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Effects Of Progesterone Or Progesterone And Gnrh Administration On Blood Serum Progesterone, Estradiol And Luteinizing Hormone In Prepuberal Beef Heifers, C. L. Henderson, H. L. Miller, M. B. Long, D. M. Marshall
Effects Of Progesterone Or Progesterone And Gnrh Administration On Blood Serum Progesterone, Estradiol And Luteinizing Hormone In Prepuberal Beef Heifers, C. L. Henderson, H. L. Miller, M. B. Long, D. M. Marshall
South Dakota Beef Report, 1994
A study using twelve prepuberal Angus heifers was conducted to determine the effects that synthetic progesterone with or without gonadotropin-releasing hormone (GnRH) had on blood serum concentrations of progesterone, estradiol, and luteinizing hormone (LH) over a 48-hour period. Four heifers were given an implant containing the synthetic progestogen norgestomet for 9 days. Four other heifers were given a similar implant and also received an injection of GnRH after implant removal. The remaining four heifers served as controls and received no treatment. Serum progesterone and estradiol concentrations did not differ between treatments (P> .8). Heifers receiving norgestomet and GnRH had increased …