Question

Which of the following is a definite sign of oestrous in bovines?

• A. Restlessness
• B. Frequent urination
• C. Mounting on other cows
• D. Standing to be mounted

Hint:

"The stander is the one in heat." This simple rule helps farmers and technicians identify the correct animal to breed, reducing wasted semen and improving conception rates.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Accurate detection of estrus is critical for successful artificial insemination (AI) and herd fertility management in cattle.
Signs of estrus are divided into primary (definitive) and secondary signs.

Step 2: Detailed Explanation:
Let us analyze the behavioral signs of estrus in bovines:
- Secondary signs include restlessness, chin resting, vocalization, hyperpigmented vulva, clear mucus discharge, and mounting other cows.
While these signs suggest a cow is near or in heat, they can occur during proestrus or metestrus and are not definitive proof of standing estrus.
- Standing to be mounted (standing heat) is the primary, absolute, and definitive behavioral sign of estrus.
When a cow remains stationary and allows another animal to mount her, she is in true standing heat under the influence of peak estrogen concentrations.
This behavioral acceptance indicates that she is ready for mating and that ovulation will occur approximately 24-30 hours after the onset of this behavior.

Step 3: Final Answer:
Standing to be mounted is the only definite, primary sign of estrus in cattle.