In order to describe improvements in welfare traits relative
to themarket genetic gain, themarket genetic gainwas defined
as the genetic gain with breeding goal traits and economic
values from the scenario 1. Gains in leg condition, in piglet
mortality and weaning-to-mating interval were assumed to
have both market and non-market values. Non-market and
market genetic responses for traits (ΔGEV and ΔGNV, expressed
in trait unit) were estimated from the following formula: