ALAT Animal Identification Techniques

Question 1

Which permanent identification method involves creating a unique pattern of holes or cuts in a rodent's ear?

Accepted Answer

Ear notching or punching

Answer

Subcutaneous microchip implant

Answer

Tail tattooing

Answer

Toe clipping

Question 2

What is the most reliable method for sexing neonatal mice when external genitalia are not yet differentiated?

Accepted Answer

Anogenital distance

Answer

Coat color at birth

Answer

Body weight comparison

Answer

Presence of nipples

Question 3

Which identification technology uses a radio-frequency device implanted subcutaneously that emits a unique number when scanned?

Accepted Answer

Transponder (microchip)

Answer

Ear tag

Answer

Tattoo ink

Answer

Paint mark

Question 4

In the standard AALAS mouse ear-notch numbering system, notch positions in the RIGHT ear represent which values?

Accepted Answer

Single digits (1, 2, 4, 8)

Answer

Hundreds (100, 200, 400, 800)

Answer

Tens (10, 20, 40, 80)

Answer

Half-digits (0.5, 1, 2, 4)

Question 5

Which of the following is a TEMPORARY animal identification method?

Accepted Answer

Fur clipping or marking

Answer

Subcutaneous microchip

Answer

Ear tattooing

Answer

Ear punching

Question 6

A technician receives a shipment of adult rats and must confirm their sex before housing. Which external feature is most useful?

Accepted Answer

Anogenital distance and presence of a scrotal sac in males

Answer

Ear size and shape

Answer

Body weight alone

Answer

Coat texture