Effects Of Chinese Traditional Herbs "SHENGJIANG No.1" On Growth Performance, Anti-disease Ability, Meat Quality Of Broilers And Approach To The Mechanism

This experiment was conducted to investigate the effects of Chinese herbs feed additive "SHENGJIANG No. 1" on growth performance, ability of anti-disease, meat quality of broilers, and also studied the possibility of replace antibiotic with "SHENGJIANG No. 1" in broiler's feed.The experiment was divided to early period and later period. 500 1-day AA broilers (healthy commercial broilers in the mixed-sex) were allocated randomly into 5 groups with 100 broilers per group. Each group had 4 replicates and per replicate with 25 broilers. Group 1 was fed basal diet without antibiotic and Chinese herb feed additive as control, group 2 was fed basal diets adding 50mg/kg chlortetracycline, and group 3, 4, 5 were fed basal diets with 0.1%,0.2% and 0.3% "SHENGJIANG No.1" respectively. All broilers were given access to feed and water ad libitum during the experimental period. Room temperature was controlled at 33-35℃during 0-2 weeks. After that, the temperature declined 2℃per week, and then kept at 21-23℃after 4 weeks. All broilers were given 24 hours of artificial lights in the early period (0-3 weeks) and 23 hours in the later period (4-6weeks). Immunity program was performed according to general management requirement.4 broilers (2 males and 2 females) were selected from each replicates after the feeding experiment, total 80 animals were slaughtered and executed carcass division by routine method, and breast and leg muscles of broilers were selected to measure meat quality including pH, meat color, meat tenderness, the contents of water, protein and fat in muscle.The results of feeding experiment showed that ADG during 0-6 week and F/W ratio in the group adding 0.2% "SHENGJIANG No. 1" were improved 3.03% and 4.13% respectively, compared with that in the control group(P＜0.05%).The result of slaughtering experiment suggested that the HPTP of broilers in "SHENJIANG No.1" group 2 was significantly lower than that in other groups(P＜0.05), the WPTP of broilers in "SHENGJIANG No.1" group 1,2,and 3 were significantly higher than that in control group and chlortetracycline group (P＜0.05), while there was no difference between control group and chlortetracycline group. The breast muscle rate and leg muscle rate in "SHENJIANG No.1" group 1,2,and 3 were significantly higher than that in control group (P＜0.05), there was no difference between control group and chlortetracycline group(P＞0.05) while "SHENJIANG No.1" group 2 had highest breast muscle rat and leg muscle rate. There is no difference in average fat rate among groups.Meat quality examination suggested that there were no significant difference among PH values ,meat color ,meat protein content in all groups (P＞0.05) ,however there were significant difference among all "SHENGJIANG No. 1" Chinese herb groups and chlortetracycline group (P＜0.05) .Muscle fat content and muscle tenderness in group 2 significantly higher than that in other groups (P＜0.05) ,while muscle moisture significantly lower than that in other groups (P＜0.05).The results of anti-infection showed that the broilers fed with 0.2% "SHENGJIANG No. 1" had lower mortality rate than that fed with Roxithromycin after inoculated with E.coli. and salmonella. The 0.2%"SHENGJIANG No.1" showed the effect in preventing E.coli. and salmonella infection in broiler chickens. Adding 0.2% "SHENGJIANG No. 1" may substitute chloroteracycline in broiler feed to prevent disease induced by E.coli., and the high dosage group(0.3% "SHENGJIANG No. 1") may be used as treatment dosage due to its better prevention and cure effect than chloroteracycline.In a word, 0.2% "SHENGJIANG No. 1" supplementation can improve the growth performance, carcass quality and anti-disease ability of broilers , exerting the function of replacing antibiotic.