Maternal and fetal influences on uterine and conceptus development in the cow: II. Blood flow and nutrient flux.

摘要: Objectives of this study were to evaluate maternal and fetal influences on uterine umbilical blood flows nutrient fluxes gravid tissues cows. Brahman cows with or Charolais fetuses used. Indwelling catheters placed into a artery vein, an femoral vein at 220 +/- .4 d after mating. Uterine (liters/min) net uptakes oxygen, glucose, lactate, alpha-amino N, urea ammonia estrone sulfate by the uterus, fetus, uteroplacenta determined 227 .4. in (5.01) (4.66) similar but less (P than .001) (7.14) (9.24), which differed .01). Umbilical (3.78) greater .01) those (2.29) fetuses. Rate placental D2O clearance as well uptake uteroplacental glucose release Gravid oxygen lactate output influenced interaction between cow breed. It is suggested that growth may be limited flow function uteroplacenta, particularly late gestation.