Effects of bovine somatotropin on dry matter intake, milk yield and body temperature in Holstein and Jersey cows during heat stress.

@article{West1990EffectsOB,
  title={Effects of bovine somatotropin on dry matter intake, milk yield and body temperature in Holstein and Jersey cows during heat stress.},
  author={James W. West and Benjamin G. Mullinix and Jennifer C. Johnson and Karen Ash and Vicky Taylor},
  journal={Journal of dairy science},
  year={1990},
  volume={73 10},
  pages={2896-906}
}
Thirty-one lactating Holstein and Jersey cows were used to determine the effect of daily injections of 0 or 20 mg of recombinant bST in hot, humid weather. The comparison period lasted 80 d, from mid-June through August. The maximum and minimum ambient temperature and relative humidity averaged 34.6 and 22.2 degrees C and 100 and 59.8%, respectively. Body temperatures of somatotropin-treated Holsteins were elevated over controls by .2 and .3 degrees C at the a.m. and p.m. milkings, respectively… CONTINUE READING