혹서기 무창계사에서 육계의 혈액지질 및 짧은 사슬지방산에 관한 역전점등과 냉각수 효과

초록

This experiment evaluated the interaction effect of extreme heat diet(EHD), inverselighting, and cool water on the growth performance of broiler chickens under extreme heat stress. There were 4 experimental groups (T1: EHD 1, 10:00-19:00 dark, 19:00-10:00 light, cold water9℃; T2: EHD 2, 10:00-19:00 dark, 19:00-10:00 light, cold water 9℃; T3: EHD 1, 09:00-18:00dark, 18:00-09:00 light, cold water 14℃; T4: EHD 2, 09:00-18:00 dark, 18:00-09:00 light, coldwater 14℃), each group composed of 25 broilers and the experiment was repeated 3 times. EHD 1contained soybean oil, molasses, methionine and lysine. EHD 2 contained all nutrients of EHD 1and vitamin C additionally. As a result, T1 and T2 displayed higher body weight increase and dietintake compared to T3 and T4 (p<0.05). The weights of their liver and gizzard were similar butthe weights of the thymus and bursa F were higher for T1 and T2 compared to that of T3 andT4 (p<0.05). It was observed that T1 and T2 displayed higher concentrations of blood triglyceride,total cholesterol, HDL-C and blood sugar compared to that of T3 and T4 but LDL-C level washigher for T3 and T4 compared to that of T1 and T2 (p<0.05). T1 and T2 displayed higher levelsof immunity substances such as IgG, IgA and IgM compared to T3 and T4 but the blood level ofcorticosterone displayed to be lower for T1 and T2 compared to T3 and T4 (p<0.05). The T1 andT2 contained a higher amount of fecal lactobacillus compared to that of T3 and T4 but the T3and T4 contained a higher amount of fecal E. coli, total aerobic bacteria, coliform bacteriacompared to that of T1 and T2 (p<0.05). T1 and T2 displayed higher concentrations of cecalacetic acid, propionic acid and total short chain fatty acids compared to T3 and T4 but T3 and T4 displayed higher concentrations of butyric acid, isobutyric acid, valeric acid and isovaleric acidcompared to T1 and T2 (p<0.05). These results have been observed that broiler chickens exposedto extreme heat stress with feeding EHD, inverse lighting and cold water would improve bloodlipid, and elevate the production of immunity substance, beneficial microorganisms, and short chainfatty acids. This provision would also reduce the blood sugar consumption rate as energy sourcesand these effects will improve the growth performance of the broilers exposed to extreme heat.

키워드