ARPAS Poultry Science Professional Examination
Questions and Answers
1. Which amino acid is typically considered the first limiting amino acid in a standard corn-
soybean meal diet for broiler chickens?
A. Lysine
B. Threonine
C. Methionine
D. Tryptophan
Correct Answer: C
Expert Explanation: In corn-soybean meal based diets for poultry, methionine is the first
limiting amino acid because corn and soy are relatively deficient in sulfur-containing amino
acids compared to the bird’s requirements.
2. In the avian reproductive tract, where does the formation of the thin and thick egg white
(albumen) primarily occur?
A. Infundibulum
B. Isthmus
C. Magnum
D. Uterus
Correct Answer: C
Expert Explanation: The magnum is the longest section of the oviduct and is responsible
for the secretion of the albumen (egg white) around the yolk.
3. What is the standard incubation period for a domestic turkey egg?
A. 28 days
B. 24 days
C. 21 days
D. 32 days
Correct Answer: A
Expert Explanation: While chicken eggs take 21 days to hatch, turkey and duck eggs
typically require an incubation period of 28 days.
, 4. Which organ in the poultry digestive system is responsible for mechanical grinding of feed,
often aided by grit?
A. Proventriculus
B. Ventriculus
C. Ceca
D. Crop
Correct Answer: B
Expert Explanation: The ventriculus, commonly known as the gizzard, is a muscular organ
that grinds food particles into smaller sizes for better digestion.
5. What is the primary site of calcium carbonate deposition during the formation of the
eggshell?
A. Isthmus
B. Vagina
C. Shell Gland (Uterus)
D. Magnum
Correct Answer: C
Expert Explanation: The uterus, or shell gland, is where the egg spends the majority of its
time (about 20 hours) and where the hard shell is deposited.
6. A deficiency in which vitamin is most commonly associated with the development of
rickets in growing chicks?
A. Vitamin A
B. Vitamin D3
C. Vitamin E
D. Vitamin K
Correct Answer: B
Expert Explanation: Vitamin D3 is essential for the proper absorption of calcium and
phosphorus; a deficiency leads to poor bone mineralization, resulting in rickets.
7. Which of the following poultry diseases is caused by a protozoan parasite and primarily
affects the intestinal lining?
A. Coccidiosis
B. Marek’s Disease
Questions and Answers
1. Which amino acid is typically considered the first limiting amino acid in a standard corn-
soybean meal diet for broiler chickens?
A. Lysine
B. Threonine
C. Methionine
D. Tryptophan
Correct Answer: C
Expert Explanation: In corn-soybean meal based diets for poultry, methionine is the first
limiting amino acid because corn and soy are relatively deficient in sulfur-containing amino
acids compared to the bird’s requirements.
2. In the avian reproductive tract, where does the formation of the thin and thick egg white
(albumen) primarily occur?
A. Infundibulum
B. Isthmus
C. Magnum
D. Uterus
Correct Answer: C
Expert Explanation: The magnum is the longest section of the oviduct and is responsible
for the secretion of the albumen (egg white) around the yolk.
3. What is the standard incubation period for a domestic turkey egg?
A. 28 days
B. 24 days
C. 21 days
D. 32 days
Correct Answer: A
Expert Explanation: While chicken eggs take 21 days to hatch, turkey and duck eggs
typically require an incubation period of 28 days.
, 4. Which organ in the poultry digestive system is responsible for mechanical grinding of feed,
often aided by grit?
A. Proventriculus
B. Ventriculus
C. Ceca
D. Crop
Correct Answer: B
Expert Explanation: The ventriculus, commonly known as the gizzard, is a muscular organ
that grinds food particles into smaller sizes for better digestion.
5. What is the primary site of calcium carbonate deposition during the formation of the
eggshell?
A. Isthmus
B. Vagina
C. Shell Gland (Uterus)
D. Magnum
Correct Answer: C
Expert Explanation: The uterus, or shell gland, is where the egg spends the majority of its
time (about 20 hours) and where the hard shell is deposited.
6. A deficiency in which vitamin is most commonly associated with the development of
rickets in growing chicks?
A. Vitamin A
B. Vitamin D3
C. Vitamin E
D. Vitamin K
Correct Answer: B
Expert Explanation: Vitamin D3 is essential for the proper absorption of calcium and
phosphorus; a deficiency leads to poor bone mineralization, resulting in rickets.
7. Which of the following poultry diseases is caused by a protozoan parasite and primarily
affects the intestinal lining?
A. Coccidiosis
B. Marek’s Disease
