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Beef Cattle EPD Exam: Latest Questions and Answers for Animal Science Students, Exams of Health sciences

Bellevue CollegeHealth sciences

A comprehensive overview of expected progeny differences (epds) in beef cattle, covering their definition, calculation, and application in breeding programs. It explains how epds are used to predict the genetic merit of animals for various traits, including growth, maternal characteristics, reproduction, and carcass quality. The document also discusses the factors influencing epd accuracy and the use of genomic information to enhance epd predictions. Useful for university students studying animal science, particularly those focusing on beef cattle breeding and genetics. It offers a detailed explanation of epds, their calculation, and their application in improving beef cattle production. The document also covers advanced topics such as genomic enhanced epds, providing a comprehensive understanding of the subject.

Typology: Exams

2024/2025

Available from 06/20/2025

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ANSC 4084 EXAM BEEF EPD EXAM 2025
LATEST REAL QUESTIONS AND
CORRECT ANSWERS GRADE 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
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Download Beef Cattle EPD Exam: Latest Questions and Answers for Animal Science Students and more Exams Health sciences in PDF only on Docsity!

ANSC 4084 EXAM BEEF EPD EXAM 2025

LATEST REAL QUESTIONS AND

CORRECT ANSWERS GRADE 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 ( 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 data calculating the EPD for this calf following weaning: - CORRECT

accuracy values: - CORRECT ANSWER - 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). - 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. how are genetic correlation between traits considered in the calculation of EPD's? - CORRECT ANSWER - 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 the BW EPD.
  • Correspondingly, the birth weight would be considered in the calculation of the weaning weight EPD. what are some types of EPD's? - CORRECT ANSWER - growth traits
  • total maternal
  • reproductive traits
  • carcass traits
  • other what are some growth traits? - CORRECT ANSWER - birth weight
  • weaning weight
  • milk
  • yearling weight

birth weight: - CORRECT ANSWER - expressed in pounds, it is the difference in BW compared to the base animal weaning weight? - CORRECT ANSWER - expresses the expected difference in animal's offspring at weaning in lbs. compared to the base animal milk: - CORRECT ANSWER - expresses the difference in the expected WW of the daughter's offspring resulting from differences in milk production

  • it is expressed in lbs. of calf weaning weight, not in lbs. of milk yearling weight: - CORRECT ANSWER - expresses the expected differences in the weight of progeny of 1 year of age
  • yearling wt. EPD is positively correlated with mature weight what is total maternal? - CORRECT ANSWER - expresses the expected difference in WW in calves from the daughters of an animal
  • bull A has a TM EPD of +60 and Bull B has a TM EPD of +50, we would expect the daughters of Bull A to produce calves 10 lbs. heavier at weaning
  • the EPD is calculated by taking one half of the WW EPD and all of the milk EPD what are some reproductive traits? - CORRECT ANSWER - scrotal circumference - gestation length
  • calving ease direct
  • calving ease direct 2

fat thickness: - CORRECT ANSWER - expresses the difference in external fat on the carcass in inches

  • a lower value is better, but some external fat is desirable marbling: - CORRECT ANSWER - expresses the expected differences in marbling (intermuscular fat) in the progeny retail product: - CORRECT ANSWER - expresses the expected difference in saleable meat from the progeny yield grade: - CORRECT ANSWER - expresses the differences in yield grade of the carcass of progeny
  • the major factors in YG are fat thickness, carcass weight and ribeye area tenderness: - CORRECT ANSWER - expresses the expected differences in tenderness of the carcass of the progeny in terms of lbs. of Warner Bratzler Shear Force required to cut through the meat what are some other traits? - CORRECT ANSWER - docility
  • stayability
  • some breed associations emphasize the traits that their breed excels in, but not necessarily fitting into your breeding program docility: - CORRECT ANSWER - expresses the expected difference in behavior in the progeny stayability: - CORRECT ANSWER - expresses the expected differences in longevity of the progeny in the herd

what are across breed EPD's? - CORRECT ANSWER - As noted, EPD are calculated on a breed by breed basis and thus they can't be compared directly.

  • The U.S. Meat Animal Research Center has calculated adjustment factors to allow comparisons of EPD's between cattle of different breeds.
  • Remember - Can't use adjustment factors to make direct comparison of breeds because each breed has different base year. table 1: Adjustment factors to add to EPDs of eighteen different breeds to estimate across breed EPD's - CORRECT ANSWER what is a genomic enhanced EPD? - CORRECT ANSWER - Technological advancements have improved our ability to analyze DNA.
  • Panel of DNA markers, SNP's ("snips", single-nucleotide polymorphisms)
  • A panel of critically selected SNP's for multiple traits provides molecular breeding value (MBV)
  • EPD for a trait is based on the individual's performance, pedigree information, progeny information and the MBV. what is an example of the potential of genomic enhanced EPD? - CORRECT ANSWER - 10 bulls produced by embryo transfer from the same bull and cow.
  • At birth they would all have the same EPD's for all traits. - Apply genomic evaluation to identify the superior bull(s) in the group.
  • Obviously, genomics has potential to make selection much more accurate. American angus association image: - CORRECT ANSWER
  • Producer 3 has a herd of above average frame cows and is not planning on keeping heifers as replacements. She is looking for a bull that will give her the most profit at weaning.
  • Producer 4 wants to maintain his calving performance and growth performance but would like to increase the milking ability in his females. what are some additional facts to remember about EPD's? - CORRECT ANSWER - EPDs are the best overall prediction of progeny performance and are useful tools that aid in selection.
  • EPDs can be used to compare bulls/cows from different herds.
  • EPDs cannot be used to compare bulls/cows of different breeds.
  • EPD's on non-parent bulls/cows allow valid comparisons before progeny records are available.
  • EPDs on non-parents are calculated using pedigree information and individual records, if available.
  • A pedigree estimated EPD (PE) is the average of two parental EPD values (½ sire, ½ dam)