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Stayability
From BIF Guidelines Wiki
Stayability is generally defined as the probability of surviving to a specific age, given the opportunity to reach that age. Adapted to beef cows, the general definition of stayability is the probability of a cow surviving to her breakeven age, given the opportunity to reach that age. Cows usually need five consecutive calves by six years of age to generate enough income to pay their development and maintenance costs, so the age of six is was established as the target age for satiability. Without records of which females were retained for breeding and every calf they raised, cows with at least one calf before age six were considered to have opportunity, and successful cows had a calf at age 6 or older. Annual production records required by whole-herd reporting systems enable more rigorous definitions of stayability. Calving first as a two-year-old can indicate opportunity, and a calf every year through age six may be required for success.
