ANSC 4395 Breeding and Genetics
Exam 4
Results of selection are... - -predictable in magnitude and direction
but prediction is only as good as the information
-Response to Selection - -is the genetic change that occurs as a result of
selection
must take into consideration environment
-Response is the function of what? - -heritability and the selection
differential
-Selection Differential - -is the difference between the mean performance of
the selected individuals and the average of the entire herd
-Generation internal - -the length of time it takes to replace members of 1
generation in a herd
symbol= L
the average age of the parents when any offspring is born
-Breeding Value - -An individual's phenotype is the result of its genetic
merit and the effect of the environment
-Genetic merit is also called - -Breeding Value
-An individual receives half of its genetic make up from both parents - -
Expected BV= 1/2 sire+ 1/2 dam
-Estimated Breeding Value - -- actual breeding value of an individual is
never known
- can be estimated from an individuals performance and the performance of
its relatives
the clser relationship the better the estimates
-progeny, full sibs, half sibs, grand parents
-When it comes to EBV.. - -an additional information that can be obtained
will always increase EBV
-Accuracy - -is the confidence
-correlation between the true bv and the EBV
- will always be between 0-1 but never exactly 1 or 0
- the higher the better
Exam 4
Results of selection are... - -predictable in magnitude and direction
but prediction is only as good as the information
-Response to Selection - -is the genetic change that occurs as a result of
selection
must take into consideration environment
-Response is the function of what? - -heritability and the selection
differential
-Selection Differential - -is the difference between the mean performance of
the selected individuals and the average of the entire herd
-Generation internal - -the length of time it takes to replace members of 1
generation in a herd
symbol= L
the average age of the parents when any offspring is born
-Breeding Value - -An individual's phenotype is the result of its genetic
merit and the effect of the environment
-Genetic merit is also called - -Breeding Value
-An individual receives half of its genetic make up from both parents - -
Expected BV= 1/2 sire+ 1/2 dam
-Estimated Breeding Value - -- actual breeding value of an individual is
never known
- can be estimated from an individuals performance and the performance of
its relatives
the clser relationship the better the estimates
-progeny, full sibs, half sibs, grand parents
-When it comes to EBV.. - -an additional information that can be obtained
will always increase EBV
-Accuracy - -is the confidence
-correlation between the true bv and the EBV
- will always be between 0-1 but never exactly 1 or 0
- the higher the better
