Animal Breeding Pretest

Using phenotypic selection will not in result genetic change

False

Which of the values below benefit most from dominance?

GCV (Gene Combination Value)

As generation interval increases, rate of genetic change increases

False

A dairy producer wants to start estimate Producing Ability (MPPA) for milk production for each individual cow in his herd? At a minimum what are 2 pieces of info he will need to do that

repeatability; the number of records and the average milk production over the records

Correlations can be used to predict the expectd chamge in one variable (Y) based per unit change in another (X)

false

Which of the following best represents lowly heritable traits?

reproduction and fitness

The accuracy (ACC) of using individual data to estimate breeding value for weaning weight in Boer goats is 0.50. Which of the following is true concerning heritability of weaning weight in this population?

heritability= 0.25

High levels of accuracy are possible for highly heritable traits just from individual phenotypic data alone?

true

Which of the following should be used to fill in the missing varible

covariance

When heritability is high; accuract is also expected to be high

true

1) Who is expected to produce the most milk on the next lactation? (spell like it is written in the table)

2) How much more will she produce compared to the other cow?

blank 1 = Dearie; blank 2 = 10

Genetic correlations can be used to help make genetic predictions using BLUP

true

Which of the following will increase the rate of genetic change? (select all)

predict breeding values using EPDs instead of phenotypes; use artifical insemination in order use the best sires; adjusting records to account for environmental effects

A heritability estimate of 0.15 can be classified as a moderate heritability

true

Heritability is a regression coefficient that can be used to calculate Breeding Value based on individual phenotypic info but not progeny info

false

Repeatability is at a minimum equal to or often higher than heritability

true

Typically rate of genetic change in a population is largely due to the sire (>80%) and females contribute less

true

The following is Winnie's genetic and environmental components for her current lactation. The average for the population was 20,000 lbs of milk. True or False Winnie's high non-additive value (NAV) is due to her heterozygous genotype

true

[use table] 1)Wh is expected to produce daughters for greater milking ability when mated to the same bulls?

2)How many much more milk compared to the other cow's daughters?

blank 1 = Sweetie; blank 2 = 15

A correlation between repeated measure taken on a single individual

repeatability

Which of the following is not included in the rate of genetic change equation?

of animals; source

Harold is a Jersey bull that has a breeding value of +1000 lbs for milk production in a herd that averages 15,000 lbs. When Harold is mated to Elsie who has a breeding value of +3000 lbs for milk production what would we expect their progeny to produce in milk production?

17,000 lbs

What percentage (approximately) of the population falls below -2 standards of deviations from the mean?

2.5%

The heritability of # of toes on each foot is equal to 1.0 because everyone has the same number and it is completely determined by geneics.

false

Progeny data is the best way to improve genetic predictions (make more accurate) involving lowly heritable traits

true

The more genetic uniformity, the more one can increase the rate of genetic change

false

Which of the following would likely provide the most accurate estimate for EBV for a lowly heritable trait?

single records on 10 progeny

Variance can be both a positive number and a negative number

false

A producer wants to use backfat measurements to predict marbling. What should be used to fill in the blank?

variance

Heritability contributes to accuracy in the rate of genetic change equation

true

Who has the biggest circumference at a year of age?

Willie because ha has the same Genotypic Value but a larger Environmental Effect than Bevo

Which of the following genetc model components that contribute to overall performance are estimated by EPD's?

Breeding Value

Roach (a cat) has the genotype AABbCc for mousing ability and each locus is under the influence of complete dominance. (A= +10; a= -10 and so on) What is the Breeding Value for Roach?

+20p

Which of the following can be used in the estimation of Breeding Values? (select all that apply)

progeny data; parents

In a large survey of house cat body weights in Iowa, the following was reported: Avg weight= 10 lbs; Standard deviation= 1 lbs

Based on the data, 94% of the population of house cats living in Iowa weighs 9 lbs or greater

false

Breeding Value= __________ x Progeny Difference

2

Heritability estimates can become higher by creating more uniform environments

true

1) Who is expected to produce the daughters for greater milking ability? [see table]

2) How much more than the other cow's daughters when mated to the same bull?

1) Sweetie

2) 15

The change in producing ability due to a unit change in phenotype

repeatability

On average, who is more likely to sire calves with the largest scrotal circumference?

Bevo because he has the larger Breeding Value

The statistical methodology used for estimating breeding values in large scale evaluations is known as

Best Linear Unbiased Prediction (BLUP)

Accurcay is a measure of the strength of the relationship of our predicted EPD value with the actual "true" breeding value

true