As an example, if there is a 20
percent reproductive surplus of females and the
current population is composed of 50 percent
pure-breeds and 50 percent cross-breeds (includes
any pure-bred females that are currently being
used for cross-breeding), the population could
move towards a composition of slightly more
than 50 percent pure-breeds producing purebreeds,
slightly more than 20 percent pure-breeds
producing F1s, and slightly less than 30 percent
F1 females, without any further reduction in
the size of the pure-bred population that is
producing pure-breeds. These values assume that
none of the females produced by the F1 females
are retained as breeding females; in reality, this
would probably never occur.