Most Confirmatory Sign of Heat in Cow

Most confirmatory sign of heat in cow is:

Correct Answer: Stand still on mounting (Standing reflex)

The most confirmatory (definitive) sign of estrus in the cow is the standing reflex (immobilization reflex) — the cow stands still and allows itself to be mounted by other cows or the bull. This is also known as standing heat or sexual immobilization reflex.

Other Signs of Estrus in Cattle (non-confirmatory)

• Restlessness and increased activity
• Bellowing/vocalization
• Clear, mucoid vulvar discharge
• Chin-resting on other cows
• Swollen, reddened vulva
• Decreased milk production
• Tail-head hair ruffled (riding marks)

Why Standing Reflex is Confirmatory

Other signs can occur during pre-estrus or post-estrus. Only the standing reflex reliably indicates true peak estrus (mid-heat), which is the optimal time for insemination. This is why heat detection in cattle relies primarily on observing standing behavior.