Queen Heat Cycle: 14-21 Days and When to Breed

Ovulation in the cat is triggered by mating, not by a date on the calendar, so timing decides whether a breeding takes. A queen cycles about every 14 to 21 days in the long-day season and stands for 5 to 7 days. Mate on days 2 and 3 of standing heat, three times at 4-hour intervals, and confirm ovulation with progesterone above 2 ng/mL before you count days to a due date.

The 14 to 21 Day Rhythm

Cats are seasonally polyestrous, long-day breeders. Cycling starts when daylight reaches roughly 12 hours and usually runs from February to October in the northern hemisphere. Under 14 hours of artificial light a cattery can keep queens cycling all year, which is convenient for scheduling and hard on body condition. Each cycle has three parts: 1 to 2 days of proestrus, 5 to 7 days of estrus, and 7 to 14 days of interestrus when ovulation did not happen. That sums to the 14 to 21 days most breeders use as a working interval.

A queen that has cycled 4 or 5 times without conceiving needs a veterinary workup rather than another month of waiting. Repeated non-ovulatory cycles raise the risk of cystic endometrial hyperplasia and pyometra, and both are easier to prevent than to treat.

Reading Days 1 to 7

Proestrus: rubbing on furniture, louder voice, tail up, but she refuses the male. Estrus: she crouches, treads with the hind legs, deviates the tail, and holds still when you press on the lower back, which is the lordosis reflex. Calling often comes in blocks of 2 to 4 hours, worst at night. Interestrus: behavior returns to baseline within 24 to 48 hours, sometimes after a day of unusually loud affection.

Log four things every morning: tail deviation under hand pressure, treading, appetite (many queens drop 20 to 30 percent of intake at peak estrus), and vulvar swelling, which is far subtler in cats than in dogs. A queen who accepts the stud on day 1 of your log was probably already standing the day before, so the log matters more than the date of the first mating.

Why Three Matings Beat One

Cats are induced ovulators. The penis carries keratinized spines, and every intromission sends a reflex signal that releases GnRH and LH. A single mating often releases too little LH to rupture follicles, which is why one cover produces disappointing litter rates. Three matings at roughly 4-hour intervals on the same day is the pattern most breeders and theriogenologists describe, and it reaches an ovulation rate near 90 percent in healthy queens. Ovulation itself follows 24 to 48 hours after the ovulatory mating.

A worked schedule: detect standing heat on day 1; breed on day 2 at 08:00, 12:00 and 16:00; add one morning mating on day 3 if she is still standing. Keep sessions supervised and short, 10 to 15 minutes, because a queen can turn on the male within seconds of dismounting and a stud can be badly scratched in an unattended cage.

Progesterone Is the Only Number That Matters

Progesterone comes from corpora lutea, which exist only after ovulation. One sample drawn 5 to 7 days after the first mating tells you what happened. Above 2 ng/mL confirms ovulation; 2 to 8 ng/mL is an ordinary luteal phase; below 1 ng/mL on day 7 means no ovulation and the queen is heading into a false pregnancy, with 30 to 40 days of nesting, toy carrying and appetite changes before she cycles again. A value that falls under 2 ng/mL before day 30 of a confirmed pregnancy is a reason to call the vet the same day. Once ovulation is confirmed, work from the pregnancy timeline week by week instead of counting on a calendar.

Estrous Day, Behavior, Best Move

Day of heat	What you see	What to do
1	Calling, rubbing, tail up, refuses the male	Log it. No mating yet. Check appetite and vulva.
2	Stands for hand pressure, treads, deviated tail	First mating block: 3 covers at 4-hour intervals
3	Still standing, often calmer	1 to 2 top-up matings in the morning
4 to 5	Interest fading, refuses the male again	Stop. Progesterone at day 5 to 7 after first cover
6 to 7	Back to normal behavior	Confirm ovulation, then set the due date
14 to 21	Heat returns if no ovulation	Re-check stud, weight and progesterone protocol

When to Skip a Cycle

• Queen under 12 months old or under 2.5 kg.
• Body condition score below 3/9 or above 7/9.
• Fewer than 6 months since the last litter, or a third litter inside 24 months; the recovery window is set out in postpartum queen care.
• Any history of dystocia, cesarean section or metritis.
• Stud with an untreated skin, eye or upper respiratory infection.

Records That Save a Litter

Write down the first day of heat, every mating with a time, the progesterone value with its draw date, and a due date calculated at 63 to 65 days from the ovulatory mating. Twenty to thirty breedings of this kind of data will show you which stud and which day works for a given queen, and that beats any general rule you can read. Keep the sheets for at least 3 years, because patterns across sisters and daughters are where catteries actually improve.

Five Steps for This Cycle

1. Start daily heat logs 2 weeks before the expected cycle.
2. Breed only on days 2 and 3 of standing heat, 3 covers, 4 hours apart.
3. Draw progesterone on day 5 to 7 after the first mating.
4. Book the ultrasound for day 21 to 25, not earlier.
5. Set the due date at 63 to 65 days and have the box ready by day 55.

None of this replaces a veterinarian who knows your lines. Queens that fail to conceive twice with confirmed ovulation, or that lose two litters in a row, need a full fertility workup including thyroid, FeLV/FIV status and uterine imaging. A queen retired from breeding at 4 or 8 should still be spayed, and timing that surgery around her last litter matters for how she recovers.

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