Wootton R, McFadyen I R, Cooper J E
Biol Neonate. 1977;31(5-6):333-9. doi: 10.1159/000240984.
In 12 pregnant sows (Sus scrofa domestica), containing 144 live fetuses, placental blood flow was measured by the indicator fractionation technique using radioactive microspheres. In 8 of these litters, which contained 96 live fetuses, placental blood flow as obtained in absolute units. Significant positive correlations were observed between placental blood flow and placental weight, between placental blood flow and fetal weight, and between placental weight and fetal weight. It is clear that the runt, by comparison with his littermates, has a low birthweight in association with a small placenta and a low placental blood flow.
在12头怀孕母猪（家猪）中，共有144个活胎儿，采用放射性微球指示剂分离技术测量胎盘血流量。在其中8窝共96个活胎儿中，获得了以绝对单位表示的胎盘血流量。观察到胎盘血流量与胎盘重量之间、胎盘血流量与胎儿体重之间以及胎盘重量与胎儿体重之间存在显著正相关。显然，与同窝仔猪相比，发育不良的仔猪出生体重低，胎盘小且胎盘血流量低。
