Dairy Selection ANSC 698 Presentation

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8 Terms

1
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Good traits to breed for…

  • Udder held high and tight to body

  • Teat size and position

  • Strong feet and legs

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Accuracy of selection

ability to select animals that are superior for a given trait

proportion of animals kept for the next generation and the superiority of those animals compared to genetic average of overall population

3
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Selection intensity

proportion of animals kept for the next generation and the superiority of those animals compared to the genetic average of overall population

4
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Genetic Variation 

Relative differences among animals controlled by genetic factors, this is measured by heritability of the trait

*inbreeding also falls here … no variation 

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Negative traits

  • Stature

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Make sure you…

  • Look at reliability 

  • Check how many daughters 

  • Sort bulls via TPI 

7
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Inbreeding Causes Decreased…

  • Vigor

  • Repro. performance

  • Birth weight

  • Growth and performance

  • Total body size

  • Milk production goes down especially over the lifetime

8
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