Postinsemination administration of receptal: follicular dynamics, duration of cycle, hormonal responses, and pregnancy rates.

@article{Stevenson1993PostinseminationAO,
  title={Postinsemination administration of receptal: follicular dynamics, duration of cycle, hormonal responses, and pregnancy rates.},
  author={Jeffrey S. Stevenson and A. P. Phatak and Immo Rettmer and R. E. Stewart},
  journal={Journal of dairy science},
  year={1993},
  volume={76 9},
  pages={
          2536-47
        }
}
In experiment 1, concentrations of LH, FSH, and progesterone, but not estradiol-17 beta, in blood serum were increased during 6 to 12 h after injection of 8 micrograms of receptal (GnRH agonist) administered on d 11 to 14 after estrus (d 0) and at first AI compared with saline treatment in lactating Holstein cows. Beginning 2 to 3 d after injection of receptal, concentrations of progesterone were increased for 3 d in nonpregnant cows and for 12 d in pregnant cows compared with controls of… 
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TLDR
The interval to first ovulation after GnRH injection was shorter in cows responding to GnRH than in those failing to respond, and the proportion of cows that responded to Gn RH tended to be higher in cows receiving progestogen than in control cows.
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TLDR
No treatment-induced ovulations or changes in the number of ovarian follicles were observed after the injection of the GnRH agonist and pregnancy rates were 58% in both treatment groups.
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TLDR
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TLDR
It is concluded that supplementing cows with progesterone after insemination initially failed to improve pregnancy rates but appeared to increase pregnancy rate at the subsequent service.
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TLDR
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TLDR
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TLDR
The use of 10 micrograms of the GnRH analogue, buserelin, 11 to 13 d after insemination, cannot be recommended as a method of improving reproductive performance in dairy herds.
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