Keeping ahead of the breeding game.

The article looks at the benefits being gained by the Kowalewski family of dairy farmers in Taranaki, New Zealand from using sire-proving bulls. Initially, the idea only served as a money-saving strategy. However, the family has learned that raising surplus heifers has become a way to maintain a top herd and has become a worthwhile additional income for them. The family's heifers are the result of sire-proving bulls from a herd that has been in the scheme for 27 years.