Estrous behavior in confined beef cows.

@article{Hurnik1987EstrousBI,
  title={Estrous behavior in confined beef cows.},
  author={J. F. Hurnik and Gordon J. King},
  journal={Journal of animal science},
  year={1987},
  volume={65 2},
  pages={431-8}
}
Forty-two postpartum beef cows were continuously monitored for behavioral signs of estrus until 100 d postpartum. Twice-weekly blood samples were collected and assayed for plasma progesterone concentrations. The duration of standing increased, recumbency decreased and intra-pen ambulation increased significantly on the day of estrus in comparison to the average of the 4 d prior to and after estrus. The average duration of the receptivity phase (standing when mounted) was 4.4 h, with a range of… CONTINUE READING

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