ANSC 4084- Exam 2: Beef EPDs EXAM
LATEST 2023-2024 ACTUAL EXAM QUESTIONS
AND CORRECT ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+
what are expected progeny differences? - CORRECT ANSWER
- are a measure of the expected differences in performance of a
sire's/dam's progeny when compared to the average progeny of
all sires/dams evaluated within the same breed
what is the EPD prediction based on? - CORRECT ANSWER -
actual performance, progeny performance, and relatives'
performance
what do EPD represent? - CORRECT ANSWER - the average
transmitting ability of an individual for a trait expressed in the units
of measure for the trait
- it is the estimate of the breeding value or true genetic merit of an
animal
example: - CORRECT ANSWER - A bull with a +30 lb weaning
weight EPD would be expected to produce calves 30 lbs. heavier
at weaning than the base bull (0 EPD) for the breed.
A bull with a +30 lb weaning weight EPD would be expected to
produce calves 30 lbs. heavier at weaning than the base bull (0
EPD) for the breed.
what do expected progeny differences allow? - CORRECT
ANSWER - direct comparisons of the expected performance of
the progeny from bulls and cows
does a new born hereford calf have EPD's? - CORRECT
ANSWER - The bull A with a +30 lb WW EPD would be
expected to produce calves 10 lbs. heavier at weaning than bull B
with a 20 lb WW EPD.
- the average EPD for any trait is not zero
- Bull A with the +30 lb WW EPD is not going to produce calves
30 pounds heavier than the average of the breed.
- Bull A will produce calves 30 lbs. heavier than the base animal.
- However, this still allows for direct comparisons in actual units of
the trait.
look at slide 6 for - CORRECT ANSWER - breed average EPD
value
what are EPD's based on? - CORRECT ANSWER - the
performance information submitted to breed associations
how is EPD data analyzed? - CORRECT ANSWER - by
sophisticated computer programs that make comparisons of
performance of animals within each herd and across the breed to
calculate an estimate of the breeding value of each individual
remember: - CORRECT ANSWER - the sum of all of the genes
that have an additive effect on a trait is termed the animals
breeding value for that trait
in making the EPD calculation what does the program consider? -
CORRECT ANSWER - the performance of relative in other
herds compared to their contemporaries
- so, the reliability of this estimate of the breeding value in
predicting the true breeding is a function of the amount of data
submitted to the breed associated and the accuracy of the dat
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