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ANSC 4084- Exam 2_ Beef EPDs WITH COMPLETE SOLUTIONS GRADED A+
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10/31/24, 6:01 PM ANSC 4084- Exam 2: Beef EPDs Flashcards | QuizletANSC 4084- Exam 2: Beef EPDsWITH COMPLETE
SOLUTIONS GRADED A+
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Terms in this set (51)
- are a measure of the expected differences in performance of a sire's/dam's
what are expected progeny differences? progeny when compared to the average progeny of all sires/dams evaluated within
the same breed
what is the EPD prediction based on? - actual performance, progeny performance, and relatives' performance
- the average transmitting ability of an individual for a trait expressed in the units of
what do EPD represent? measure for the trait
- it is the estimate of the breeding value or true genetic merit of an animal
- 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.
example:
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 - direct comparisons of the expected performance of the progeny from bulls and
allow? cows
- 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
does a new born hereford calf have EPD's? - 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 - breed average EPD value
what are EPD's based on? - the performance information submitted to breed associations
- by sophisticated computer programs that make comparisons of performance of
how is EPD data analyzed? animals within each herd and across the breed to calculate an estimate of the
breeding value of each individual
- the sum of all of the genes that have an additive effect on a trait is termed the
remember:
animals breeding value for that trait
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, 10/31/24, 6:01 PM ANSC 4084- Exam 2: Beef EPDs Flashcards | Quizlet
- the performance of relative in other herds compared to their contemporaries
in making the EPD calculation what does - so, the reliability of this estimate of the breeding value in predicting the true
the program consider? breeding is a function of the amount of data submitted to the breed associated and
the accuracy of the data
- the calf's performance in the herd compared to his contemporaries will be
considered as well as the EPD of his ancestors
calculating the EPD for this calf following
- EPD's are continually recalculated as more and more information is available
weaning:
- remember: this calf is only compared to his contemporary group (calves raised in
the same environment)
how reliable are EPD's in predicting - EPD have had significant influence on beef breeding, they are not perfect in
breeding value? predicting the true genetic merit of an individual animal
- WW EPD calculated for a bull calf at birth. The EPD for WW will initially be the
average of his parent's WW EPD. Since we don't know which sampling of gametes
the calf received for each trait, some traits may be better
why are there inaccuracies in EPD's?
than average and some maybe poorer than average.
- This gene segregation causes the EPD on unproven animals
to be inaccurate in many ways.
what is the accuracy value for an EPD? - is the reliability that can be placed on the EPD
- 0 to 1.0 with accuracy value increasing as the reliability increases with more
what do the accuracy values range from? information, such as progeny performance
- the amount of change will be decreased the closer the Acc. is to 1.0
- The initial EPD (pedigree estimated EPD) of a bull calf will be based on the average
of his parents.
- When this calf is weaned his weaning weight is included in the evaluation, and his
WW EPD is adjusted (interim EPD).
accuracy values: - The accuracy would also be increased substantially.
- Once he reproduces the accuracy increases with the performance of the progeny.
- Accuracy values can be thought of as a measure of risk.
- Bulls that have high accuracy values have much less risk when making breeding
decisions. Their EPD's are going to change much.
- Ex. Birth weight and weaning weight have a positive genetic correlation. In the
calculation of the BW EPD, the WW would be factored into the analysis to calculate
how are genetic correlation between traits
the BW EPD.
considered in the calculation of EPD's?
- Correspondingly, the birth weight would be considered in the calculation of the
weaning weight EPD.
- growth traits
- total maternal
what are some types of EPD's? - reproductive traits
- carcass traits
- other
- birth weight
- weaning weight
what are some growth traits?
- milk
- yearling weight
birth weight: - expressed in pounds, it is the difference in BW compared to the base animal
- expresses the expected difference in animal's offspring at weaning in lbs.
weaning weight?
compared to the base animal
- expresses the difference in the expected WW of the daughter's offspring resulting
milk: from differences in milk production
- it is expressed in lbs. of calf weaning weight, not in lbs. of milk
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