The uterine glands secrete 'Uterine milk' under the influence of estrogen and progesterone hormone, composed of

The uterine glands secrete 'Uterine milk' under the influence of estrogen and progesterone hormone, composed of Protein, Fat and Glycogen.
Uterine milk is part of the embryotroph. It is a white secretion containing proteins and amino acids that nourish the embryo during development. The uterine milk is the actual nutritional liquid that feeds the embryo, while the embryotroph is the uterine milk plus the syncytiotrophoblast.
The uterine milk proteins (UTMP) are the major proteins secreted by the endometrium, primarily under the control of progesterone.