Health and fertility traits are of major economic importance so ignoring them in selection is a lost opportunity. There are also welfare, and thus ethical reasons, for including them in selection. Also, these traits are unfavourably correlated with milk yield, so ignoring them in selection will lead to deterioration in genetic merit for these traits (e.g. Kadarmideen et al., 2000 and 2001). The main objective of this study was to study the selection responses expected from selection on possible future versions of the UK total merit index (TMI), called Profitable Lifetime Index or £PLI. £PLI is based on predicted transmitting abilities (PTAs) for kg milk, fat and protein yield, and lifespan. The indexes investigated here had various combinations of health and fertility traits added as breeding goal (gl) or measured index (ix) traits.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 1, , 1.19, 2002
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