1. Sorensen AM. Estrus and the estrous cycle. In: Animal reproduction: principles and practices. New York: McGraw-Hill, 1979:234–67.
2. Moore NW, Miller BG, Trappl MN. Transport and development of embryos transferred to the oviducts and uteri of entire and ovariectomized ewes. J Reprod Fertil 1983;68:129–35.
3. Pope WF. Uterine asynchrony: a cause of embryonic loss. Biol Reprod 1988;39: 999–1003.
4. Ing NH, O’Malley BW. The steroid hormone receptor superfamily: molecular mechanisms of action. In: Weintraub B, ed. Molecular endocrinology: basic concepts and clinical correlations. New York: Raven Press, 1995:195–216.
5. Clark JH, Schrader WT, O’Malley BW. Mechanisms of action of steroid hormones. In: Wilson JD, Foster DW, eds. William’s textbook of endocrinology. Philadelphia: Saunders, 1992:35–89.