ideal cow cycles (ovulates) early in life ( 12 months of age) and within 45
days after calving, becoming "in calf" the first time she is
given the opportunity. Many of the tools described in the Herd Management
Section were implemented to develop this trait. Heifers are given 45 days
to become bred, cows 60 days. Open cows are removed from the herd. Sires
are also selected for early and marked sexual maturation.
Australian researcher P.R. Holmes PhD, when reviewing economic impacts,
shows fertility as 5 times more important than growth and 10 times more
important than carcass traits.