Resynchronization of ovulation and timed insemination in lactating dairy cows I: use of the Ovsynch and Heatsynch protocols after non-pregnancy diagnosis by ultrasonography.

@article{Bartolome2005ResynchronizationOO,
  title={Resynchronization of ovulation and timed insemination in lactating dairy cows I: use of the Ovsynch and Heatsynch protocols after non-pregnancy diagnosis by ultrasonography.},
  author={Julian A. Bartolome and Flavio T. Silvestre and Shunichi Kamimura and A C M Arteche and Pedro Melendez and D Kelbert and Jean McHale and Kenneth Swift and Louis F Archbald and William Watters Thatcher},
  journal={Theriogenology},
  year={2005},
  volume={63 6},
  pages={1617-27}
}
The objective was to compare pregnancy rates and pregnancy losses in lactating dairy cows that were diagnosed not pregnant and re-inseminated following either the Ovsynch or Heatsynch protocols. Also evaluated were the effects of stages of the estrous cycle, ovarian cysts and anestrus on pregnancy rates for both treatments. Non-pregnant cows (n = 332) as determined by ultrasonography on day 27 post-AI (study day 0) were divided into two groups. Cows in the Ovsynch group (n = 166) received GnRH… CONTINUE READING

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