| Summary: | 碩士 === 國立中興大學 === 動物科學系所 === 104 === Phytogenic feed additives are commonly defined as plant-derived compounds that are used as natural growth promoters. They are incorporated into diets to improve productivity and immunity of livestock. (Various plants have been researched for use; teas of Camellia sinensis have been reported to contain aromatic properties that have an impact on gut micro-flora, nutrient digestibility, intestinal morphology and immunity). The aim of this study was to investigate the effects of dietary green tea and oolong tea powder supplementation on broiler growth performance, antioxidant activities and intestinal characteristics. Proximate analysis and antioxidant capacity on green tea and oolong tea powders were measured. (The total phenolic content, Trolox Equivalent Antioxidant Capacity, DPPH radical scavenging effects, H2O2 chelating ability). The total phenolic content, fiber content, TEAC antioxidant effects were much higher with oolong tea powder compared to green tea powder. The experimental design consisted of a total number of mixed-sex 240 day-old ROS 308 chicks (120 males and 120 females) allocated to three treatments with four replicates containing 20 birds each. The dietary treatments were inclusions of 0.5% green tea powder, 0.5% oolong tea powder and the control group. Blood collection from the wing vein was done at days 19 and 31 for catalase and malondialdehyde determination. Body weight and feed intake of broilers were measured at 1, 21, and 35 days, and the feed conversion ratio was calculated accordingly. At days 21 and 35 four birds from each replicate were slaughtered and organs (intestines, liver, spleen, and heart) were weighed. Intestinal contents were collected into containers for microbial counts.
The supplementation of 0.5% green tea and 0.5% oolong tea powder had significant effect on broiler weight gain and feed intake (P < 0.01) but didn’t had no effect on body weight compared to the control group. However the supplementation of 0.5% green tea and 0.5% oolong tea powder decreased caecal coliform count (P < 0.01) and improved blood serum antioxidant activities by increasing serum catalase concentration (P < 0.01) and decreased serum malondialdehyde (P < 0.01). In conclusion, the results obtained from this study had shown that the supplementation of 0.5% green tea and 0.5% oolong tea powder in broiler diets from 1 to 35 days could decrease cecal microbial counts and increase blood serum antioxidant activities.
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