Effect of supplementation of herbal product on the production potential of chickens
MANOJ KUMAR AND K.C.P.SINGH
Department of Veterinary Microbiology
Bihar Veterinary College , Patna – 800 014
Intensive production system having an objective to exploit the maximum genetic potential of farm animal, imposes varied level of stress. The reaction of animal to stress results in altered homeostatic balance and immunosuppression. Consequently the production level declines and the affected animal becomes susceptible to various infections. The appropriate curative approach to restore the vitiated homeostasis can be accomplished by feeding herbal products which owes antis tress, adaptoenic and immunogenic properties. An experiment was conducted in order to evaluate the efficacy of amla fruit ( Emblica officinalis ) on the productive on the productive performance of broiler chicken. Hundred, day-old broiler chicken of hubbard strain were selected for study. The birds were divided randomly into two equal groups and were given identical management and disease control condition. Feed and water were provided ad libitum. Chickens of both the groups were vaccinated against Ranikhet disease (RD) on 5 and 25 day of age by F and LaSota strain, respectively and also against infectious bursal disease (IBD) on 10 day of age by IV 95 strain. Blood samples were collected from five representative birds of each group on 17, 24, 31, 38 and 45 day of age in order to evaluate the humoral immune response against RD and IBD by haemagglutination test (HI) and Quantitative agar gel precipitation test (QAGPT). Cell mediated immune response was evaluated by in contact delayed type hypersensitivity reaction due to DNCB, PHA-P and PPD. Production parameter such as body weight gain and feed conversion ratio were also determined. The mortality during entire experiment of period were recorded. 12 representative birds from each group were challenged at the end of experiment with virulent IBD virus in order to detect the resistance of birds due to effect of feeding amla.
The result revealed a significantly (P<0.05) higher antibody titre to RD and IBD vaccine during entire period of observation in amla feed group as compared to control. Moreover a significantly (P<0.05) higher DTH reaction was recorded in amla fed group. The production was comparatively higher in amla feed group as evidence by higher body weight gain and FCR. The mortality percentage was 0% in treatment group here as 5.0% mortality was recorded in control group. The results of challenge study showed that there was no mortality is amla fed group, as compared to control group where 8.33% mortality was observed.