Aids to Selection: Match the Column

Correct Answer: 1-d, 2-c, 3-a, 4-b

From the notes (Aids to Selection section):

• 1. Selection Index (d) = Most efficient method of selection: Single numerical expression combining multiple traits with appropriate weights. Given by Hazel and Lush (1942). Best overall method.
• 2. Progeny testing (c) = Most efficient aid to selection: Used to select SIRES. Based on performance of progeny (daughters). Most effective for sex-limited traits and low-h² traits. Also called a 'two-way selection system'. Increases generation interval — reduces genetic gain per year.
• 3. Individual selection (a) = Most accurate aid to selection: Based on animal's own phenotype. Most rapid. Shortest generation interval. Effective when h² is high. Simplest and most commonly used.
• 4. Sib selection (b) = Best aid for carcass traits in sheep: Based on performance of siblings. Used when the individual cannot be measured (carcass traits require slaughter). A type of family selection.