American Registry of Professional Animal Scientists
(ARPAS) - Beef Cattle Specialist Exam Practice and
Correct Answers
1. What is the standard multiplier used to convert nitrogen content to crude
protein in beef cattle nutrition?
• A. 6.25
• B. 5.25
• C. 7.25
• D. 4.25
Answer: A
Explanation: The standard nitrogen-to-protein conversion factor is 6.25, based on the
assumption that proteins contain approximately 16% nitrogen.
2. In the Net Energy system, which energy value is typically the lowest for a
given feedstuff?
• A. Net Energy for Maintenance (NEm)
• B. Metabolizable Energy (ME)
• C. Gross Energy (GE)
• D. Digestible Energy (DE)
• E. Net Energy for Gain (NEg)
Answer: E
Explanation: NEg is always lower than NEm for the same feed because the efficiency of
energy use for tissue gain is lower than for maintenance.
3. Which compartment of the ruminant stomach is known as the ‘honeycomb’
and is responsible for trapping foreign objects?
• A. Reticulum
• B. Omasum
• C. Abomasum
• D. Rumen
Answer: A
Explanation: The reticulum has a honeycomb-like lining and is the site where heavy or
dense metal objects (like hardware) settle.
, 4. What is the average length of the estrous cycle in a non-pregnant beef cow?
• A. 17 days
• B. 28 days
• C. 21 days
• D. 14 days
Answer: C
Explanation: While there is a range (18-24 days), the standard average estrous cycle for
cattle is 21 days.
5. Which hormone is produced by the Corpus Luteum (CL) and is essential for
maintaining pregnancy?
• A. Estrogen
• B. Progesterone
• C. Prostaglandin F2-alpha
• D. Luteinizing Hormone
Answer: B
Explanation: Progesterone, the ‘hormone of pregnancy,’ is secreted by the CL to prepare
the uterus and maintain the pregnancy.
6. Which mineral deficiency is most commonly associated with ‘Grass Tetany’ in
cattle grazing lush spring pastures?
• A. Calcium
• B. Phosphorus
• C. Magnesium
• D. Selenium
Answer: C
Explanation: Grass tetany is caused by hypomagnesemia, often triggered by low
magnesium levels in rapidly growing forages.
7. What does the acronym ‘EPD’ stand for in beef cattle genetics?
• A. Estimated Progeny Difference
• B. Evaluated Parentage Data
• C. Enhanced Phenotypic Distribution
• D. Expected Progeny Difference
Answer: D
Explanation: EPD stands for Expected Progeny Difference, providing a prediction of how
future progeny of each animal are expected to perform compared to others in the same
database.
(ARPAS) - Beef Cattle Specialist Exam Practice and
Correct Answers
1. What is the standard multiplier used to convert nitrogen content to crude
protein in beef cattle nutrition?
• A. 6.25
• B. 5.25
• C. 7.25
• D. 4.25
Answer: A
Explanation: The standard nitrogen-to-protein conversion factor is 6.25, based on the
assumption that proteins contain approximately 16% nitrogen.
2. In the Net Energy system, which energy value is typically the lowest for a
given feedstuff?
• A. Net Energy for Maintenance (NEm)
• B. Metabolizable Energy (ME)
• C. Gross Energy (GE)
• D. Digestible Energy (DE)
• E. Net Energy for Gain (NEg)
Answer: E
Explanation: NEg is always lower than NEm for the same feed because the efficiency of
energy use for tissue gain is lower than for maintenance.
3. Which compartment of the ruminant stomach is known as the ‘honeycomb’
and is responsible for trapping foreign objects?
• A. Reticulum
• B. Omasum
• C. Abomasum
• D. Rumen
Answer: A
Explanation: The reticulum has a honeycomb-like lining and is the site where heavy or
dense metal objects (like hardware) settle.
, 4. What is the average length of the estrous cycle in a non-pregnant beef cow?
• A. 17 days
• B. 28 days
• C. 21 days
• D. 14 days
Answer: C
Explanation: While there is a range (18-24 days), the standard average estrous cycle for
cattle is 21 days.
5. Which hormone is produced by the Corpus Luteum (CL) and is essential for
maintaining pregnancy?
• A. Estrogen
• B. Progesterone
• C. Prostaglandin F2-alpha
• D. Luteinizing Hormone
Answer: B
Explanation: Progesterone, the ‘hormone of pregnancy,’ is secreted by the CL to prepare
the uterus and maintain the pregnancy.
6. Which mineral deficiency is most commonly associated with ‘Grass Tetany’ in
cattle grazing lush spring pastures?
• A. Calcium
• B. Phosphorus
• C. Magnesium
• D. Selenium
Answer: C
Explanation: Grass tetany is caused by hypomagnesemia, often triggered by low
magnesium levels in rapidly growing forages.
7. What does the acronym ‘EPD’ stand for in beef cattle genetics?
• A. Estimated Progeny Difference
• B. Evaluated Parentage Data
• C. Enhanced Phenotypic Distribution
• D. Expected Progeny Difference
Answer: D
Explanation: EPD stands for Expected Progeny Difference, providing a prediction of how
future progeny of each animal are expected to perform compared to others in the same
database.
