Study on the effects of essential oil of Thymus vulgaris after administration of the LaSota vaccine on histopathological status of the trachea, humoral immune system and the performance of broilers

Subject Areas : Veterinary Clinical Pathology

saman  faramarzi ¹ (دانش‌آموخته دانشکده دامپزشکی، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران.)
arash  khaki ² (دانشیار گروه پاتوبیولوژی، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران.)

Received: 2014-03-07 Accepted : 2015-12-21 Published : 2015-11-22

Keywords: Newcastle disease, Thyme herb, LaSota vaccine,

Abstract :

   Thyme is a herb with effects on the respiratory system. The aim of the current study was to investigate the effects of thyme essence on trachea, humoral immunity, and the performance of broilers following LaSota vaccination. In this study, 300 Ross 308 broiler chicks were divided into 3 groups of 100 chicken. The first group received 50 ppm thyme essence 2 days prior to and after LaSota vaccination. In the second group only LaSota vaccine was used, and in the third group B1 vaccine was used to compare its severity to the LaSota vaccine. Finally at the end of production period (42 days) samples were taken from trachea for histopathology and also titer of Newcastle vaccine and the performance of chicks were investigated. Results of this study showed that thyme essence decreased histopathologic changes due to vaccination reaction in the trachea. Histopathologic alteration was not observed in B1 vaccination group. In view of feed conversion ratio, feed consumption and final body weight in thyme group there was significant improvement in comparison to LaSota group (p<0.05). But use of thyme essence did not have any effect on titer of LaSota vaccine, although mean antibody titer in B1 vaccine group was significantly lower than the other two groups (p<0.05). Based on the results of our study, thyme essence improved the performance of broiler chicks and decreased hemorrhage, necrosis, and edema of the trachea due to LaSota vaccine reaction.

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