How It Works   ~~   Timeline   ~~   Forms  ~~  Reports “The Granddaddy of Performance Testing” In 1962, Leo McDonnell, Sr. started Midland Bull Test with a small group of purebred breeders. This concept of weighing and measuring cattle and publishing the resulting data as far as birth weights, weaning weights, gainability, dam’s production and yearling weights was … Continue reading About MBT