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 A new type merit formula has been introduced in the January proof run – the proofs will now be thrice yearly instead of quarterly. The Type Merit formula has been rewritten to reflect industry changes and is the biggest overhaul for a number of years. The new formula will more accurately reflect health, welfare, balance and longevity in the dairy cow although the ultimate measure of profitability has not been ignored.

For information on the terms used here please visit the Glossary page.

 The main emphasis of the new formula is on functional type – udders, feet and legs. The mammary system now comprises 40% of the total score with feet and legs at 30%. The remaining 30% is made up of the body traits with less emphasis now on stature and angularity and more emphasis on chest width and rump width. So the breakdown is now as follows (the same for UK and International bulls):

 40% Mammary

30% Legs & Feet

30% ‘Goal Trait’ of Longevity – calculated using Stature, Angularity, Body Depth, Chest Width, Rump Angle and Rump Width.

 As a result, Type Merit will now be more positively associated with increased Lifespan, £PLI, Fertility Index, Locomotion, Fore Udder Attachment and Mammary composite generally, whilst at the same time reducing Cell Counts.

 APRIL 2008

There have been very few changes to the rankings from January to April and there will be a detailed report on the August run.

Acknowledgements: HUK. MDC Evaluations 

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