12: Breeding Value and Genetic Value pt2 Flashcards
Each parent will transmit …
half of its genes to its offspring, as well as, on average, half its BV
BVoffspring =
(1/2)(BVsire) + (1/2)(BVdam)
The performance of the offspring =
Mean performance (u) + BVoffspring
Poffspring =
u + (1/2)(BVsire) + (1/2)(BVdam)
Group of offspring from the same parents will have a range of genetic merit that will look like
a graph with normal distribution (high and low phenotypic performances)
Half the parents BV transmitted to its offspring is called…
progeny difference (PD)
Slide 19, 20
Average performance of all sire’s offspring
Key ingredient determining progeny BV and performance…
BV of parents
When is the likelihood of getting offspring with higher breeding values greater?
When parents with superior breeding values are mated
The EBV provides…
an estimate of the genetic potential of each animal
EBV accuracy is the…
accuracy of an estimated breeding value. indicates how good the estimate represents the true BV
The genetic model for repeated traits represents…
single performance record of an individual in a trait for which individuals typically have multiple records
What is permanent environmental effect? E.g.
Environmental effect that permanently affects an individual’s performance for a repeated record
e.g. calfhood nutrition to milk production
What is temporary environmental affect? E.g.
Environmental effect that affects a single performance record of an animal, but does not permanently affect the individual’s performance potential for a repeated trait
e.g. effect of forage digestibility influencing milk production
What is a repeated trait
Traits for which individuals commonly have more than one performance record
