Abstract
Heat stress is one of the major factors adversely affecting animal welfare and thus economic benefits of farms. This study was designed to determine the effects of three different spraying methods on goats for reducing heat stress. Thirty goats divided into three groups for the trial (One time sprayed a day: OTS, Two times sprayed a day TTS and Non-sprayed: Control). Respiration and pulse rates, rectal and surface temperatures (from head and udder skin) were taken three times a day (08.00-09.00, 16.00-17.00 and 12.00-01.00) on hot summer days in July-2005 under Mediterranean conditions. Some behavioural aspects such as eating, ruminating, drinking, walking and resting, daily feed and water consumption were regularly measured. The results showed that rectal temperatures (p≤0.005), pulse (p≤0.054) and respiration rates (p≤0.049), udder (p≤0.041) and head temperatures (p≤0.033) in three groups were significantly different. Depending on rising air temperature, rectal, head and udder temperatures and respiration and pulse rates increased during daytime and retired to normal level at night time. TTS goats were superior to the others regarding above-mentioned physiological data. TTS goats spent more time than OTS and Control goats while eating (p≤0.02), ruminating (p≤0.04) and walking (p≤0.01) but less time while drinking (p≤0.01) and resting (p≤0.01). Significant changes between three groups were ascertained regarding feed and water consumptions. TTS goats consumed more concentrate feed (p≤0.042) and alfalfa hay (p = 0.032) than other two groups, whereas Control groups consumed more water (p≤0.012) than the others. Ultimately, the spraying has positive effects on yearling goats for alleviating heat stress and improve animal welfare.
Highlights
Heat stress in animals causes decreases in feed intake and efficiency, in extreme cases, it can even cause death
These results indicate that Control goats had a higher stress load, which might indicate that they were stressed in an extreme temperature situation
Hours a day Normally, it is difficult and expensive to maintain the welfare of farm animals under hot and humid weather conditions
Summary
Heat stress in animals causes decreases in feed intake and efficiency, in extreme cases, it can even cause death. These losses amount to millions of dollars each year. Providing plenty of clean and available water, enough shaded areas and good ventilation should be routine. These areas are the first places to concentrate if a heat stress problem is evident in the herd. Animal & Vet. Sci., 2 (4): 99-103, 2007 designed to determine the effects of three different spraying methods on crossbred goats in order to decrease heat stress. The objective of this initial study was to evaluate to thermal heat stress on goats and determine the cooling methods based on spraying and ease of use in subtropical climate conditions
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