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The study examined the effects of drinking water temperature on laying hens' production performance and well-being. The results showed that hens' body weight, feed consumption, and egg production were affected by the temperature of their drinking water. In particular, high temperatures (27°C) led to reduced body weight, feed consumption, and egg production compared to lower temperatures (15-21°C). The study also found that the hens' shell dry weight was unaffected by the drinking water temperature. The study's findings suggest that providing cooled drinking water can enhance laying hens' production performance and well-being.Please note that this summary is based on the extracted text and may not fully capture all the details of the original study.