Made available in DSpace on 2020-12-12T02:21:42Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-01-01; The main strategy to prevent bovine rotavirus group A (RVA) diarrhea in calves is to vaccinate late-term dams aiming to enhance passive immunity transfer of specific immunoglobulins against the virus. This study aimed to evaluate influence of parity in titers of immunoglobulin G (IgG), IgG1 and IgM in s...
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The reproductive efficiency in beef cattle breeding herds is one of the aspects of greater highlight for the financial success of the investment. In the present revision the main parameters used to evaluate the reproductive performance of cows in extensive management will be approached, as well as the more important infectious causes of the reproductive failures that affect the costs of the production.; Na pecu...
The aim of this study was the evaluation of some reproductive rates of a beef cattle herd that were naturally infected by the bovine herpesvirus 1 (BoHV-1), bovine viral diarrhea virus (BVDV) and Leptospira hardjo. In a herd with 1331 females, we randomly selected 208 animals that were distributed in three groups: i) 60 virgin heifers; ii) 60 first suckling cows; iii) 88 cows with two or more sucklings. All gro...
The serological techniques Rapid Conglutination Test (RCT), Indirect ELISA (iELISA) and Indirect Immunofluorescent Assay (IFA), using the competition ELISA (cELISA) as gold test, were comparatively evaluated to detect antibodies against Anaplasma marginale. A total of 453 sera from vaccinated and non vaccinated cattle and, collected from enzootic stability and instability areas were tested. iELISA, IFA and TCR ...
The RT-PCR technique was optimized and evaluated to detect the 5’ untranslated region of bovine viral diarrhea virus (BVDV) from clinical samples that consisted of blood serum and whole blood artificially contaminated with the NADL strain of BVDV. To optimization of technique, the following conditions were evaluated: i) two pairs of primers, 103 / 372 (WEINSTOCK et al., 2001) and 324 / 326 (VILCEK et al., 1994)...
An indirect enzyme-linked immunosorbent assay (ELISA) using non-purified antigen was developed for serological diagnosis of the bovine herpesvirus 1 (BoHV-1) infection. Some blocking substances to prevent nonspecific reactions were evaluated in different concentrations and combinations. The best results were obtained using 5% skim milk powder as blocking solution and the serum/conjugated buffer added with 10% M...