discontinuities are sharply defined, implying a lack of a subducting slab beneath the plateau. The discontinuities appear slightly deeper beneath northern Tibet, implying that the average temperature of the mantle above the transition zone is about 300 degrees C hotter in the north than in the south. There is a prominent south-dipping converter in the uppermost mantle beneath northern Tibet that might represent the top of the Eurasian mantle lithosphere underthrusting the northern margin of the plateau.  相似文献   

Economics. The promise of prediction markets   总被引：1，自引：0，他引：1  

Arrow KJ  Forsythe R  Gorham M  Hahn R  Hanson R  Ledyard JO  Levmore S  Litan R  Milgrom P  Nelson FD  Neumann GR  Ottaviani M  Schelling TC  Shiller RJ  Smith VL  Snowberg E  Sunstein CR  Tetlock PC  Tetlock PE  Varian HR  Wolfers J  Zitzewitz E 《Science (New York, N.Y.)》2008,320(5878):877-878

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A Phaseolus vulgaris EF-hand calcium-binding domain is induced early in the defense response against Colletotrichum lindemuthianum and by abiotic stress: Sequences shared between interacting partners     

Alejandro Alvarado-Gutirrez  Melina Del Real-Monroy  Raul Rodríguez-Guerra  Leticia Almanza-Snchez  Edmundo Lozoya-Gloria  Saul Fraire-Velzquez 《Physiological and Molecular Plant Pathology》2008,72(4-6):111-121

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Effects of nitrogen nutrition on disease development caused by Acidovorax citrulli on melon foliage     

Naama Zimerman-Lax  Moshe Shenker  Dafna Tamir-Ariel  Rafael Perl-Treves  Saul Burdman 《European journal of plant pathology / European Foundation for Plant Pathology》2016,145(1):125-137

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