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      Evaluation of Incubation Yield, Vaccine Response, and Performance of Broilers Submitted to In-Ovo Vaccination at Different Embryonic Ages

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          Abstract

          ABSTRACT The aim of this study was to evaluate the effects of in-ovo vaccination on different incubation days of broiler embryos derived from young and old breeders on incubation indexes, vaccine response, and broiler performance. A number of 20,160 fertile eggs was distributed according to a completely randomized design in a 4 x 2 factorial arrangement (in-ovo vaccination on 16, 17, 18, or 19 days of incubation, and breeders of 31 or 52 weeks of age), totaling eight treatments with 15 replicates of 168 eggs each. Vaccination procedures and vaccines (strains and doses) were those routinely applied in commercial hatcheries. After hatch, 960 male chicks were housed and distributed according to the same experimental design previously applied in the hatchery. There were hatching losses (p<0.05) when eggs were vaccinated before 18 days of incubation. Greater Marek's disease antibody titers were obtained when the in-ovo vaccination was performed on day 19 of incubation, regardless breeder age. Embryonic age at vaccination did not compromise broiler performance in the field, and the flexibility of embryonic age for in-ovo vaccination can reduces incubation costs.

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          Most cited references23

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          SAS User's Guide. Statistics

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            Comparison of in ovo and post-hatch vaccination with particular reference to infectious bursal disease. A review.

            In ovo vaccination is an alternative approach to post-hatch vaccination of chickens, particularly in broilers. Vaccination at embryonation day 18 helps to 'close the window' of susceptibility i.e. the time between vaccination and early exposure to infectious agents compared with post-hatch vaccination. Attempts on embryonal vaccination as a mode of vaccine delivery were approached from the observation that chickens already develop certain immunologic functions before hatching. The immune system in birds begins to develop early during embryogenesis and various immune reactions have been induced in the late stage chicken embryos. Compared with post-hatch vaccination, in ovo vaccination stimulates both the innate and adaptive immune responses with the advantage that because of the prenatal immunization, in ovo vaccinated chicks have developed an appreciable degree of protection by the time of hatch. Effects of maternal antibodies on vaccines to be used for in ovo vaccination can be prevented by developing vaccines that are insensitive to maternal antibodies. It has been described that vaccination of chicken embryos at embryonation day 18 did not significantly affect the immune competence of hatched chickens. The apparent absence of tolerance in chicks hatched from embryos exposed to an antigen at the late stage of embryonation implies the feasibility of in ovo vaccination. Investigations on in ovo vaccination to produce safe and efficient vaccines are still in progress. Currently a large number of vaccines are under investigation for viral, bacterial and protozoal diseases.
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              Effect of Flock Age and Postemergent Holding in the Hatcher on Broiler Live Performance and Further-Processing Yield

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rbca
                Revista Brasileira de Ciência Avícola
                Rev. Bras. Cienc. Avic.
                Fundação APINCO de Ciência e Tecnologia Avícolas (Campinas, SP, Brazil )
                1516-635X
                1806-9061
                December 2016
                : 18
                : spe2
                : 55-63
                Affiliations
                [2] Palotina Paraná orgnameCvale Company Brazil
                [3] Palotina Paraná orgnameUniversidade Federal do Paraná orgdiv1Department of Veterinary Science Brazil
                [1] Palotina Paraná orgnameUniversidade Federal do Paraná orgdiv1Laboratory of Poultry Experimentation Brazil
                Article
                S1516-635X2016000600055
                10.1590/1806-9061-2015-0216
                407205f1-eff6-4168-850a-04b38fed79ac

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : May 2016
                : February 2015
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 20, Pages: 9
                Product

                SciELO Brazil


                Antibody titers,breeder age,hatching,viral vaccines
                Antibody titers, breeder age, hatching, viral vaccines

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