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Year : 2005
Tome : 156
Volume : 5
Pages : 275-280
Title : The effects of laying cycle upon the blood pH, blood gases and other related parameters in geese
Authors : B. KARADEMIR, I. KAYA, O. UCAR and G. KARADEMIR
Summary : This study was carried out to determine the changes in venous blood pH, HCO3- concentration, BE-ecf, BE-b, pCO2, ct-CO2, pO2 and O2sat every 6 h during the laying cycle of the goose. Seven geese (2 year-old, weighing 4.26 kg at average) with a laying cycle of 42 h were used. Diets were formulated to cover their nutrient requirements. After 15 days of adaptation period, blood samples were collected every 6 h during the laying cycle. A first decrease of HCO3- concentrations, base excess in extracellular fluid (BE-ecf) or in blood (BE-b), pCO2 and ct-CO2 was observed at the 6th h, following by a more marked reduction at the 30th h of the laying cycle. Highly significant correlations were obtained between HCO3- concentrations, base excess, pCO2 and ct-CO2 (p < 0.001, correlation coefficients were comprised between 0.946 and 1.000). Although blood pH values remained within normal ranges, close to the inferior limit, multiple regression analyses evidenced links between blood pH, alkaline reserve and CO2 related parameters. By contrast, pO2 and the percentage of O2 saturation (O2sat) fluctuated in an opposite way with the occurrence of 3 spikes at the 6th, 18th and the 30th h, and were highly positively correlated (p < 0.001, r = 0.942). These results indicate that buffering systems (HCO3-, base excess) and functional adaptive responses of lungs and probably kidneys are involved for blood pH regulation during the laying cycle in goose. Therefore, it is suggested that decreased blood HCO3-, BE-ecf, BE-b, pCO2 and ct-CO2 should be corrected in geese, especially at the 30th h of laying cycle for animals health and productivity.
Keywords : Goose - laying cycle - blood pH - blood gas - bicarbonate.
Correspondence : B. KARADEMIR
Adress : Department of Internal Medicine, Faculty of Veterinary Medicine, Kafkas University, Kars-Turkey E-mail: or
Link : pdf

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