CAS Avian Reproduction & Breeding 2

Question 1

What is the primary environmental cue that triggers the hormonal cascade initiating reproductive behavior in most bird species?

Accepted Answer

Changes in photoperiod (day length)

Answer

Photoperiod (day length) is the primary environmental cue detected by the hypothalamic-pituitary-gonadal axis to initiate reproductive activity in most birds.

Question 2

What relative humidity level is generally recommended during the first two-thirds of incubation for most parrot eggs?

Accepted Answer

40–50%

Answer

A relative humidity of approximately 40–50% is recommended during most of incubation to allow for the correct rate of moisture loss from the egg.

Question 3

The technique of 'double clutching' in avian breeding refers to:

Accepted Answer

Removing the first clutch to stimulate the hen to produce a second clutch

Answer

Double clutching involves removing the first clutch for artificial incubation, which stimulates the hen to produce a second clutch and effectively doubles annual egg production.

Question 4

How frequently should eggs be turned during artificial incubation to support proper embryonic development?

Accepted Answer

At least 3–5 times per day

Answer

Eggs should be turned at least 3–5 times daily (ideally every 1–2 hours) to prevent embryo adhesion to shell membranes and ensure even heat distribution.

Question 5

What does the term 'lockdown' refer to during the artificial incubation process?

Accepted Answer

Stopping egg turning and raising humidity for the final hatch period

Answer

Lockdown refers to the final 2–3 days before hatch when egg turning stops and humidity is increased to facilitate the chick's internal and external pip.

(CAS) Certified Avian Specialist Practice Test

(CAS) Certified Avian Specialist Practice Test

CAS Avian Reproduction & Breeding 2