Sarah Sgavioli
Department of Animal Morphology and Physiology, Faculty of Agricultural and Veterinary Sciences, Sao Paulo State University, UNESP, S�o Paulo, Brazil
Liliana Longo Borges
Department of Animal Morphology and Physiology, Faculty of Agricultural and Veterinary Sciences, Sao Paulo State University, UNESP, S�o Paulo, Brazil
Vitor Rosa de Almeida
Department of Animal Morphology and Physiology, Faculty of Agricultural and Veterinary Sciences, Sao Paulo State University, UNESP, S�o Paulo, Brazil
Mariana Thimotheo
Department of Animal Morphology and Physiology, Faculty of Agricultural and Veterinary Sciences, Sao Paulo State University, UNESP, S�o Paulo, Brazil
Joao Ademir de Oliveira
Department of Animal Morphology and Physiology, Faculty of Agricultural and Veterinary Sciences, Sao Paulo State University, UNESP, S�o Paulo, Brazil
Isabel Cristina Boleli
Department of Animal Morphology and Physiology, Faculty of Agricultural and Veterinary Sciences, Sao Paulo State University, UNESP, S�o Paulo, Brazil
ABSTRACT
Broiler chicks with high immune defense potential at hatching are of great value to the poultry industry. Heat stress can have immunosuppressive or immune stimulatory effect and Ascorbic Acid (AA) acts as anti-stressor and has important physiological functions in bird immune system development. This study aimed to assess the effect of intra egg injection of AA before incubation on development of the bursa of Fabricius and leukocyte parameters in chicks from eggs incubated at thermoneutral and hot temperatures. Fertile eggs from broiler breeder chickens were used in a 5 × 2 factorial design with 5 treatments (non-injected and thus non-perforated and injected with 0, 2, 4 and 6% AA in 100 μL of water) and 2 incubation temperatures (thermoneutral: 37.5°C and hot: 39.0°C). The total leukocyte count; percentages of thrombocytes, basophils, eosinophils, monocytes and heterophils; weight; and bursal index remained unaffected by incubation temperature and AA dose. Bursal follicle area decreased in chicks from non-injected eggs when incubated at hot temperatures. With intra egg injection of 4 and 6% AA, bursal follicle size increased in eggs incubated at thermoneutral temperature and decreased at hot temperature compared to no AA injection. Cell proliferation in follicles increased by injecting 2% AA, whereas the percentage of lymphocytes increased by injecting 4 and 6% AA. The data show that AA acts as a dose- and temperature-dependent immunomodulator and that 4 and 6% AA doses stimulate egg bursal development and lymphocytosis. These findings suggest that intra egg injection of AA produces chicks with higher potential for immune defense against challenges in the field.
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How to cite this article
Sarah Sgavioli, Liliana Longo Borges, Vitor Rosa de Almeida, Mariana Thimotheo, Joao Ademir de Oliveira and Isabel Cristina Boleli, 2013. Egg Injection of Ascorbic Acid Stimulates Leucocytosis and Cell Proliferation
in the Bursa of Fabricius. International Journal of Poultry Science, 12: 464-472.
DOI: 10.3923/ijps.2013.464.472
URL: https://scialert.net/abstract/?doi=ijps.2013.464.472
DOI: 10.3923/ijps.2013.464.472
URL: https://scialert.net/abstract/?doi=ijps.2013.464.472
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