EXAM EBV PART 1 Flashcards
Correlations between the True BV and the Estimated BV
Accuracy
More information in the Estimated Breeding Value, increases or decreases accuracy
Increase accuracy
Does Accuracy/reliability show how good the animal is?
No, it gives us how good our estimate is
Shows which animals are the best
Breeding value
Decision factor
Breeding value
Risk management
Accuracy/Reliability
Intensity factor
Accuracy/Reliability
Breeding value and Accuracy are independent or dependent
independent
Qualitative Traits - Accuracy
Can be very accurate
Problems Qualitative Traits - Accuracy
Carrier of recessives
Quantitative Traits - Accuracy
Large number of loci, plus environment
Genotype is never truly known
Quantitative Traits - Accuracy
The approach to improve the traits is the same (3 things):
- Estimate the genotypes of potential breeders
- Select animals with the desired genotypes
- Mate to produce offspring
Every animal has a WHAT for every trait of the species
True BV
What is constant True BV or EBV
True BV
What changes as we get more performance information
EBV
How to get the highest breeding value in an animal?
Measure the animal itself to get the highest breeding value
The best single source of information about an animals’ genotype is its own phenotype
Measure highest breeding value
What you are losing
Relative accuracy
Should you use single low accuracy animal
Not recommended
What should you do if you invest in low accuracy animal
if invest low accuracy animal, invest in a lot of animal just in case the one of the animal is good
When is Accuracy lower
When you have an environmental resemblance among the animals with records.
Is it easier or harder to separate the common environment from the genetics, when accuracy is lower
Harder to separate the common environment from the genetics
What is c^2
Common environment of family
What affects c^2
- Resemblance within a group
- Number of groups the progeny are in
- How are they split among groups
- Uniformity between groups
What creates a smaller c^2 and high accuracy
MORE COMTEMPORARY GROUPS → smaller c2 → higher accuracy
If you have multiple source, what do you need to measure
weight of the animal
What impacts price in the market? (2 things)
Higher EBV
Higher accuracy
How can we manipulate accuracy?
RYX - relationship with offsprings
WANT IT HIGH
How can we manipulate accuracy?
RXX - multiple relatives (full sibs 0.5 or half sibs 0.25)
WANT IT LOW
How can we manipulate accuracy?
N = number of records/animals
WANT IT HIGH
How can we manipulate accuracy?
A = number of relatives
WANT IT HIGH
How can we manipulate accuracy?
c2 = common environment
WANT IT LOW
What is the cost of getting more information relatives to the increased accuracy
More records= More time and more cost of measurements
