HEAT WAVES INFLUENCE ON MILKYIELD IN SÃO PAULO STATE
DOI:
https://doi.org/10.18011/bioeng2007v1n1p70-81Keywords:
Milk yield, weather change, THIAbstract
This research has as general objective to estimate milk production losses as functionof heat wave incidence based on the temperature and humidity index (THI). Therefore it was determined the THI frequency of occurrence above the critical level (81). A historicalof heat wave occurrence was developed based on climatic data in an interval of three toten years. It was validated the use of medium THI through the MDEC (milk decline) using milk yield data from a commercial farm. The results showed that the countries within the Paraiba Valley dairy region as well as Presidente Prudente Country presented the highest number of heat wave occurrence per year, and that not always the heat wave with longest period presented higher intensity of occurrence. The results of THI validation demonstrated the use it just a single parameter it's not a good indicator ofreducing in milk yield by thermal stress. The conclusion is that the study of heat wave occurrence shows in a more effective way the heat stress effect on dairy production which is not practically identified when studying just the average THI occurrence.
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Copyright (c) 2014 Karla A. O. Lima, Daniella J. Moura, Irenilza A. Nääs, Mauricio Perissinoto
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