Selection Indexes

 

Indexing Your Way To Genetic Improvement – Part I
Burt Rutherford
BEEF Magazine
This is the first part to a two part series on selection indices. This article introduces selection indices and how they can simplify bull selection including commentary by Drs. Bob Weaber (Kansas State University, Beef Extension Specialist) and Mike MacNeil (Delta G, Miles City, Montana).

Indexing Your Way To Genetic Improvement – Part II
Burt Rutherford
BEEF Magazine
Second part of a series of articles on selection indices describing which index to use for your operation. This again includes commentary from Drs. Bob Weaber (Kansas State University, Beef Extension Specialist) and Mike MacNeil (Delta G, Miles City, Montana).

Comparison of Selection Indices
Wade Shafer, Ph. D.
American Simmental Association
A highly qualified panel, representing beef, poultry, pork and diary industries, compare notes on selection. Coordinated by Wade Shafer, ASA Director of Performance Programs.

Genetic-Evaluation System -Part 1: Economically Relevant Traits
Wade Shafer, Ph. D.
American Simmental Association
There has been a dramatic increase in the number of traits quantified by EPDs since the early years of genetic evaluation. The ASA currently publishes EPDs on 15 traits and more are in the hopper. This wide array of EPDs provides seed for significant genetic improvement.

Genetic-Evaluation System -Part 2: Economically Relevant Traits
Wade Shafer, Ph. D.
American Simmental Association
We are on a mission to increase the effectiveness of our geneticevaluation system by decreasing its complexity. Discussion in the June/July issue focused on narrowing our array of EPDs to economically relevant traits (ERTs). Though this makes life simpler, we are still faced with a difficult task— putting appropriate selection pressure on the ERTs. This is where the economic selection index (ESI) comes in.

Constructing ASA Economic Indexes
Wade Shafer, Ph. D.
American Simmental Association
Some are of the impression that we use our intuition to construct our indexes, much like a chef would put together a gourmet meal—a dash of this and a pinch of that and voila! The truth is that it is not nearly that exciting. ASA’s indexes are constructed very similarly to the way an accountant would calculate projections on how the purchase of a piece of equipment will impact a firm’s bottom line.

Understanding the ASAs New Economic Selection Indexes
Wade Shafer, Ph. D.
American Simmental Association
Though we’ve had the benefit of EPDs in our tool chest for over twenty years, having EPDs without economic selection indexes is a bit like having superhighways without maps—you can drive fast but can’t be sure you’re traveling in the right direction. Indexes provide the maps. Our first indexes, the Terminal (TI) and All-Purpose (API), were published in the Spring ’05 Sire Summary. They are also available online for all animals that have EPDs on the traits the index is composed. These indexes provide the most powerful tools for genetic improvement our breed has ever seen.

Improving Profit via Genetics
Wade Shafer, Ph. D.
American Simmental Association

 

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