Effects of single and combined Mycoplasma gallisepticum vaccinations on blood electrolytes and acid-base balance in commercial egg-laying hens.

Efeitos de vacinações isoladas e combinadas contra *Mycoplasma gallisepticum* sobre os eletrólitos sanguíneos e o equilíbrio ácido-base em galinhas poedeiras comerciais.

Clicks: 475
ID: 32284
2011
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Abstract
A previous study from our laboratory on F-strain Mycoplasma gallisepticum-inoculated layers showed a significant increase in arterial partial pressure of oxygen (pO(2)), which is generally associated with an oxygen-dependent improvement in tissue oxygenation. The aim of this study was to determine whether a killed (bacterin) and live TS-11-strain M. gallisepticum (TS-11-MG) vaccine treatment combination could further enhance the arterial pO(2) levels in layer chickens. The experiment was conducted in 2 trials and arranged in a completely randomized experimental design with 4 treatments. The treatments consisted of a control M. gallisepticum, bacterin, TS-11-MG, and bacterin + TS-11-MG combined, with all treatments receiving the R low strain of MG at 30 wk of age (WOA). In each of the 2 trials, 160 one-day-old MG-free pullets were raised to 10 WOA and were transported to a poultry disease isolation facility. Sixteen isolation units were divided into 4 treatment groups, and each of the 4 treatment groups had 4 replication units, with 10 birds/unit (40 birds/treatment). Venous blood samples were collected at the termination of the study at 56 WOA. The TS-11-MG-vaccinated chickens had a higher (P ≤ 0.05) blood pO(2) and a lower (P ≤ 0.05) partial pressure of CO(2) when compared with the control and combined MG-vaccinated groups. However, no significant blood pO(2) differences were observed between the bacterin and TS-11-MG treatment groups. Hematocrit and blood concentrations of hemoglobin were not statistically different among treatments, but were numerically higher in the TS-11-MG treatment group. There was a significant (P ≤ 0.05) treatment effect on blood concentrations of Na(+), Ca(2+), and anion, but no significant effect on glucose, cholesterol, triglyceride, or osmolality. These data suggest that the inoculation of layers with TS-11-MG was more effective in elevating pO(2) than was inoculation with TS-11-MG + bacterin combined.
Um estudo prévio de nosso laboratório com poedeiras inoculadas com a cepa F de *Mycoplasma gallisepticum* demonstrou um aumento significativo na pressão parcial arterial de oxigênio (pO(2)), o que é geralmente associado a uma melhora dependente de oxigênio na oxigenação tecidual. O objetivo deste estudo foi determinar se uma combinação de tratamentos vacinais inativado (bacterina) e vivo da cepa TS-11 de *M. gallisepticum* (TS-11-MG) poderia elevar ainda mais os níveis arteriais de pO(2) em galinhas poedeiras. O experimento foi conduzido em dois ensaios e estruturado em um delineamento experimental inteiramente casualizado com quatro tratamentos. Os tratamentos consistiram em um controle de *M. gallisepticum*, bacterina, TS-11-MG e bacterina + TS-11-MG combinados, com todos os tratamentos recebendo a cepa R-low de MG às 30 semanas de idade (WOA). Em cada um dos dois ensaios, 160 frangas de um dia de idade, livres de MG, foram criadas até as 10 WOA e transportadas para uma unidade de isolamento de doenças avícolas. Dezesseis unidades de isolamento foram divididas em quatro grupos de tratamento, e cada um dos quatro grupos de tratamento contou com quatro repetições, com 10 aves/unidade (40 aves/tratamento). Amostras de sangue venoso foram coletadas ao término do estudo, às 56 WOA. As aves vacinadas com TS-11-MG apresentaram maior (P ≤ 0,05) pO(2) sanguínea e menor (P ≤ 0,05) pressão parcial de CO(2) quando comparadas aos grupos controle e vacinado com a combinação de MG. No entanto, não foram observadas diferenças significativas na pO(2) sanguínea entre os grupos de tratamento com bacterina e TS-11-MG. O hematócrito e as concentrações sanguíneas de hemoglobina não diferiram estatisticamente entre os tratamentos, mas foram numericamente superiores no grupo de tratamento TS-11-MG. Houve efeito significativo (P ≤ 0,05) do tratamento sobre as concentrações sanguíneas de Na(+), Ca(2+) e ânions, mas nenhum efeito significativo sobre glicose, colesterol, triglicerídeos ou osmolalidade. Esses dados sugerem que a inoculação de poedeiras com TS-11-MG foi mais eficaz no aumento da pO(2) do que a inoculação combinada com TS-11-MG + bacterina.
Reference Key
olanrewaju2011effectspoultry Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Olanrewaju, H A;Collier, S D;Branton, S L;
Journal Poultry science
Year 2011
DOI
10.3382/ps.2010-01006
URL
Keywords Keywords not found

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