Breeding Worth (BW) is the National Breeding Objective (NBO) in New Zealand.
BW ranks bulls and cows on their expected ability to breed profitable and efficient replacements. Breeding Worth is an economic index and is calculated by multiplying breeding values with the appropriate economic values.
A Breeding Worth index is calculated for all recorded dairy animals, although the source of information differs slightly depending of the sex of the animal. Both cows and bulls have ancestry and progeny information included (where available), while cows have the additional data source of their own information.
The source and volume of the information available on an animal effects the reliability of their BW, which is essentially the confidence that we have in our breeding predictions.