Thirty years of HI, or in other words: 360 HI editions! Enormously fascinating to leaf through all 360 editions – and thus to conclude that global breeding has gone through many phases. And especially: that the Holstein cow continues to become more complete and more profitable. Yes, effective breeding has led to tremendous progress, of which 360 editions of HI are a splendid witness. Welcome to our journey through 360 HI editions, with a sampling of all of the popular sires during those thirty years.