The days of just making dairy replacement females as fast and furious as possible have taken a back seat to making just enough of the “right” replacement heifers to minimize rising raising costs and maintaining the proper heifer inventories for replacing milking cows that leave the herd.
For complete article, https://www.agproud.com/articles/61883-striking-a-balance-genetic-superiority-vs-age
By Jeff Ziegler for Progressive Dairy