SELECTION PART 1

Question 1

What are the main tools for animal breeder

Answer 1

1. Selection
2. Mating Systems
3. Animal Disposal

Question 2

Decide which animals become parents of the
next generation

Answer 2

Selection

Question 3

Decide which animals are mated to each
other

Answer 3

Mating Systems

Question 4

Remove animals based on current performance (i.e., remove the worst ones, to improve the
current herd).

Answer 4

Animal Disposal

Question 5

The controlling of reproduction of individuals within a population

Answer 5

Selection

Question 6

What are the two types of selection

Answer 6

Natural Selection and Artificial Selection

Question 7

not imposed by man

Answer 7

Natural selecction

Question 8

imposed by man

Answer 8

Artificial Selection

Question 9

What are the two types of natural selection

Answer 9

Absolute selection and Partial Selection

Question 10

What is absolute selection

Answer 10

Lethal phenotypes and sterility

Question 11

What is partial selection

Answer 11

Reduced viability and competition for mates

Question 12

Is artificial selection faster or slower than natural selection

Answer 12

faster than natural selection

Question 13

Why is it important select for a balanced animal when doing artificial selection

Answer 13

Artificial selection can be taken to extremes meaning selection for extremes performance in one trait can result in loss of fitness

Question 14

Why be aware of natural selection?

Answer 14

Animal can be born naturally born with a genetic diseases with the addition of artificial selection that can really harm the animal.
Example: White color desirable for some breeds. but there is a lethal white gene

Question 15

Applied to potential parents to control the genotype of their offsprings

Answer 15

Selection

Question 16

A force to change the FUTURE value of the herd

Answer 16

selection

Question 17

What are future offsprings

Answer 17

heritability and EBV

Question 18

Applied to animal currently in the herd. Not allowing them to have another production cycle

Answer 18

Animal Disposal

Question 19

A force to change the CURRENT value of the herd

Answer 19

Animal Disposal

Question 20

What are the current production

Answer 20

R and MPPA

Question 21

culling for production and economic reasons.

Answer 21

Voluntary culling

Question 22

Are most culling voluntary or involuntary?

Answer 22

involutary

Question 23

Does Culling remove individuals as parents?

Answer 23

Yes

Question 24

What do you look at when you make selections

Answer 24

Look at Breeding value or EPD

Question 25

What do you look at when you make culling decision

Answer 25

MPPA

Question 26

Looks at next production cycle

Answer 26

MPPA

Question 27

Intensity depends on % selected which depends on 3 things

Answer 27

1. Reproductive Rate
2. Generation Interval
3. Number of replacements needed/parents (NR)

Question 28

Explain the relationship between selection animals, selection intensity and selection pressure

Answer 28

Selecting less animals increases the selection intensity, increases selection pressure

Selecting more animals decreases the selection intensity, decreases selection pressure

Question 29

What affects change in genetic response per year

Answer 29

• Heritability and variation
• accuracy of selection
• selection intensity
• generation interval

Question 30

How do we increase genetic response per year

Answer 30

• Increase accuracy of selection
• Increase selection intensity
• Decrease generation interval
• Decrease heritability and variation