Effects of dietary Original XPC on selected blood variables in layer pullets challenged with Mycoplasma gallisepticum
Autor: | H.O. Pavlidis, E.J. Kim, E. D. Peebles, H.A. Olanrewaju, G. T. Pharr, S.A. Leigh, J.D. Evans, Patrick D. Gerard, K.E.C. Elliott, S. L. Branton |
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Rok vydání: | 2020 |
Předmět: |
Mycoplasma gallisepticum
Bicarbonate Sodium Anion gap chemistry.chemical_element Management and Production Calcium Oxygen Original XPC 03 medical and health sciences chemistry.chemical_compound Animal science Corticosterone medicine Animals Mycoplasma Infections layer pullet Poultry Diseases 030304 developmental biology 0303 health sciences biology 0402 animal and dairy science egg production 04 agricultural and veterinary sciences General Medicine biology.organism_classification medicine.disease immunity 040201 dairy & animal science Diet Respiratory acidosis chemistry Dietary Supplements Female Animal Science and Zoology Fermented Foods Chickens |
Zdroj: | Poultry Science |
ISSN: | 0032-5791 |
Popis: | Effects of dietary Original XPC (XPC) on 17 selected blood variables in commercial layer pullets challenged with the virulent, low-passage R strain of Mycoplasma gallisepticum (RlowMG) were investigated. Hy-Line W-36 pullets sourced from M. gallisepticum–clean layer breeders were fed a basal diet with XPC (1.25 kg/metric ton) or without from hatch until 12 wk of age (woa). At 8 and 10 woa, half of the birds in each dietary treatment were challenged with RlowMG. Blood samples were taken immediately before the initial RlowMG challenge at 8 woa and again at 12 woa (4 wk after challenge). At 8 woa, blood pH was lower and glucose concentration was higher in the preassigned challenge treatment groups. At 12 woa, the concentration of oxygen dissolved in the blood was significantly lower in the RlowMG-challenged group than the unchallenged group of birds regardless of dietary treatment. The RlowMG challenge significantly increased blood carbon dioxide partial pressure, calcium, sodium, anion gap, osmolality, glucose, and corticosterone levels but significantly decreased blood oxygen partial pressure, oxyhemoglobin concentration, concentration of oxygen dissolved in the blood, chloride, and pH levels. Because blood pH and glucose concentration at 8 woa were examined before challenge, their baseline values were biased with respect to challenge treatment before treatment was applied. However, the lack of a significant main effect due to diet at 8 woa for blood pH and glucose concentration, along with the other 15 blood variables, indicate that the baseline data with respect to dietary treatment were unbiased, allowing for real dietary effects to be accurately assessed. In conclusion, layer pullets challenged with RlowMG undergo a stress response associated with changes in various physiological blood variables, and a decrease in pH and increase in carbon dioxide partial pressure, in association with a lack of change in bicarbonate, indicates that the stress response caused by the RlowMG challenge was associated with respiratory acidosis. Nevertheless, feeding XPC did not influence the effects of challenge treatment on these postchallenge physiological blood values. |
Databáze: | OpenAIRE |
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