Genetics and Crossbreeding in Commercial Livestock Production
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Questions and Answers

What contributes to the genetic differences among offspring of the same parents?

  • Number of chromosomes in the sperm cells
  • Genetic correlation among traits
  • Heritability
  • Recombination upon fertilization (correct)
  • Which factor affects the rate of genetic improvement from selection?

  • Selection differential (correct)
  • Mothering ability
  • Generation interval
  • Weaning weight
  • What does EPD stand for in the context of cattle breeding?

  • Effective Parental Dominance
  • Estimated Performance Data
  • Expected Progeny Differences (correct)
  • Extra Progeny Development
  • Which of the following affects the genetic merit of offspring according to the text?

    <p>Proportion of desirable genes in reproductive cells</p> Signup and view all the answers

    What is one of the factors that affect the rate of improvement from selection?

    <p>Calving ease EPDs</p> Signup and view all the answers

    Why can some individuals be genetically superior to the average of their parents?

    <p>Due to recombination upon fertilization</p> Signup and view all the answers

    What method should a commercial producer use to improve traits with medium to high heritability?

    <p>Purchasing bulls from a purebred producer</p> Signup and view all the answers

    Which of the following is a result of genes favorable for one trait being either favorable or unfavorable for another trait?

    <p>Genetic association</p> Signup and view all the answers

    What effect does a positive genetic association between traits such as birth weight, pre-weaning gain, and post-weaning gain have on selection?

    <p>Results in an increase in other associated traits when one is improved</p> Signup and view all the answers

    How can the rate of progress be increased in beef cattle herds?

    <p>Vigorous culling of the cow herd based on production</p> Signup and view all the answers

    What impact does a shortened generation interval have on the rate of genetic improvement?

    <p>Increases the rate of genetic improvement</p> Signup and view all the answers

    Why should a commercial producer use crossbreeding for traits low in heritability?

    <p>To benefit from genetic diversification</p> Signup and view all the answers

    What is the purpose of using EPDs in the context of the text?

    <p>To correct potential pedigree errors and increase the accuracy of EPDs.</p> Signup and view all the answers

    Which companies provide genomic performance testing as mentioned in the text?

    <p>Zoetis and Neogen.</p> Signup and view all the answers

    What is a common reason for genomic defect testing as highlighted in the text?

    <p>Detecting genetic defects like curly calf syndrome.</p> Signup and view all the answers

    How does genomic testing help ensure accurate EPDs for young sires?

    <p>By increasing the confidence of EPDs through genetic markers.</p> Signup and view all the answers

    What is a key responsibility of purebred breeders and commercial cattle producers according to the text?

    <p>Improving production efficiency through genetic selection.</p> Signup and view all the answers

    Why should purebred breeders and commercial cattle producers have a working knowledge of genetics?

    <p>To make informed decisions on matings and breeding stock.</p> Signup and view all the answers

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