| Abstrakt: |
The aim of this experiment was to investigate and compare the effectiveness of the microencapsulated of medicinal plant extracts and raw extracts of six plants involved thyme, oregano, rosemary, fennel, turmeric and peppermint on growth performance, carcass components and immune response of broilers. In invitro condition, the extracts were microcoated with different ratios of carbohydrate wall (1:10, 1:15 and 1:20). The results showed that the ratio of 1:10 microencapsulated is more efficiency in terms of quality indicators. For this experiment, 650 one-day-old chicks of ROSS 308 were used in a completely randomized design with 13 treatments, 5 replicats and 10 birds for 42 days. The amount of 600 mg/kg of raw extract and 6.6 gr/kg of microencapsulated extract of plants was added to the rations in a mixed component. Data on feed intake, weight gain and feed conversion ratio were recorded in periods of 0-10, 11-24 and 25-42 days. On the seventh day of the experiment, Newcastle and influenza vaccines were injected, and at the 35th day, one bird from each replicate were bleeding and the antibody titer was measured. The results showed, as compare to control, treatments containing a microencapsulated extracts increased body weight in the starter and grower periods, and improved the FCR in the starter, grower an d whole period of experiment(P<0.05). However, the treatments containing raw and microencapsulated extract had no effect on feed intake. The treatments of raw and microencapsulated extracts increased the relative weight of carcass and abdominal fat, but had no effect on the antibody titer against Newcastle disease and influenza. Therefore, the addition of different proportions of microcapsule extract may improve the growth performance of broiler chickens. [ABSTRACT FROM AUTHOR] |
