혹서기 음용수의 온도가 산란계의 생산성, 호르몬농도 및 혈액성상에 미치는 영향

An experiment was undertaken to investigate the effects of different drinking water temperature on performance, hormone concentration and blood composition of laying hens during hot-humid summer season (33℃ and 60%). A total of four hundred thirty two, fifty three age Hy-Line brown laying hens was used, divided into three treatments of eight replicates of twelve hens each (550 cm2/bird) until the end of the experiment fifty seven weeks. Treatments have consisted on at the set water temperature of 14.5, 24.0 and 32.5℃. Productive performances were evaluated by measuring egg production, egg weight, feed consumption, egg mass and feed conversion of eggs. At the end of trial, egg quality traits were measured, and the physiological performance determined by measuring some biochemical traits of blood and hormone concentration. Results of this study showed that egg production and daily egg mass were significantly (p<0.05) higher in 14.5℃ water treatment group but feed intake and egg weight did not differ statistically in between 14.5 and 24.0℃. Albumen height and haugh unit in eggs had not been affected by drinking different water temperature, while there was significant (p<0.05) increase of shell strength in 14.5 and 24.0℃ water temperature treatment group than 32.0℃ and shell thickness also was numerically increased in 14.5℃ without significance. Moreover, concentration of GH and IGF-I both serum and liver had significant (p<0.05) increase in the order of 32.5, 24.0 and 14.5℃ group, and serum corticosterone was significantly (p<0.05) decreased in drinking water of 14.5℃ treatment. Furthermore, serum AST and cholesterol were significantly (p<0.05) reduced in hens drunk 14.5℃ water compared with 24.0 and 32.5℃ water. HDL cholesterol, protein and glucose were not influenced by following water temperature, whereas lowest (p<0.05) natural fat was found in subject to 14.5℃ water treatment group. It could be concluded that during summer season especially under hot-humid period 14.5℃ drinking water temperature can improve the performance, egg quality and blood.