Length of Estrus (Heat Period) in Ewe

Length of estrus (heat period) in ewe is:

Correct Answer: 36 hours

The duration of estrus (heat period) in the ewe is 36 hours. This is the phase during which the ewe is sexually receptive and stands for mounting by the ram.

Important Distinction

• Estrous cycle length (ewe): 17 days
• Estrus (heat) duration (ewe): 36 hours ✔

Ovulation in Ewe

• Ovulation occurs approximately 24–30 hours after onset of estrus — near the end of the heat period.
• This is important for timing of AI — insemination 12–16 hours after heat detection gives optimal conception.

Heat Duration Comparison Table

• Cattle: 12–24 hours
• Mare: 6 days (longest)
• Sow: 2–2.5 days
• Ewe: 36 hours ✔
• Doe: 48 hours
• Bitch: 9 days