A re-evaluation of the impact of temperature humidity index (THI) and black globe humidity index (BGHI) on milk production in high producing dairy cows

  • Zimbelman R
  • Rhoads R
  • Collier R
 et al. 
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The THI was originally (~50 years ago) developed using low producing cows and non- cyclical heat and traditionally a THI of 72 is thought to reduce milk production in lactating dairy cows. • We have conducted 8 studies (100 multiparous Holstein cows) to determine the minimum, maximum, and average THI threshold for milk yield loss in high producing dairy cows. • Physiological and production parameters indicate a new THI threshold for lactating dairy cows producing more than 35 kg/day should be 68. • Current data indicates that there is no advantage of replacing THI with BGHI

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  • R. B. Zimbelman

  • R P Rhoads

  • R J Collier

  • G.C. Duff

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