Multi-part problem: (Hint: remember you are calculating a regression then use th
ID: 271778 • Letter: M
Question
Multi-part problem: (Hint: remember you are calculating a regression then use this to weight the new performance data)Romeo, a promising thoroughbred stallion, was recently retired to stud. His first seven foals have just completed their maiden races, averaging 2.0 seconds faster than their contemporary group means.
Use a single-source selection index to predict Romeo’s breeding value for racing time. (Assume h2 = 0.36) (1pt)
Calculate accuracy of prediction. (0.5 pts)
Aragorn, the old champion, has sired 119 foals. They have run, on average, 5.3 races apiece, averaging one second faster than contemporary group means.
Predict Aragorn’s breeding value for racing time. (Assume h2 = 0.36 and r=0.55) (1pt)
Calculate accuracy of prediction. (0.5 pts)
Why is Aragorn’s EBV better than Romeo’s even though Romeo’s offspring have run faster than Aragorn’s? (1pt)
All else being equal, which sire would you use? Why? (1pt)
Explanation / Answer
Answer
Given data:
h2 = 0.28, averaging time = 2 seconds
The breeding index value is calculated as follows:
EBV = h2*x
= 0.28*2
= 0.56
The accuracy of prediction is clculated as follows:
accuracy of prediction = h2/n (n = number of foals 7)
= 0.28/7
= 0.04
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.