Effect of two types of oils on white blood cells function in  broiler after Newcastle disease vaccine

The Newcastle disease is an important disease problem that affects the Poultry industry because it causes large economic losses, many types of vaccines against Newcastle are widely used to provide protection. additives were used including flax seed and fish oils as food supplements and improved the immune system. This study aimed to estimate the effect of adding some essential oils (1% flax and fish oils) to the broiler diet on the white blood cell number and function after vaccination with the newcastle disease vaccine. A total and differential white blood count was done by using an automatic blood analyzer, while the phagocytic index and respiratory burst were used to detect its function. Our results show that there was an increase in total and differential white blood count in all treated groups but remained in their normal ranges in broiler, the heterophilia decreased, while lymphocytes increased with the processing of experiment time; the monocyte, eosinophilic, and basophilic percentages showed little response and reached up to 0.7, 4.1, and 0.2 %. phagocytic index and respiratory burst reveal a significant increase in all treated groups compared with the control. From our study, we conclude that the use of oils can improve total white blood counts as well as increase their ability to phagocytic and kill activity