An analysis of age and body weight at first calving for Holsteins in the United States.

@article{Losinger1997AnAO,
  title={An analysis of age and body weight at first calving for Holsteins in the United States.},
  author={Willard C. Losinger and Arlyn J. Heinrichs},
  journal={Preventive veterinary medicine},
  year={1997},
  volume={32 3-4},
  pages={193-205}
}
In a national survey of US dairy producers, only 2.7 +/- 0.5% of Holstein dairy operations reported achieving recommended target ranges of age < or = 24 months and body weight (BW) > or = 550 kg at first calving. Allowing for wider target ranges, still only 14.6 +/- 1.3% of Holstein dairy operations reported achieving age < or = 25 months and BW > or = 544.3 kg at first calving. Ages of individual first-calf heifers observed at calving were heavily skewed toward older individuals. Dairy… CONTINUE READING