Spotting Heat and Timing AI — The AM/PM Rule Every Farmer Should Know

A missed heat costs three weeks. A mistimed insemination costs the AI fee and three weeks. Since heat lasts less than a day and the fertile window inside it is shorter still, the difference between farmers who "get animals settled first time" and those forever repeating is mostly observation and timing — both free.

The one sign that counts most

Standing heat: the animal stands still and accepts mounting by another animal. This is the definitive sign — the clock for insemination starts from when standing behaviour begins. Everything else is supporting evidence.

The supporting signs

• Clear, stretchy discharge hanging like glass thread from the vulva
• Restlessness, bellowing, reduced feed interest and a visible milk dip that day
• Mounting others (often precedes standing), sniffing, chin-resting
• Mud/rub marks on hips and tailhead where others mounted her
• Slight swelling and moist pinkness of the vulva

Individually suggestive; together with standing behaviour, conclusive.

When to watch

Heats show themselves at quiet, cool hours — early morning and late evening. An animal may hide heat entirely during hot noisy afternoons. Two deliberate 20-minute watches daily, morning and evening, when animals are loose and undistracted, catch the majority of heats that casual daytime glances miss. Tie-stall animals need extra intent: watch at untying times, and take discharge and behaviour clues seriously since mounting can't happen tied.

The AM/PM rule

The traditional and still widely taught timing guide:

• Standing heat first seen in the morning → inseminate that evening.
• First seen in the evening → inseminate next morning.

The logic: the egg releases toward the end of heat, and semen needs some hours in place — so AI works best in the second half of heat, roughly 12 hours after heat is first noticed. Inseminating the moment you spot heat is usually too early; that's a common hidden cause of "AI failed again."

Keep a date diary

Note every heat, served or not. Cycles run about three weeks, so today's entry predicts next month's watch window — and a diary of dates is exactly what your AI technician or vet needs when something's irregular.

Sharp eyes, twice a day, and the AM/PM rule — conception rates rise on observation before anything else. (And a well-fed animal in good body condition shows heat loudest — nutrition and fertility are old partners.)

For feeding that keeps heats regular and visible, call or WhatsApp Falah Enterprises, Authorized GOKA Feeds Distributor, Anantnag.