Age-Season Standardization

5/26/98

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Table of Contents

Age-Season Standardization

Research Objectives

Percentages of Holstein calvings by month and over time periods for regions 3 & 6.

Mixed Model Equations

Solving Equations

Age-Parity Classes

Average Days Open

Calculation of Adjustment Factors

Calculation of Adjustment Factors

Definition of Base Age

Mature vs. Average Age Adjustment

Example 3 (cont.)

Where Do We Go from Here?

Effects of Previous Days Open on Holsteins in MI, OH, and IN from 1987 to 1992

Author: Dr. Mike Schutz

Email: mschutz@ansc.purdue.edu

Home Page: http://www.anr.ces.purdue.edu/anr/anr/dairy/frame.htm

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