In vivo intra-luteal implants of prostaglandin (PG) E1 or E2 (PGE1, PGE2) prevent luteolysis in cows. I. Luteal weight, circulating progesterone, mRNA for luteal luteinizing hormone (LH) receptor, and occupied and unoccupied luteal receptors for LH

► Anti-luteolytic effects of PGE1 and PGE2 intra-luteal implants were evaluated in cows. ► PGE1 and PGE2 intra-luteal implants prevent loss of luteal weight. ► PGE1 and PGE2 intra-luteal implants prevent decreases in circulating progesterone. ► PGE1 and PGE2 intra-luteal implants prevent loss of luteal mRNA for LH receptors. ► PGE1 and PGE2 intra-luteal implants prevent loss of luteal unoccupied and occupied.