08/00 Genetics Changes
Briefs on Genetic Evaluation Changes

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Volume10,
No. 10

AUG, 2000

JERSEY

     Simplified, the average cow index for Jerseys has improved by 544 lbs. milk, 18 lbs. fat, 19 lbs. protein and just over a point on type over the past five years. In order to bring the "average" cow back to zero to reflect the progress the breed has made in the past five years, these values have been reduced from the current formulas. For instance, a cow that was +1544M 48F 39P and +3.0T before would now have an index of +1000M +40F +20P +2.0T, given all other things remained constant.

     A few other changes are Net Merit $ now being expressed in a lifetime value versus a lactation value. It includes values for increased production, minus the cost of production plus productive life.

     It also includes the value of improved udder traits and lower somatic cell scores.
PTA protein is now expressed as a "true" protein instead of crude protein.

HOLSTEIN