Domestic Species Comparison: Cycle Length, Heat, and Ovulation

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Last updated 12:46 AM on 4/20/26
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40 Terms

1
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Alpaca Classification

Polyestrus

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Dog Classification

Monoestrus

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Cow Classification

Polyestrus

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Ewe Classification

Seasonally Polyestrus (Short Day)

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Llama Classification

Polyestrus

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Mare Classification

Seasonally Polyestrus (Long Day)

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Queen Classification

Polyestrus

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Sow Classification

Polyestrus

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Alpaca Length of Estrous Cycle

15 d (11-18 d)

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Dog Length of Estrous Cycle

6 mo (3 - 9 mo)

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Cow Length of Estrous Cycle

21 d (17 - 24 d)

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Ewe Length of Estrous Cycle

17 d (13 - 19 d)

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Llama Length of Estrous Cycle

10 d (8 - 12 d)

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Mare Length of Estrous Cycle

21 d (15 - 26 d)

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Queen Length of Estrous Cycle

17 d (4 - 30 d)

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Sow Length of Estrous Cycle

21 d (17 - 25 d)

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Alpaca Duration of Estrus

5 d (4 - 5 d)

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Dog Duration of Estrus

9 d (4 - 21 d)

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Cow Duration of Estrus

15 h (6 - 24 h)

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Ewe Duration of Estrus

30 h (18 - 48 h)

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Llama Duration of Estrus

5 d (4 - 5 d)

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Mare Duration of Estrus

7 d (2 - 12 d)

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Queen Duration of Estrus

9 d (2 - 19 d)

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Sow Duration of Estrus

50 h (12 - 96 h)

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Alpaca Time from Onset of Estrus to Ovulation

Induced ovulator

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Dog Time from Onset of Estrus to Ovulation

4 - 24 d

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Cow Time from Onset of Estrus to Ovulation

24 - 32 h

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Ewe Time from Onset of Estrus to Ovulation

24 - 30 h

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Llama Time from Onset of Estrus to Ovulation

Induced ovulator

30
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Mare Time from Onset of Estrus to Ovulation

5 d

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Queen Time from Onset of Estrus to Ovulation

Induced ovulator

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Sow Time from Onset of Estrus to Ovulation

36 - 44 h

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Alpaca Time from LH Surge to Ovulation

26 - 36 h

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Dog Time from LH Surge to Ovulation

2 - 3 d

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Cow Time from LH Surge to Ovulation

28 h

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Ewe Time from LH Surge to Ovulation

26 h

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Llama Time from LH Surge to Ovulation

24 - 36 h

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Mare Time from LH Surge to Ovulation

2 d

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Queen Time from LH Surge to Ovulation

30 - 40 h

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Sow Time from LH Surge to Ovulation

40 h