Question 1

Which of the following is the primary focus of a dairy farmer to ensure both animal welfare and farm profitability?

Accepted Answer

Providing clean, comfortable cows with plenty of food and water

Question 2

Which dairy breed is known for the highest average milk production per lactation and makes up about 90% of the U.S. dairy cow population?

Accepted Answer

Holstein

Question 3

A dairy cow is producing milk with a golden color due to high beta-carotene content. Which breed is most likely responsible for this milk?

Accepted Answer

Guernsey

Question 4

Which compartment of the ruminant stomach is primarily responsible for water absorption?

Accepted Answer

Omasum

Question 5

A farmer finds a nail in a cow’s stomach during a veterinary exam. In which compartment is this most likely to be found, and what disease can it cause?

Accepted Answer

Reticulum; Hardware Disease

Question 6

Which of the following is NOT a volatile fatty acid (VFA) produced during ruminal fermentation?

Accepted Answer

Lactic acid

Question 7

Why is water considered the most important nutrient for dairy cows, and how much do they typically require per day?

Accepted Answer

It is essential for milk synthesis; 30-50 gallons/day

Question 8

Which milking parlor design allows cows to stand side by side, maximizing the number of cows milked at once?

Accepted Answer

Parallel Parlor

Question 9

A dairy farm is experiencing high somatic cell counts and frequent mastitis cases. Which management practice should be prioritized to address these issues?

Accepted Answer

Improve cow hygiene and milking procedures

Question 10

Which of the following best describes the symbiotic relationship between ruminant animals and their rumen micro-organisms?

Accepted Answer

Cows provide a habitat and food for micro-organisms, which in turn break down cellulose into usable nutrients

Question 11

Which breed of dairy cow is considered dual-purpose, being used for both dairy and beef production?

Accepted Answer

Milking Shorthorn

Question 12

A dairy cow is observed regurgitating and rechewing its feed. What is this process called, and why is it important?

Accepted Answer

Rumination; it reduces feed particle size and aids digestion

Question 13

Which ligament is most important for supporting the udder and is extremely strong?

Accepted Answer

Median suspensory ligament

Question 14

Which of the following best explains why ruminants can utilize forages that non-ruminants cannot?

Accepted Answer

Ruminants host micro-organisms that ferment cellulose into usable nutrients

Question 15

A dairy cow is producing milk with a high fat and protein percentage, ideal for ice cream and cheese production. Which breed is most likely responsible?

Accepted Answer

Jersey

Question 16

Which state produces the largest share of the U.S. milk supply?

Accepted Answer

California

Question 17

Which of the following is a correct sequence for the compartments of a ruminant stomach?

Accepted Answer

Rumen, Reticulum, Omasum, Abomasum

Question 18

A dairy farm is considering switching from pasture-based to freestall housing. Which of the following is a likely benefit of freestall housing?

Accepted Answer

Improved cow hygiene and production control

Question 19

Which of the following is a main end-product of ruminal fermentation and the primary energy source for dairy cows?

Accepted Answer

Volatile Fatty Acids (VFAs)

Question 20

A dairy cow is diagnosed with a thiamine deficiency and is showing signs of blindness. Which process in the rumen is most likely disrupted?

Accepted Answer

Microbial synthesis of B-vitamins

Introduction to Dairy Science: Dairy Cattle, Production, and Management

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