EBV PART 2 Flashcards
Why measure traits x to measure a breeding value for trait y
Cheaper and faster and early in life for the other one
If the heritability you measure is higher than the breeding value
Why would traits be genetically correlated, 2 reason
Linkage
Pleiotropy
genes are inherited together
Linkage
same genes affect multiple traits
Pleiotropy
NOT cause and effect
Linkage
linked to economic trait
Marker gene
What is BLUP
Best Linear Unbiased Prediction
allows us to consider all animals in the dataset simultaneously
Animal models
What is the result of using BLUP and Animal Model
Estimate genetic and environmental trends over time
Progeny in more than one herd
Use of Reference Sires
T or F - EBVs for all animals can be directly compared
True
Group of animal that push breeding value to 0
Genetic Base
What are the types of genetic base
Moving base
Fixed Base
the base changes with each analysis
Moving base
a set point that doesn’t change
Fixed Base
What are the three main types of EPD used in evaluation
PARENT EPD
NON PARENT EPD
PEDIGREE EPD
sires and dams (they have progeny with data)
Parent EPD
Has own record, no progeny
Non parent EPD
no record itself; average of parent EPDs
Pedigree EPD
Possible Change to the accuracy depends on the variance of the trait’s what
Confidence Range
Standard Error of the EPD
Consequence of being wrong
Risk
How do you absorb risk
Use of large herds can absorb risk better
Common questions about genetic evaluations
- What does +15 lbs mean?
- Why do EPDs change?
- What is the average EPD?
- How high an accuracy do I need?
