SELECTION INDEX POSSIBILITIES, PITFALLS, AND POTENTIAL CHANGES Michael MacNeil, PhD Delta G Miles City, Montana.

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SELECTION INDEX POSSIBILITIES, PITFALLS, AND POTENTIAL CHANGES Michael MacNeil, PhD Delta G Miles City, Montana

Selection Index

Possibilities Use genetic selection to improve economic merit Maximize present value of genetic improvement Consistent implementation of selection criteria Use complete set of economically relevant traits

Pitfalls Temptation to think selection can overcome advantages of heterosis Incomplete indexes Ignore genetic antagonisms Fail to address full production cycle Don’t give some traits the attention they are due Poor estimates of genetic parameters  poor estimates of EPD

Potential Changes Incorporate additional traits Update genetic evaluation systems Improved estimates of variance components More appropriate models Make indexes more complete Make genetic evaluation of ERT more accurate Incorporate genomic predictors / better relationships Enhance econometrics Increase ease of developing customized indexes

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