Blood Flow and Nutrient Uptake of the Bovine Uterus and Fetus

Blood flow steroid secretion and nutrient uptake of the gravid bovine uterus.

A study was conducted with mature Hereford cows to quantitate blood flow, steroid secretion and nutrient uptake of the gravid uterus and fetus. Surgery was performed on cows at 163 to 166 (stage 1, N = 5) and 173 to 176 (stage 2, N = 11) d postmating. The uterus of each cow was exposed by midventral laparotomy and catheters were placed in a major branch of an artery (UA) and vein (UV) of the gr...

Effects of Chronic Environmental Heat Stress on Blood Flow and Nutrient Uptake by the Uterus and Fetus of the Pregnant Cow

Uterine blood flow and nutrient uptake during late gestation in ewes with different number of fetuses.

Twenty-three unanesthetized ewes with, single, twin or triplet lambs and with indwelling femoral artery and utero-ovarian vein catheters were studied at 105 or 121 days of gestation, Glucose and a-amino acid nitrogen (a-NH 2-N) uptake by the gravid uterus was determined from arterial-venous (A-V) differences and utero-ovarian blood flow measurements. Uterine blood flow was determined by p-amino...

Uterine and umbilical blood flows and net nutrient uptake by fetuses and uteroplacental tissues of cows gravid with either single or twin fetuses.

To evaluate the influence of cow breed and number of fetuses on uterine and umbilical blood flows and nutrient fluxes or uterine tissues from gravid cows, surgery was performed on Charolais or Hereford cows with single or twin fetuses at 177 +/- .2 d (mean +/- SEM) after mating. Indwelling catheters were placed in a fetal femoral artery and vein, in an umbilical vein of each fetus, and in a ute...

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

Objectives of this study were to evaluate maternal and fetal influences on uterine and umbilical blood flows and nutrient fluxes of gravid uterine tissues of cows. Brahman cows with Brahman or Charolais fetuses and Charolais cows with Brahman or Charolais fetuses were used. Indwelling catheters were placed into a uterine artery and vein, an umbilical vein, and a fetal femoral artery and vein at...