DHI-202 Herd Summary

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13. Yearly Production and Health Summary
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production to be above the normal “expected” level.
Test Day Averages (All Cows) report average milk production, fat % and protein % for all cows in
the herd, including dry cows. The % of cows in the herd in milk on test day is also reported.
Rolling Yearly Herd Average for milk, fat and protein for each test period in the past year are listed.
A detailed description of the Rolling Herd Average calculation is in section 2b.
Somatic Cell Count Summary includes the % of cows in each of the five SCCS categories (see item
10). The Average SCC Score is calculated as an unweighted average of SCC scores of milking cows on
test day. The Actual SCC reported is a weighted average actual somatic cell count to the nearest 1000.
This information is a valuable tool for dairy farmers in monitoring the udder health of the herd. The
trend in Average Somatic Cell Counts should be observed each month. Large increases may indicate
faulty milking equipment, improper milk practices and/or poor environmental conditions. These items
should be examined as possible reasons for an increasing SCC Score.
Number Left Herd includes the number of cows died or sold during each test period.
Test Period Average Milk Lbs. Added and Test Period Average Milk Lbs. Dropped should be used to
evaluate changes in the Rolling Herd Average for milk. An explanation of the use of test period averages
in calculating the Rolling Herd Average is given in section 2b.