ARPAS ACCURATE REAL EXAM |200 QUESTIONS AND CORRECT
ANSWERS WITH DETAILED RATIONALES EACH | CURRENTLY TESTING
AND FREQUENTLY TESTED QUESTIONS | EXPERT VERIFIED FOR
GUARANTEED PASS | LATEST UPDATE
QUESTION 1
A digestive upset in cattle where large amounts of gas are trapped in the rumen is called?
A. Acidosis
B. Founder
C. Shipping fever
D. Bloat
Correct Answer: D. Bloat
Rationale: Bloat (ruminal tympany) occurs when fermentation gases (primarily CO₂ and
methane) cannot be eructated due to foam or physical obstruction. Acidosis involves lactic acid
buildup, founder is laminitis secondary to acidosis, and shipping fever is a respiratory disease
complex.
QUESTION 2
How many days are in an average gestation period for a dairy cow?
A. 215
B. 260
C. 280
D. 300
Correct Answer: C. 280 days
1
,Rationale: The average gestation length for dairy cattle (Holstein) is 278–282 days; 280 is the
standard textbook value. Beef cattle average ~283 days. 215 is too short (swine), 260 is equine,
and 300 is buffalo or prolonged bovine.
QUESTION 3
Which of the typical rumen volatile fatty acids normally is present in the greatest quantity in
the rumen?
A. Butyric
B. Propionic
C. Acetic
D. Lactic
Correct Answer: C. Acetic
Rationale: Acetic acid (acetate) accounts for 55–65% of total VFAs in a forage-based diet.
Propionate is ~15–25%, butyrate ~10–15%, and lactic acid is not a typical VFA – it accumulates
only during acidosis.
QUESTION 4
What is the primary site of nutrient absorption in the pig?
A. Stomach
B. Rumen
C. Small intestine
D. Large intestine
Correct Answer: C. Small intestine
Rationale: The jejunum and ileum have extensive villi and microvilli, providing maximum
surface area for absorption of amino acids, glucose, fatty acids, vitamins, and minerals. The
stomach digests, the large intestine absorbs water and electrolytes.
2
,QUESTION 5
Which mineral is the most common macromineral deficiency in grazing ruminants worldwide?
A. Calcium
B. Phosphorus
C. Magnesium
D. Sodium
Correct Answer: B. Phosphorus
Rationale: Phosphorus is often deficient in mature, tropical, or overgrazed forages. It is critical
for bone mineralization, energy metabolism (ATP), and microbial protein synthesis. Calcium is
usually adequate, magnesium causes grass tetany, sodium is often supplemented as salt.
QUESTION 6
The hormone responsible for initiating and maintaining lactation in mammals is:
A. Estrogen
B. Progesterone
C. Prolactin
D. Oxytocin
Correct Answer: C. Prolactin
Rationale: Prolactin from the anterior pituitary is the primary galactopoietic hormone. Estrogen
and progesterone prepare the mammary gland during pregnancy; oxytocin triggers milk
ejection (let‑down), not synthesis.
3
, QUESTION 7
What is the typical crude protein (CP) content of corn silage (dry matter basis)?
A. 4–6%
B. 8–10%
C. 16–18%
D. 22–25%
Correct Answer: B. 8–10%
Rationale: Corn silage averages 8–9% CP on a DM basis. It is a moderate‑protein, high‑energy
(starch) forage. Legume silages (alfalfa) are 18–22%, while cereal grains are 8–12%.
QUESTION 8
In dairy cattle, the dry period is recommended to last approximately:
A. 30 days
B. 45 days
C. 60 days
D. 90 days
Correct Answer: C. 60 days
Rationale: A 60‑day dry period allows mammary tissue involution and repair, and replenishes
body condition. Shorter dry periods reduce subsequent milk yield; longer periods are
uneconomical and may cause obesity.
QUESTION 9
Which of the following is a true stomach in ruminants?
A. Rumen
4
ANSWERS WITH DETAILED RATIONALES EACH | CURRENTLY TESTING
AND FREQUENTLY TESTED QUESTIONS | EXPERT VERIFIED FOR
GUARANTEED PASS | LATEST UPDATE
QUESTION 1
A digestive upset in cattle where large amounts of gas are trapped in the rumen is called?
A. Acidosis
B. Founder
C. Shipping fever
D. Bloat
Correct Answer: D. Bloat
Rationale: Bloat (ruminal tympany) occurs when fermentation gases (primarily CO₂ and
methane) cannot be eructated due to foam or physical obstruction. Acidosis involves lactic acid
buildup, founder is laminitis secondary to acidosis, and shipping fever is a respiratory disease
complex.
QUESTION 2
How many days are in an average gestation period for a dairy cow?
A. 215
B. 260
C. 280
D. 300
Correct Answer: C. 280 days
1
,Rationale: The average gestation length for dairy cattle (Holstein) is 278–282 days; 280 is the
standard textbook value. Beef cattle average ~283 days. 215 is too short (swine), 260 is equine,
and 300 is buffalo or prolonged bovine.
QUESTION 3
Which of the typical rumen volatile fatty acids normally is present in the greatest quantity in
the rumen?
A. Butyric
B. Propionic
C. Acetic
D. Lactic
Correct Answer: C. Acetic
Rationale: Acetic acid (acetate) accounts for 55–65% of total VFAs in a forage-based diet.
Propionate is ~15–25%, butyrate ~10–15%, and lactic acid is not a typical VFA – it accumulates
only during acidosis.
QUESTION 4
What is the primary site of nutrient absorption in the pig?
A. Stomach
B. Rumen
C. Small intestine
D. Large intestine
Correct Answer: C. Small intestine
Rationale: The jejunum and ileum have extensive villi and microvilli, providing maximum
surface area for absorption of amino acids, glucose, fatty acids, vitamins, and minerals. The
stomach digests, the large intestine absorbs water and electrolytes.
2
,QUESTION 5
Which mineral is the most common macromineral deficiency in grazing ruminants worldwide?
A. Calcium
B. Phosphorus
C. Magnesium
D. Sodium
Correct Answer: B. Phosphorus
Rationale: Phosphorus is often deficient in mature, tropical, or overgrazed forages. It is critical
for bone mineralization, energy metabolism (ATP), and microbial protein synthesis. Calcium is
usually adequate, magnesium causes grass tetany, sodium is often supplemented as salt.
QUESTION 6
The hormone responsible for initiating and maintaining lactation in mammals is:
A. Estrogen
B. Progesterone
C. Prolactin
D. Oxytocin
Correct Answer: C. Prolactin
Rationale: Prolactin from the anterior pituitary is the primary galactopoietic hormone. Estrogen
and progesterone prepare the mammary gland during pregnancy; oxytocin triggers milk
ejection (let‑down), not synthesis.
3
, QUESTION 7
What is the typical crude protein (CP) content of corn silage (dry matter basis)?
A. 4–6%
B. 8–10%
C. 16–18%
D. 22–25%
Correct Answer: B. 8–10%
Rationale: Corn silage averages 8–9% CP on a DM basis. It is a moderate‑protein, high‑energy
(starch) forage. Legume silages (alfalfa) are 18–22%, while cereal grains are 8–12%.
QUESTION 8
In dairy cattle, the dry period is recommended to last approximately:
A. 30 days
B. 45 days
C. 60 days
D. 90 days
Correct Answer: C. 60 days
Rationale: A 60‑day dry period allows mammary tissue involution and repair, and replenishes
body condition. Shorter dry periods reduce subsequent milk yield; longer periods are
uneconomical and may cause obesity.
QUESTION 9
Which of the following is a true stomach in ruminants?
A. Rumen
4
