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In ruminants, these cells migrate from the trophoblast to the maternal epithelium:

They produce placental lactogen and pregnancy-specific protein B (often used in pregnancy testing). Additional Resources In ruminants, these cells migrate from the trophoblast

Involved in smooth muscle contraction (milk letdown, parturition). parturition). Maintains pregnancy

Maintains pregnancy; produced by large and small luteal cells. Leydig Cells (Testes) Crucial for sperm production and male characteristics. Oxytocin Large Luteal Cells / Hypothalamus In ruminants, these cells migrate from the trophoblast