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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
41

Transmission of poultry parasites by birds with special reference to the English or house sparrow and chickens

Hoyle, William Luther. January 1937 (has links)
Call number: LD2668 .T4 1937 H63 / Master of Science
42

The effects of cyclopropenoid fatty acids on the growth, blood lipids, and viral infectivity of White Leghorn chickens

Swanson, Joy Emily 19 February 1982 (has links)
Three studies were designed to evaluate the promoting effect of cyclopropenoid fatty acids (CPFA) on avian myeloblastosis virus (AMV) infection in White Leghorn chickens. In the first study effects on growth parameters, blood serum and erythrocyte lipid composition of White Leghorn chickens were investigated at 100 ppm and 300 ppm dietary CPFA. In comparison to controls, chicks fed dietary CPFA had reduced body weights and food intake. At both levels, CPFA increased the saturated fatty acids and decreased monoenes in blood serum and erythrocyte triacylglycerols and phospholipids. In a second study, the effects of high dietary (300 ppm) CPFA on AMV infectivity were investigated. Chicks were inoculated with 0.1 ml AMV at 7 days of age. A diet containing CPFA was fed before and after inoculation. CPFA/AMV treated chicks showed a marked reduction in body weight gain and food consumption in comparison to controls. CPFA appeared to promote AMV infection along with unexpected violent hemorrhagic manifestations. These hemorrhagic manifestations appeared to cause death before AMV induced myeloblast proliferation in the circulating blood. In comparison to controls, CPFA altered the phospholipid composition of isolated myeloblasts and the cholesterol/phospholipid ratio of isolated myelobasts, myeloblast plasma membrane, and virus particles. Analysis of the acyl group composition of choline and ethanolamine phospholipids from CPFA treated myeloblasts and myeloblast plasma membrane revealed an increase in saturated fatty acid and a decrease in monoenes. In both, CPFA appeared to affect ethanolamine more than choline phospholipids. In contrast, the alterations observed in CPFA treated virus particle choline and ethanolamine fatty acyl chains were reversed from those found in the myeloblast and myeloblast plasma membrane. In addition, ATPase specific activity was altered in relation to the CPFA induced lipid changes in the myeloblast plasma membrane and virus particle. It was shown that as saturation increased enzyme activity increased. As a third investigation, the effects of low dietary (75 ppm and 150 ppm) CPFA on AMV infection was conducted in an attempt to eliminate the hemorrhagic manifestations. A difference that was observed between this investigation and the 300 ppm CPFA/AMV study was less severe hemorrhagic responses. Histological examination of CPFA treated liver and spleen by light microscopy revealed heavy infiltration of mitotic myeloblasts into each tissue. Analysis of the number of virus particle/ml by reverse transcriptase revealed 300 ppm dietary CPFA stimulated the synthesis and release of virus particles. This was in contrast with 150 ppm dietary CPFA which retarded the synthesis and release of virus particles. / Graduation date: 1982
43

Avian intestinal spirochaetosis in British egg laying flocks : molecular diagnosis, epidemiology and economic impact

Abdelrahman, Wael Hosny Abdellatif January 2011 (has links)
No description available.
44

On the aetiology of salpingitis and salpingo-peritonitis of the domestic fowl a statistical and experimental investigation /

Lindgren, Nils Olof. January 1964 (has links)
Thesis (doctoral)--Veterinärhögskolan (Stockholm, Sweden), 1964. / At head of title: From the State Veterinary Medical Institute, Stockholm. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (p. 88-[95]).
45

Avian influenza and Newcastle disease in poultry in Mali : epidemiological investigations and modelling for improved surveillance and control

Molia, Sophie January 2015 (has links)
No description available.
46

Optimising incubation of broiler eggs using external stimuli

Tong, Qin January 2015 (has links)
No description available.
47

Risk-based decision making tools for highly pathogenic avian influenza virus (H5N1) in domestic poultry in Asia : a comparison of spatial-modelling methods

Stevens, Kim Barbra January 2016 (has links)
No description available.
48

Eimeria species as novel antimicrobial vaccine delivery vectors

Pegg, Elaine January 2015 (has links)
No description available.
49

Evaluation of immunity and protection induced in pullets by the V4 oral vaccine against a pneumotropic velogenic Newcastle disease virus (NDV) strain

Magalo, Simone Issaca 04 November 2005 (has links)
Newcastle disease (ND), caused by Newcastle disease virus, is an acute, contagious and pathogenic infection of pet, free living and domestic birds. ND is an epidemic disease and it is responsible for high economic losses due to up to 100 % mortality. The control of ND in the intensive commercial poultry farms is largely dependent on prophylactic immunisation using conventional vaccines. The ND V4 vaccine and its derivative ND V4-HR vaccine were selected originally for use in village chickens, due to their immunogenicity, thermostability, transmissibility and ease of administration. The efficacy of V4 and V4HR vaccines have been established in many Asian and African countries in their ability to challenge a wide range of recognised and local velogenic NDV. Therefore, ND V4 was tested for efficacy against B1172 challenge NDV isolated in south Africa in 1993. Twenty-eight one day-old replacement pullets were vaccinated by eye-drop route at 21 and 49 days old. Chickens vaccinated by eye-drop route were left to mingle with the unvaccinated in-contact chickens. At 63 days all chickens including the unvaccinated control group were individually challenged with B1172 NDV. Serological monitoring of NDV antibody response was done using HI and ELISA tests. The ND V4 vaccine induced full protection against B1172 NDV in chickens vaccinated by eye-drop vaccination and in 55 % of chickens vaccinated by the in-contact method. No association was seen between NDV antibody titer at pre-challenge and the ability to withstand B1172 challenge NDV. A fair to good agreement was seen between the HI and ELISA test in monitoring NDV antibody response during the experiment. Although, the ELISA showed a higher sensitivity and specificity than the HI test, further studies are required using this method of comparison. / Dissertation (MMed Vet (Poultry diseases))--University of Pretoria, 2002. / Production Animal Studies / unrestricted
50

Live poultry exposure and avian influenza (H5N1) risk perception in Guangzhou, 2006-2007

Liao, Qiuyan., 廖秋燕. January 2008 (has links)
published_or_final_version / Community Medicine / Master / Master of Philosophy

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