The relationship between amino nitrogen and protein concentrations in rabbit blastocyst fluid

Abstract

The queston of how the oligolecithal mammalian embryo is supplied with the material necessary for the synthesis of proteins, especially before nidation, is still open to investigation. The authors have studied the rabbit blastocyst fluid between the seventh and ninth days after mating and determined the α-amino nitrogen in this fluid. On the seventh day after mating, a high level of α-amino nitrogen was found in the blastocyst fluid, exceeding by five times the level in the maternal blood. The concentration of protein was only one tenth of the level in blood serum. During the period of implantation, a progressive decrease in α-amino nitrogen concentration and an increase in protein concentration takes place.