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- W2091992602 abstract "Previously, it was reported that chronic intra-uterine infusion of PGE1 or PGE2 every four hours inhibited luteolysis in ewes. However, estradiol-17β or PGE2 given intra-uterine every 8 h did not inhibit luteolysis in heifers, but infusion of estradiol + PGE2 inhibited luteolysis in heifers. The objective of this experiment was to determine whether and how intra-luteal implants containing PGE1 or PGE2 prevent luteolysis in Angus or Brahman cows. On day-13 post-estrus, Angus cows received no intra-luteal implant and corpora lutea were retrieved or Angus and Brahman cows received intra-luteal silastic implants containing Vehicle, PGE1, or PGE2 and corpora lutea were retrieved on day-19. Coccygeal blood was collected daily for analysis for progesterone. Breed did not influence the effect of PGE1 or PGE2 on luteal mRNA for LH receptors or unoccupied or occupied luteal LH receptors did not differ (P > 0.05) so the data were pooled. Luteal weights of Vehicle-treated Angus or Brahman cows from days-13–19 were lower (P < 0.05) than those treated with intra-luteal implants containing PGE1 or PGE2. Day-13 Angus luteal weights were heavier (P < 0.05) than Vehicle-treated Angus cows on day-19 and luteal weights of day-13 corpora lutea were similar (P > 0.05) to Angus cows on day-19 treated with intra-luteal implants containing PGE1 or PGE2. Profiles of circulating progesterone in Angus or Brahman cows treated with intra-luteal implants containing PGE1 or PGE2 differed (P < 0.05) from controls, but profiles of progesterone did not differ (P > 0.05) between breeds or between cows treated with intra-luteal implants containing PGE1 or PGE2. Intra-luteal implants containing PGE1 or PGE2 prevented (P < 0.05) loss of luteal mRNA for LH receptors and unoccupied or occupied receptors for LH compared to controls. It is concluded that PGE1 or PGE2 alone delays luteolysis regardless of breed. We also conclude that either PGE1 or PGE2 prevented luteolysis in cows by up-regulating expression of mRNA for LH receptors and by preventing loss of unoccupied and occupied LH receptors in luteal tissue." @default.
- W2091992602 created "2016-06-24" @default.
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- W2091992602 date "2011-08-01" @default.
- W2091992602 modified "2023-10-18" @default.
- W2091992602 title "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" @default.
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