Why is it getting more difficult to successfully artificially inseminate dairy cows?

@article{Dobson2008WhyII,
  title={Why is it getting more difficult to successfully artificially inseminate dairy cows?},
  author={Hannah Dobson and Susan L. Walker and Michael J Morris and J E Routly and Robert Frank Smith},
  journal={Animal : an international journal of animal bioscience},
  year={2008},
  volume={2 8},
  pages={1104-1111}
}
Successfully using artificial insemination (AI) is defined as getting cows pregnant when the farmer wants them in-calf and making the best use of appropriate genetic potential. Over the past 30 to 50 years, the percentage of animals in oestrus that stand-to-be-mounted (STBM) has declined from 80% to 50%, and the duration of STBM from 15 h to 5 h; both in parallel with a reduction in first-service-pregnancy-rate from 70% to 40%. Meanwhile, the incidence of lameness and mastitis has not decreased… CONTINUE READING
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