ARPAS Poultry Certification Exam Questions and
Answers
1. What is the primary limiting amino acid in a typical corn-soybean meal diet for broiler
chickens?
A. Methionine
B. Lysine
C. Threonine
D. Tryptophan
Correct Answer: A
Expert Explanation: In poultry diets based on corn and soybean meal, methionine is the
first limiting amino acid, while lysine is typically the second limiting.
2. The process of egg formation in a laying hen takes approximately how many hours?
A. 24-26 hours
B. 18-20 hours
C. 12-14 hours
D. 30-32 hours
Correct Answer: A
Expert Explanation: The total time from ovulation to oviposition (laying the egg) is
approximately 24 to 26 hours in a high-producing laying hen.
3. Which anatomical structure in the avian respiratory system is responsible for vocalization?
A. Larynx
B. Pneumatic bone
C. Syrinx
D. Air sac
Correct Answer: C
Expert Explanation: The syrinx is the vocal organ of birds, located at the base of the
trachea where it branches into the bronchi.
4. In terms of mineral nutrition, what is the required Calcium to Available Phosphorus ratio
for broiler starters?
A. 1:1
, B. 4:1
C. 2:1
D. 10:1
Correct Answer: C
Expert Explanation: A ratio of approximately 2 parts calcium to 1 part available
phosphorus is generally recommended for skeletal development in young growing poultry.
5. Which virus is the causative agent of Marek’s Disease?
A. Retrovirus
B. Herpesvirus
C. Birnavirus
D. Coronavirus
Correct Answer: B
Expert Explanation: Marek’s Disease is caused by an Alphaherpesvirus (Gallid
alphaherpesvirus 2), characterized by T-cell lymphomas and peripheral nerve
enlargement.
6. What is the primary function of the ventriculus in the poultry digestive tract?
A. Enzymatic digestion
B. Storage of feed
C. Bacterial fermentation
D. Mechanical grinding
Correct Answer: D
Expert Explanation: The ventriculus, or gizzard, is the muscular stomach used for
mechanical digestion and grinding of feed, often with the help of grit.
7. Which enzyme is commonly added to poultry diets to increase the availability of plant-
bound phosphorus?
A. Amylase
B. Phytase
C. Protease
D. Xylanase
Correct Answer: B
Answers
1. What is the primary limiting amino acid in a typical corn-soybean meal diet for broiler
chickens?
A. Methionine
B. Lysine
C. Threonine
D. Tryptophan
Correct Answer: A
Expert Explanation: In poultry diets based on corn and soybean meal, methionine is the
first limiting amino acid, while lysine is typically the second limiting.
2. The process of egg formation in a laying hen takes approximately how many hours?
A. 24-26 hours
B. 18-20 hours
C. 12-14 hours
D. 30-32 hours
Correct Answer: A
Expert Explanation: The total time from ovulation to oviposition (laying the egg) is
approximately 24 to 26 hours in a high-producing laying hen.
3. Which anatomical structure in the avian respiratory system is responsible for vocalization?
A. Larynx
B. Pneumatic bone
C. Syrinx
D. Air sac
Correct Answer: C
Expert Explanation: The syrinx is the vocal organ of birds, located at the base of the
trachea where it branches into the bronchi.
4. In terms of mineral nutrition, what is the required Calcium to Available Phosphorus ratio
for broiler starters?
A. 1:1
, B. 4:1
C. 2:1
D. 10:1
Correct Answer: C
Expert Explanation: A ratio of approximately 2 parts calcium to 1 part available
phosphorus is generally recommended for skeletal development in young growing poultry.
5. Which virus is the causative agent of Marek’s Disease?
A. Retrovirus
B. Herpesvirus
C. Birnavirus
D. Coronavirus
Correct Answer: B
Expert Explanation: Marek’s Disease is caused by an Alphaherpesvirus (Gallid
alphaherpesvirus 2), characterized by T-cell lymphomas and peripheral nerve
enlargement.
6. What is the primary function of the ventriculus in the poultry digestive tract?
A. Enzymatic digestion
B. Storage of feed
C. Bacterial fermentation
D. Mechanical grinding
Correct Answer: D
Expert Explanation: The ventriculus, or gizzard, is the muscular stomach used for
mechanical digestion and grinding of feed, often with the help of grit.
7. Which enzyme is commonly added to poultry diets to increase the availability of plant-
bound phosphorus?
A. Amylase
B. Phytase
C. Protease
D. Xylanase
Correct Answer: B
