CH. 14

Question 1

Single-triat Selection

Answer 1

Selection for one trait

Question 2

Multiple-Trait Selection

Answer 2

Selection for more than one trait

Question 3

Aggregate Breeding Value or Net Merit

Answer 3

The breeding value of an individual for a combination of traits

Question 4

Tandem Selection

Answer 4

Selection first for one trait, then another

Question 5

Selection trait

Answer 5

A level of breeding value considered optimal in an absolute or practical sense.

Question 6

Independent Culling Levels

Answer 6

Min. standards for traits undergoing multiple trait selection. Animals failing to meet any one standard are rejected regardless of merit in other traits.

Question 7

Economic Selection Index

Answer 7

An index or combination of weighting factors and genetic info– either phenotypic data or genetic predictions– on more than one trait. Economic selection indexes are used in multiple-trait selection to predict aggregate breeding value.

Question 8

Breeding objective

Answer 8

A weighted combination of traits defining aggregate breeding value for use in an economic selection index.

Question 9

Economic weight

Answer 9

The change in aggregate breeding value (the change in profit if that is how aggregate breeding value is measured) due to an independent, one-unit increase in performance in a trait

Question 10

Phenotypic Selection Index

Answer 10

A form of economic selection index used with phenotypic selection, In the classic form of phenotypic index, the traits in the index are identical to the traits in the breeding objective.

Question 11

Effective Proportion Saved

Answer 11

In selection- a value that, when substituted for actual proportion saved (p), reflects correct selection intensity.