Overview of Ovulation Timing
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Table 1. Correlation of serum progesterone concentration with significant reproductive events in the bitch. The margin of error is estimated to be about +/- 1 days.
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Serum Progesterone (ng/ml)
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Event
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Less than 1.0
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Anestrus or proestrus
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1.0 - 1.9
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Ovulation minus 3 days – recommend recheck
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2.0 - 2.9
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Ovulation minus 2 days
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3.0 - 3.9
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Ovulation minus 1 day
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4.0 - 10.0
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Ovulation day
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-
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Ovulation plus 2 days is optimal breeding day
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Greater than 10.0 with cornified vaginal smear
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Ovulation plus 1 to 5 days
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Table 2. Suggested days of cycle for insemination of bitches depending on the type of breeding management being conducted.
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Type of Breeding Management
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Days to Breed or Inseminate
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Natural mating or fresh semen AI
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3 to 6 days after the LH surge (i.e., 1 to 4 days after ovulation)
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Chilled fresh semen
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4 to 6 days after LH surge (i.e., 2 to 4 days after ovulation)
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Frozen-thawed semen
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5 to 6 days after the LH surge (i.e., 3 to 4 days after ovulation)
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