P.Goudarzi, A. Nikkhah, P. Shawrang, M. Chamani
Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Iran
Nuclear Agriculture Research School, Nuclear Science and Technology Research Institute, Atomic Energy Organization of Iran, Karaj, Iran
Key words: Different fat source, performance, Antibody titre, H;L ratio, chicks.
A study was conducted to investigate the effect of different sources of lipid on performance indexes and immune responses in broiler chicken. Four hundred and twenty four one-day-old broiler chicks (Ross 308), randomly divided into five treatments as a completely randomized design, consisting four replicates of 21 birds per each. Chicks were assigned to receive one source of lipid either tallow or corn oil or sunflower oil or flaxseed oil or olive oil in their diet. Antibody titre against IBD (Gumboro) and IBV (Bronchite) and Heterophile to Lymphocyte (H/L) ratio as indexes of immune responses, at days 28 and 42 of age and feed conception, weight gain and feed efficiency at whole of period, as indexes of performances, were measured. The diet contain corn oil, showed the best performance indexes with significant different than other treatments (P<0.05). In comparison of diet consists of corn oil, flaxseed oil containing high ratio of n-3 PUFA, had a higher H:L ratio (P<0.05). Result indicated that antibody production in chicks fed flaxseed oil against IBV at day 28 and against IBD at day 42 of age were less than the other chicks. Although the chicks fed Sunflower oil showed lower antibody production against IBD at day 28 of age. In this study, it was concluded that the use of flaxseed oil as only source of lipid in diet can result in decreased antibody production because of lower efficiency of energy usage. Also H:L ratio was affected by lipid source and corn oil among used lipids had the lowest H:L ratio and higher performance indexes, that is useful for wellbeing and health of broiler chicks.
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