Crossbreeding offers the potential for improved eco-
nomic efficiency through the introduction of favourable
genes from another breed that has been selected for the
relevant traits (breed complementarity),through avoidance
of the negative effect so fin-breeding,and capitalising on the
expression of heterosis as hybrid vigour (Begleyetal.,2007).
Cross breeding can be particularly important in the improve-
ment of traits with low heritability such as fertility and
health(Begleyetal.,2007, Prendivilleetal.,2011).