Question

Estimate the MPPA of a ewe for fleece weight with 2 records averaging 1.5 lb. above contemporaries. The regression coefficient (i.e. index weighting) can be calculated from the formula sheet in lecture 15. h² = heritability = .40 r = repeatability = .50

What is the regression coefficient for the MPPA?
What is the MPPA of the ewe?

Answer 1

To estimate the MPPA of the ewe for fleece weight, use the formula: MPPA = (contemporary group average) + (regression coefficient * (contemporary group average)).

Step-by-step explanation:

The regression coefficient for the MPPA can be calculated using the formula:

(2 * (covariance between the traits) * (heritability)) / (variance of contemporary group)

Given the information provided, the contemporary group average is 1.5 lb above the contemporaries. To estimate the MPPA of the ewe for fleece weight, we can use the formula:

MPPA = (contemporary group average) + (regression coefficient * (contemporary group average))

Using these formulas and the given values of heritability and contemporary group average, we can calculate the regression coefficient and the MPPA of the ewe.