Administration of human chorionic gonadotropin at embryo transfer induced ovulation of a first wave dominant follicle, and increased progesterone and transfer pregnancy rates.

@article{Wallace2011AdministrationOH,
  title={Administration of human chorionic gonadotropin at embryo transfer induced ovulation of a first wave dominant follicle, and increased progesterone and transfer pregnancy rates.},
  author={L. D. Wallace and C. A. Breiner and R.A. Breiner and A. R. Spell and J. A. Carter and Graham Cliff Lamb and Jeffrey S. Stevenson},
  journal={Theriogenology},
  year={2011},
  volume={75 8},
  pages={
          1506-15
        }
}

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References

SHOWING 1-10 OF 42 REFERENCES
Evaluation of human chorionic gonadotropin as a replacement for gonadotropin-releasing hormone in ovulation-synchronization protocols before fixed timed artificial insemination in beef cattle.
TLDR
Compared with a breeding season having only 1 TAI and longer exposure to cleanup bulls, total breeding season pregnancy rate was reduced by one-third, subsequent calving distribution was altered, and 50% more AI-sired calves were obtained by applying 2 TAI during the breeding season.
Effect of human chorionic gonadotrophin on dominant follicles in cows: formation of accessory corpora lutea, progesterone production and pregnancy rates.
TLDR
It is suggested that hCG treatment at 7 days after insemination could be used to produce accessory corpora lutea, raise plasma progesterone concentration and hence reduce the incidence of early embryonic mortality in cattle.
Effects of Human Chorionic Gonadotrophin Administration on Artificial Insemination Pregnancy Rates in Beef Heifers
TLDR
Whether administering human chorionic gonadotropin at 5 d post-AI improves fertility in beef heifers by increasing serum progesterone concentrations by P>0.10 is investigated.
Effect of human chorionic gonadotropin on luteal function and reproductive performance of high-producing lactating Holstein dairy cows.
TLDR
Treatment with hCG on d 5 after AI induces accessory CL, enhances plasma progesterone concentration, and improves conception rate of high-producing dairy cows, and pregnancy losses were similar between treatment groups.
Effect of administration of human chorionic gonadotropin after artificial insemination on concentrations of progesterone and conception rates in beef heifers.
TLDR
Administration of hCG 5 to 6 d after AI did not improve conception or pregnancy rates at two out of three locations evaluated, suggesting insufficient progesterone is not a major factor contributing to early pregnancy failure in beef heifers.
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