Which of the following is NOT a reliable indicator that a cow is on heat and ready to be artificially inseminated?

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Question restated: Which of the following is NOT a reliable indicator that a cow is on heat and ready to be artificially inseminated?

Option 1: The cow has slobber on her back and the applied tail paint has become ruffled.
This combination is not a standard, dependable sign of estrus. Slobber can occur for many reasons unrelated to heat, and tail paint (or dye) can be disturbed by movement, weather, or grooming, making it an unreliable indicator.

Option 2: The cow mounts other cows.
A cow mounting behavior can be observed for several reasons, including social interactions, dominance, or general activity, not exclusively heat. While mounting can occur during estrus, it is not a definitive or standalone indicator of readiness for insemination because it may happen outside of heat periods.

Option 3: The cow stands to be mounted by other cows.
This is a classic sign associated with standing heat (estrus) in which a cow will stand to be mounted. It is generally considered a reliable behavioral cue indicating she is in heat and receptive to breeding, though it should be corroborated with other signs.

Option 4: The hair at the base of her tail has become ruffled or rubbed.
Physical changes such as rubbing or hair disruption at the tail base can occur due to frequent mounting by others, indicating that the cow has been in a heat state. While supportive of estrus, this sign is not as reliable on its own as direct behavioral cues like standing heat, but it can still be informative when combined with other observations.

Option 5: The heat mount detector glued to the base of her tail has become activated and turned red.
Technologies like a heat mount detector are designed to provide an objective signal of mounting activity and are generally considered reliable indicators when functioning properly. Activation with a clear color change aligns with expected monitoring data during estrus.

Summary: Several indicators (such as standing to be mounted and mount-related behaviors) are commonly used to assess estrus, but some signs (like slobber on the back with tail paint disturbance) can be misleading or nonspecific. The reliability of tail-base hair changes varies and is usually supplementary rather than definitive. The presence of an active mounting detector is typically a more objective and reliable cue when it indicates mounting activity during estrus.

AGRI10049_2025_SM2 AGRI10049 Mid Semester Exam- Requires Respondus LockDown Browser

Which of the following is NOT a reliable indicator that a cow is on heat and ready to be artificially inseminated?

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