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Evaluating effectiveness of spraying systems to reduce heat stress on dairy cows

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2012 IX International Livestock Environment Symposium (ILES IX)  ILES12-0437.(doi:10.13031/2013.41627)
Authors:   Hao Li, Zhengxiang Shi, Chaoyuan Wang, Tao Ding, Dinglei Yan, Linjia Fan, Lihu Bian, Xiaodong He
Keywords:   Dairy, Heat Stress, Spraying system

The objectives of the paper are to select appropriate type of nozzle for a spraying system which generates large water droplets and to evaluate its cooling effects on heat-stress prevention of dairy cattle. The nozzles were installed at five different angles (45o, 0o, -45o, -90o, -135o), and tested with three different incoming water pressures (0.10 Mpa, 0.15 Mpa, 0.20 Mpa). The results showed that refraction nozzle installed at -135 were the most efficient. After screening out the spraying nozzles, a field experiment was conducted in a commercial dairy farm in summer to test the cooling effect of the modified spraying system by monitoring and evaluating the ambient temperature, thermal humidity index (THI) and physiological index of the cows. For the field, ambient temperature and THI inside the dairy cattle shelters installed with the spraying systems were significantly decreased during the experimental period. The ambient temperature was averagely lowered by 2.0C in treatment group, with an average value of 26.90.20C. The surface temperatures of the frontal shoulder and udder, rectal temperature and respiratory rate of the cows in the treatment group were 2.3C, 2.1C, 0.6C and 18 times min-1 lower than those of the control group, respectively. The milk production of cows in treatment group was 4% higher than that of the control group.

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