The expression of a high production (PD) potential in adverse conditions may be compromised directly (by impaired development of supportive or endocrine systems) and indirectly (when PD overrules coping functions in access to resources). Poultry breeding has known important limitations of this type, counteracted by selection for robustness (RB) traits. Profitability of pig PD can be enhanced by improvement of a RB trait at a similar rate as by improvement of a PD trait. We present profit equations that support the inclusion of direct RB traits in breeding objectives. Much information on the relation between PD and RB is anecdotal; we present recent information for several traits and conclude that the evidence is inconclusive. Simultaneous genetic improvement of

P. W Knap, Wang LiZhen

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 06.01, 2006
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