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. 2011 Mar;55(2):253-63.
doi: 10.1007/s00484-010-0331-3. Epub 2010 Jun 4.

Dynamics of the temperature-humidity index in the Mediterranean basin

Maria Segnalini  1 , Alessandro Nardone, Umberto Bernabucci, Andrea Vitali, Bruno Ronchi, Nicola Lacetera
Affiliations

Dynamics of the temperature-humidity index in the Mediterranean basin

Maria Segnalini et al. Int J Biometeorol. 2011 Mar.

Abstract

The study was aimed at describing the temperature humidity index (THI) dynamics over the Mediterranean basin for the period 1951-2007. The THI combines temperature and humidity into a single value, and may help to predict the effects of environmental warmth in farm animals. In particular, on the basis of THI values, numerous studies have been performed to establish thresholds for heat stress in dairy cows. The THI was calculated by using monthly mean values of temperature and humidity obtained from the National Center for Environmental Prediction/National Center for Atmospheric Research reanalysis project. The analysis demonstrated a high degree of heterogeneity of THI patterns over the Mediterranean basin, a strong north-south gradient, and an overall warming during the study period, which was particularly marked during summer seasons. Results indicated that several areas of the basin present summer THI values which were unfavorable to cow welfare and productivity, and that risk of heat stress for cows is generally greater in the countries of the south coast of the basin. Furthermore, THI data from the summer 2003 revealed that severe positive anomalies may impact areas normally characterized by a favorable climate for animal production. In conclusion, THI dynamics should be taken into careful consideration by farmers and policy makers operating in Mediterranean countries when planning investments in the sector of animal production. The investments should at least partially be directed towards implementation of adaptation measures, which may help to alleviate the impact of hot on farm animals welfare, performance and health.

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