Questions and Answers
EPDS estimate how an animal's offspring will perform compared to breed average and/or other animals' offspring.
True
Which EPD or index predicts the reproductive longevity of a bull's daughters?
Stayability
SimAngus M Bull J has a BW EPD of 1.5. SimAngus M Bull K has a BW EPD of -1.5. Based on this information, which of the following statements is definitely true?
A Purebred Simmental cow is bred to a 1/2 Simmental 1/2 Angus bull. What will be the breed composition of the resulting calf?
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Adjusted weaning weight, and therefore the WW EPD, is adjusted to 205 days of age.
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What happens to an animal's EPDS as more resources, such as progeny reports and genomic data, are added to the database in which they are calculated?
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How much of an animal's genetic makeup is contributed by its maternal granddam?
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Which common beef production practice increased the need for multi-breed genetic evaluations?
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What does EPD stand for?
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What does the MILK EPD measure?
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An animal's genotype for color coat is Bb. What is this animal's most likely phenotype?
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Ribeye area is measured in square inches.
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You are selecting AI sires based on the goal of making replacement females. Which of the following EPDs/indexes should not be a part of your selection process?
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Purebred Bull P has a CE EPD of 19.3 with an accuracy of 0.86. Purebred Bull Q has a CE EPD of 19.3 with an accuracy of 0.52. Which bull should you feel more confident using on your heifers?
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Which ASA program combines the use of EPD data and visual evaluation in the show ring?
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You are using your solid red, non-dilutor herd sire on a group of 32 females. Assuming 100% conception and calf survival rates, how many red calves should you expect to have?
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______________ are directly associated with costs and/or revenue sources within beef production.
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Donor dam Y52 has a YW EPD of 88.5 with an accuracy of 0.60. As this accuracy of this EPD increases, you would expect it to be within ___________ points of its current value.
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What would have a positive effect on the USDA Yield Grades of an animal's offspring?
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Study Notes
Genetic Evaluations and EPDs
- EPDS estimate an animal's potential offspring performance compared to breed averages and other animals.
- The accuracy of EPDs improves with additional data, such as progeny reports and genomic information.
EPD Concepts
- Stayability predicts the reproductive longevity of a bull's daughters.
- Expected Progeny Difference (EPD) is a key metric in assessing breeding potential.
Breeds and Crossbreeding
- A Purebred Simmental cow bred to a 1/2 Simmental 1/2 Angus bull results in a calf that is 3/4 Simmental and 1/4 Angus.
- Crossbreeding has increased the demand for multi-breed genetic evaluations.
Weaning and Maternal Influence
- Adjusted weaning weight (WW EPD) is standardized to 205 days of age.
- An animal’s maternal granddam contributes 25% to its genetic makeup.
EPD Measurements and Traits
- MILK EPD measures the pounds of weaning weight attributed to maternal milk production.
- Economically Relevant Traits (ERTS) are linked to costs or revenue sources within beef production.
Selection and Confidence in Bulls
- For selecting sires aimed at producing replacement females, Total Index (TI) should not be considered.
- Higher accuracy EPDs, like Bull P's CE EPD of 19.3 with an accuracy of 0.86, instill greater confidence when using on heifers.
Color Coat Genetics
- An animal with genotype Bb most likely has a black phenotype.
- Ribeye area is measured in square inches, confirming its quantifiable aspect in beef evaluations.
Calf Predictions and Economic Decisions
- In a scenario with 32 females (16 heterozygous black, 4 homozygous black, and 12 red), expect 20 red calves.
- Choosing herd sires based on SAPI and Total Index (TI) can validate higher spending for better genetic potential, as in Bull X over Bull Y.
Yield Grades and Quality
- Offspring with lower than average Back Fat EPD positively influence USDA Yield Grades, indicating better meat quality potential.
Program Associations
- The program "Progress Through Performance" integrates EPD data with visual evaluation in cattle showing contexts.
Donor Dam EPD Implications
- Donor dam Y52's YW EPD of 88.5 with an accuracy of 0.60 indicates that with increased accuracy, the true value can be expected to be within 10.3 points.
Studying That Suits You
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Description
Test your knowledge on genetic evaluations and EPDs with this quiz focused on the 2019 AJSA National Classic. Ideal for those studying animal genetics, it covers topics such as reproductive longevity and performance estimates. Challenge yourself with true or false questions and specific examples.
