EXAM EBV PART 1

Question 1

Correlations between the True BV and the Estimated BV

Answer 1

Accuracy

Question 2

More information in the Estimated Breeding Value, increases or decreases accuracy

Answer 2

Increase accuracy

Question 3

Does Accuracy/reliability show how good the animal is?

Answer 3

No, it gives us how good our estimate is

Question 4

Shows which animals are the best

Answer 4

Breeding value

Question 5

Decision factor

Answer 5

Breeding value

Question 6

Risk management

Answer 6

Accuracy/Reliability

Question 7

Intensity factor

Answer 7

Accuracy/Reliability

Question 8

Breeding value and Accuracy are independent or dependent

Answer 8

independent

Question 9

Qualitative Traits - Accuracy

Answer 9

Can be very accurate

Question 10

Problems Qualitative Traits - Accuracy

Answer 10

Carrier of recessives

Question 11

Quantitative Traits - Accuracy

Answer 11

Large number of loci, plus environment

Question 12

Genotype is never truly known

Answer 12

Quantitative Traits - Accuracy

Question 13

The approach to improve the traits is the same (3 things):

Answer 13

1. Estimate the genotypes of potential breeders
2. Select animals with the desired genotypes
3. Mate to produce offspring

Question 14

Every animal has a WHAT for every trait of the species

Answer 14

True BV

Question 15

What is constant True BV or EBV

Answer 15

True BV

Question 16

What changes as we get more performance information

Answer 16

EBV

Question 17

How to get the highest breeding value in an animal?

Answer 17

Measure the animal itself to get the highest breeding value

Question 18

The best single source of information about an animals’ genotype is its own phenotype

Answer 18

Measure highest breeding value

Question 19

What you are losing

Answer 19

Relative accuracy

Question 20

Should you use single low accuracy animal

Answer 20

Not recommended

Question 21

What should you do if you invest in low accuracy animal

Answer 21

if invest low accuracy animal, invest in a lot of animal just in case the one of the animal is good

Question 22

When is Accuracy lower

Answer 22

When you have an environmental resemblance among the animals with records.

Question 23

Is it easier or harder to separate the common environment from the genetics, when accuracy is lower

Answer 23

Harder to separate the common environment from the genetics

Question 24

What is c^2

Answer 24

Common environment of family

Question 25

What affects c^2

Answer 25

1. Resemblance within a group
2. Number of groups the progeny are in
3. How are they split among groups
4. Uniformity between groups

Question 26

What creates a smaller c^2 and high accuracy

Answer 26

MORE COMTEMPORARY GROUPS → smaller c2 → higher accuracy

Question 27

If you have multiple source, what do you need to measure

Answer 27

weight of the animal

Question 28

What impacts price in the market? (2 things)

Answer 28

Higher EBV
Higher accuracy

Question 29

How can we manipulate accuracy?
RYX - relationship with offsprings

Answer 29

WANT IT HIGH

Question 30

How can we manipulate accuracy?
RXX - multiple relatives (full sibs 0.5 or half sibs 0.25)

Answer 30

WANT IT LOW

Question 31

How can we manipulate accuracy?
N = number of records/animals

Answer 31

WANT IT HIGH

Question 32

How can we manipulate accuracy?
A = number of relatives

Answer 32

WANT IT HIGH

Question 33

How can we manipulate accuracy?
c2 = common environment

Answer 33

WANT IT LOW

Question 34

What is the cost of getting more information relatives to the increased accuracy

Answer 34

More records= More time and more cost of measurements