A profit index combining transmitting abilities for yield and angularity, udder depth, foot angle and teat length
 is developed for selection towards a goal comprising milk (£-0.03 /kg), fat (£0.60 /kg), protein (£4.04 /kg) and
 longevity (£5.52 /% of cows surviving till lactation 4). Sensitivity analysis showed that the index developed was robust towards changes in the assumptions made.

Roel F Veerkamp, S. Brotherstone, A. W Stott, William G Hill, G. Simm

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 69–72, 1994
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