Fetal and Maternal Plasma Electrolytes, Blood Gases, and pH in Dairy Cows during Late Gestation

Abstract

Sodium, potassium, and chloride were determined in fetal and maternal plasma of six cows between 208 and 269 days of gestation. Blood pH and partial pressures of oxygen and carbon dioxide also were measured in samples collected from the jugular vein of the cow and the caudal aorta and vena cava of the fetus. Concentration of chloride in fetal plasma was generally lower than the corresponding maternal value, and fetal potassium was greater than maternal. Potassium of fetal plasma increased towards term. Sodium concentrations were not significantly different between fetal and maternal plasms. Once fetal and maternal pH and blood gas tensions had stabilized after surgery, there was little change until shortly before delivery. In the last 24 h before calving maternal partial pressure of oxygen was high and fetal blood pH was low.

Plasma estrone sulfate, clinical biochemistry, and milk yield of dairy cows carrying a fetus from a bull or its clone

“…In their article on electrolyte metabolism during late gestation, Wilson et al [26] discussed how the Na uptake by the fetus through the chorioallantoic membranes is a complex process probably regulated through the blood concentrations in the fetus by the actions of fetal corticosteroids and antidiuretic hormone. This consideration, applied to our data, suggests paying more attention, in further trials on this topic, on kidney activity, but is not conclusive in the interpretation of the difference here recorded.…”

Consideraciones clínicas y regulación del equilibrio ácido-base en ganado bovino

“…La sangre venosa es adecuada para realizar interpretaciones válidas de las alteraciones ácido-base de posible origen metabólico (Carlson 1989), mientras que la sangre arterial es apropiada para evaluar los parámetros respiratorios (PaO 2 , PaCO 2 , ó CO 2 total) (Kasari, 1999;Bleul et al 2007). En las últimas horas antes del parto, la presión parcial de oxígeno y el pH sanguíneo fetal se elevan (Wilson et al 1977), mientras que la glucosa sanguínea presenta valores más bajos (Tyler & Ramsey, 1991).…”

Parâmetros hemogasométricos e equilíbrio ácido-básico de cabritos nascidos de partos normais

“…Os neonatos saudáveis sofrem de acidose discreta, sendo que os animais nascidos de partos laboriosos apresentam, invariavelmente, níveis significativamente mais baixos de pH sanguíneo (Wilson et al 1976, Gardiner 1980.…”