Reciprocal Recurrent Selection (RRS): Improves

Correct Answer: Both GCA and SCA

From the notes: Reciprocal Recurrent Selection (RRS) is more suitable for poultry and is used to improve both GCA and SCA simultaneously.

Types of Recurrent Selection

• Simple Recurrent Selection (RS): Improves GCA (additive gene action)
• Reciprocal Recurrent Selection (RRS): Improves both GCA and SCA (given by Comstock) ✔

From Match Column Q40 (Answer key note)

RRS = Comstock (from Q192 match: 2) RRS = e = Comstock). RRS exploits both types of gene action simultaneously, making it the most comprehensive selection system for poultry where hybrid production is important.

Why Suitable for Poultry?

Poultry has short generation interval, large family sizes, and the commercial industry depends heavily on hybrid (crossbred) production — making exploitation of both GCA and SCA through RRS very practical.