Animal Breeding and Genetics
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Questions and Answers

What proportion of differences between individuals is attributed to variations in their genetic makeup?

  • Half
  • Almost all
  • A quarter (correct)
  • Three-quarters

    • What is the average milk production of Holstein cows per season?

  • 3500 kg
  • 2500 kg
  • 6000 kg
  • 5000 kg (correct)

    • What happens to the milk yield of an animal if it is calved for the first time at an age younger than appropriate for its species?

  • It increases in the first season and subsequent seasons
  • It remains the same
  • It decreases in the first season and subsequent seasons (correct)
  • It increases only in the first season

    • Why does the nutrition of an animal at a young age not allow for the accumulation of effort and energy for milk production?

    <p>It is limited and insufficient to meet growth and fetal nutrition needs</p> Signup and view all the answers

    What is the primary reason for the focus on specific environmental factors in the study of milk yield?

    <p>Comprehensive knowledge of all environmental components is impractical</p> Signup and view all the answers

    What is the approximate milk production of local cows per season?

    <p>1200 kg</p> Signup and view all the answers

    What is the typical duration of the lactation season when milk secretion reaches its peak?

    <p>4-6 weeks</p> Signup and view all the answers

    What trait influences milk production by maintaining the highest daily milk yield for the longest duration?

    <p>Perseverance</p> Signup and view all the answers

    What is the benefit of cows being able to feed on forage materials without concentrated feed?

    <p>Reduced production costs</p> Signup and view all the answers

    What is the effect of increasing the calving interval on milk yield per season?

    <p>It increases</p> Signup and view all the answers

    What is the result of reducing the calving interval in European cattle?

    <p>A significant decrease in milk yield</p> Signup and view all the answers

    What is correlated with the duration of lactation?

    <p>Milk production</p> Signup and view all the answers

    What is the main reason why milking multiple times a day is not always adopted?

    <p>It is largely dependent on labor costs and the potential increase in milk yield</p> Signup and view all the answers

    What is the effect of increasing the frequency of milking on blood vessels and secretory cells in the udder?

    <p>It reduces pressure on blood vessels and secretory cells</p> Signup and view all the answers

    A cow is currently being milked 4 times a day. If the milking frequency is reduced to 3 times a day, what is the expected effect on milk yield?

    <p>It will decrease by 13%</p> Signup and view all the answers

    What is the effect of a longer interval between morning and evening milkings on milk yield?

    <p>It results in a significantly higher quantity of milk in the morning</p> Signup and view all the answers

    What is secreted by cows immediately after birth, and how long does it last?

    <p>Colostrum, lasts for 3-4 days</p> Signup and view all the answers

    If a cow is currently being milked 3 times a day and the milking frequency is increased to 4 times a day, what is the expected effect on milk yield?

    <p>It will increase by 13%</p> Signup and view all the answers

    What is the primary reason for the decrease in milk production during pregnancy?

    <p>Increase in the fetus's needs</p> Signup and view all the answers

    What is the average range of the service and gestation period in native dairy cattle?

    <p>2 to 3 months</p> Signup and view all the answers

    What is the calving interval in Egyptian cattle?

    <p>420 days</p> Signup and view all the answers

    What is the effect of reducing the service and gestation period by 85 days?

    <p>Decrease in milk yield</p> Signup and view all the answers

    What percentage decrease in milk production do cows with 8-month-old fetuses experience?

    <p>20%</p> Signup and view all the answers

    What is the relationship between the insemination period and milk yield in Egyptian cattle and buffalo?

    <p>Milk yield increases with an increase in the insemination period</p> Signup and view all the answers

    What is the insemination period in Egyptian buffalo?

    <p>177 days</p> Signup and view all the answers

    What is the primary factor affecting milk production in dairy cattle?

    <p>Nutrition</p> Signup and view all the answers

    What percentage of milk yield is obtained when dairy cattle are fed solely on roughage?

    <p>75-87%</p> Signup and view all the answers

    What is the ideal ratio of concentrated feeds to roughage in the diet?

    <p>40-60%</p> Signup and view all the answers

    What is the minimum proportion of concentrated feeds in the diet required for optimal milk production?

    <p>30%</p> Signup and view all the answers

    What is the result of feeding Friesian and Jersey cows on concentrates along with roughage?

    <p>Increase in milk production</p> Signup and view all the answers

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