American Registry of Professional Animal Scientists (ARPAS) - Beef
Cattle Specialist Exam Practice
1. Which energy system is the most accurate for predicting the performance of
beef cattle by separating energy into maintenance and growth components?
• A. Net Energy (NE)
• B. Metabolizable Energy (ME)
• C. Digestible Energy (DE)
• D. Total Digestible Nutrients (TDN)
Answer: A
Explanation: The Net Energy system (NEm and NEg) is preferred for beef cattle because it
accounts for the heat increment and more accurately predicts energy available for
maintenance and tissue gain compared to DE or ME.
2. What is the average length of the estrous cycle in a beef cow?
• A. 17 days
• B. 21 days
• C. 28 days
• D. 30 days
Answer: B
Explanation: The typical estrous cycle for a beef cow is 21 days, with a range normally
between 18 to 24 days.
3. Which volatile fatty acid (VFA) is the primary precursor for glucose synthesis
in the ruminant liver?
• A. Propionate
• B. Butyrate
• C. Acetate
• D. Lactate
Answer: A
Explanation: Propionate is the major gluconeogenic precursor in ruminants, whereas
acetate is primarily used for lipogenesis.
4. In the calculation of Beef Yield Grades, which of the following measurements
is NOT used?
• A. Ribeye area
• B. Marbling score
, • C. Hot carcass weight
• D. Fat thickness over the ribeye
Answer: B
Explanation: Marbling score is used to determine Quality Grade, not Yield Grade. Yield
Grade is determined by fat thickness, ribeye area, KPH fat, and hot carcass weight.
5. What is the approximate gestation length for beef cattle?
• A. 250 days
• B. 305 days
• C. 283 days
• D. 336 days
Answer: C
Explanation: The average gestation period for beef cattle is approximately 283 days,
though it can vary by breed (e.g., Brahman influences usually have longer gestations).
6. Which mineral deficiency is most commonly associated with ‘Grass Tetany’ in
cattle grazing lush spring pastures?
• A. Calcium
• B. Magnesium
• C. Phosphorus
• D. Selenium
Answer: B
Explanation: Grass tetany is caused by hypomagnesemia, often resulting from low
magnesium intake or high potassium levels interfering with magnesium absorption.
7. An Expected Progeny Difference (EPD) with a high ‘Accuracy’ value (closer to
1.0) indicates what?
• A. The animal is superior to all others in the breed.
• B. The trait is highly heritable.
• C. The animal’s progeny will have no variation in performance.
• D. There is a high level of confidence that the EPD will not change significantly as
more data is collected.
Answer: D
Explanation: Accuracy in EPDs reflects the amount of data (progeny records) available;
higher accuracy means the EPD value is less likely to change significantly with more
information.
Cattle Specialist Exam Practice
1. Which energy system is the most accurate for predicting the performance of
beef cattle by separating energy into maintenance and growth components?
• A. Net Energy (NE)
• B. Metabolizable Energy (ME)
• C. Digestible Energy (DE)
• D. Total Digestible Nutrients (TDN)
Answer: A
Explanation: The Net Energy system (NEm and NEg) is preferred for beef cattle because it
accounts for the heat increment and more accurately predicts energy available for
maintenance and tissue gain compared to DE or ME.
2. What is the average length of the estrous cycle in a beef cow?
• A. 17 days
• B. 21 days
• C. 28 days
• D. 30 days
Answer: B
Explanation: The typical estrous cycle for a beef cow is 21 days, with a range normally
between 18 to 24 days.
3. Which volatile fatty acid (VFA) is the primary precursor for glucose synthesis
in the ruminant liver?
• A. Propionate
• B. Butyrate
• C. Acetate
• D. Lactate
Answer: A
Explanation: Propionate is the major gluconeogenic precursor in ruminants, whereas
acetate is primarily used for lipogenesis.
4. In the calculation of Beef Yield Grades, which of the following measurements
is NOT used?
• A. Ribeye area
• B. Marbling score
, • C. Hot carcass weight
• D. Fat thickness over the ribeye
Answer: B
Explanation: Marbling score is used to determine Quality Grade, not Yield Grade. Yield
Grade is determined by fat thickness, ribeye area, KPH fat, and hot carcass weight.
5. What is the approximate gestation length for beef cattle?
• A. 250 days
• B. 305 days
• C. 283 days
• D. 336 days
Answer: C
Explanation: The average gestation period for beef cattle is approximately 283 days,
though it can vary by breed (e.g., Brahman influences usually have longer gestations).
6. Which mineral deficiency is most commonly associated with ‘Grass Tetany’ in
cattle grazing lush spring pastures?
• A. Calcium
• B. Magnesium
• C. Phosphorus
• D. Selenium
Answer: B
Explanation: Grass tetany is caused by hypomagnesemia, often resulting from low
magnesium intake or high potassium levels interfering with magnesium absorption.
7. An Expected Progeny Difference (EPD) with a high ‘Accuracy’ value (closer to
1.0) indicates what?
• A. The animal is superior to all others in the breed.
• B. The trait is highly heritable.
• C. The animal’s progeny will have no variation in performance.
• D. There is a high level of confidence that the EPD will not change significantly as
more data is collected.
Answer: D
Explanation: Accuracy in EPDs reflects the amount of data (progeny records) available;
higher accuracy means the EPD value is less likely to change significantly with more
information.
