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MEKARN Conference 2010 |
Department of Animal Nutrition and Feed Processing;
*Center for Livestock Genetic Conservation and Feed Processing Station;
**ThuyPhuong Poultry Research Centre.
National Institute of Animal Husbandry Hanoi, + 84 04, Vietnam
Two experiments were carried out to find out suitable methods to produce natural-antibiotics and evaluate the effect of replacement of antibiotics with phyto-antibiotics of the ginger and garlic extracted products on digestibility and performance of broiler chicken. First experiment was conducted to evaluate effect of two processing methods (hydroalcoholic extraction and oven-drying ) on antibiotic content of garlic and ginger. The results showed that allicin content (phyto-antibiotic content) of hydroalcoholic extracted and oven-dried garlic was 270 and 200 mg/kg DM, respectively and was 15 % and 40 % lower compared to the fresh garlic (320 mg/kg DM). The ally sulfides (phyto-antibiotic content) of hydroalcoholic extracted and oven-dried ginger was 120 and 100 mg/kg DM, respectively and was 20 % and 35 % lower compared to the fresh ginger (150 mg/kg DM). Second experiment was conducted with 120 Luong Phuong chickens from 4 to 12 weeks of age to evaluate the effects of replacement of antibiotics (Tylosine) with phyto-antibiotics (dried ginger and garlic) on performance of broiler chickens.
Mean daily dry matter, crude protein and metabolisable energy intakes were higher for the control treatment (without antibiotic supplementation) (78.9 g, 12.7 g and 874 KJ, respectively) than for the antibiotic supplementation (64.9g, 11.9 g and 872 KJ, respectively) (P<0.01) and higher for the supplemented garlic (64.9 g, 11.10 g and 816 KJ, respectively) and higher than for the supplemented ginger (69.3 g, 11.9 g and 872 KJ, respectively) (P<0.01). Mean DM intake was 78.0 and 64.9 g/day for the males and females (P<0.001), respectively. Average daily weight gains (ADG) were lower for control treatment (23.4 g) than for antibiotic treatment (26.9) (P<0.01), lower for supplemented garlic treatment (26.5 g) and lower than for supplemented ginger treatment (25.2 g) (P<0.001) and higher for males (27.5 g) than for females (23.3 g) (P<0.01). However, there was no significantly difference between antibiotic supplemented treatment and garlic and ginger supplemented treatment. Feed conversion ratios (FCR, kg feed /kg gain) was lower for the antibiotic, garlic and ginger supplemented treatments compared to the un-supplemented treatments (P<0.001). Total tract digestibility of the DM content of garlic, ginger, antibiotic un-supplemented and antibiotic supplemented treatments was 83.7%, 81.5 %, 74.7 and 76.6 %, respectively and significant higher for the garlic and ginger supplementation compared to the with and without antibiotic supplementation. Supplementation of dried garlic and ginger to diets led to improved total tract digestibility and performance and reduced feed costs of broiler chickens.