Study Of Chinese Herbal Medicine Feed Additive And Its Mechanism On Broiler's Weight Gain And Anti-disease Ability

In order to evaluate the performance and immune function on broiler chickens, we made up a pure Chinese herbal medicine additive "Rou-ji-bao(Prescription I )"and "Chu-ji-bao (Prescription II)"in accordance with broiler's physiological characteristics in their different periods. During the feeding trial, the effect of Prescription (P) I and P 11 on broiler's performance and immune function were observed in their different periods. In order to investigate its mechanism of action, some indexes such as the nitrogen baIance~ dry-matter digestibility of a feed (DMD ) uric acid (UA )~ blood urea nitrogen (BUN )~ T3 and T4 of peripheral blood. growth hormone (GH ), duodenum's stmcture and its movement were detected. Meanwhile, the effect of P I and P II on the testing broilers?HI antibody titres and the positive rate of I lymphocytes were investigated. The results of the series experiments were listed below: I. Growth rate and meat-feed rate were significantly enhanced (P<0.0I ) , nitrogen deposition rate and dry-matter digestibility of the food were increased (P0.05) . P I and P II made the positive rate of T lymphocytes higher than that of control group on 6th day and 15th day post second immunization(P<0.05). 5. In in vitro bacteriostasis studies, the diameter of antibacterial action by P I to Escherichia coli were 13.5cm, but P11 showed no antibacterial activity. 6. The LD~ of P 1 and P 11 was more than 21 .5g/kg body weight, no side-effect was observed. This prescription is safe and reliable to use.