biochemical evaluation of amniotic fluid during different stages of gestation in the goat

to study changes in concentrations of some biochemical factors of amniotic fluid, 115 normal goat uteri at different stages of pregnancy were collected from slaughterhouse. after expelling of each fetus accompanied by fetal membranes, 10 ml amniotic fluid was taken from amniotic sac for biochemical analysis. then approximate ages of fetuses were calculated by using age estimation formula. at five stages of five months of pregnancy, the following results were obtained, respectively: sodium concentrations were 123.3, 125, 115.9, 122 and 120.8 mmol/l; potassium, 6.2, 5.2, 5.8, 4.9 and 5.6 mmol/l; chloride, 101.4, 115.1, 117.3, 106.6 and 94.9 mmol/l; glucose, 7.1, 11.5, 8.8, 4.9 and 3.6 mg/dl; urea, 43.7, 69.3, 84.8, 117 and 91.7 mg/dl; uric acid, 0.4, 0.1, 0.1, 0.3 and 0.7 mg/dl; creatinine, 1.5, 0.6, 0.6, 5 and 5.9 mg/dl and total protein with the highest value of 54.2 mg/dl at the first month of pregnancy and the lowest value of 26.6 mg/dl at the second month.