Cattle Reproduction
Cattle Estrus Cycle Calculator
Calculate expected estrus cycle windows and next insemination timing based on last heat or breeding date.
Breeding Timing (AM/PM Rule)
Standing heat observed in the AM calls for breeding in the PM. Standing heat in the PM calls for breeding the next AM.
Next Expected Estrus
21 Gün Döngüsü
Earliest (Day 18)
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Peak Target (Day 21)
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Latest (Day 24)
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Management Advice
Frequently Asked Questions
How long is the estrous cycle in dairy cattle?
The average estrous cycle length in cattle is 21 days, with a normal physiological range between 18 and 24 days.
What is the optimal insemination timing (AM/PM Rule)?
According to the classic AM/PM rule: cows detected in standing heat in the morning should be bred the following evening; cows in heat in the evening should be bred the next morning.
What is silent heat in dairy cows?
Silent heat occurs when physiological ovulation takes place without noticeable behavioral standing reflexes. Digital activity tags and pedometers are best suited to detect it.
Cattle Estrus Detection & Fertility Guide
The fundamental objective of commercial dairy farming is to achieve one calf per cow per year. Missing a heat cycle results in an unnecessary 21 open days, costing substantial lost milk yields and extended dry period maintenance.