Periódicos Brasileiros em Medicina Veterinária e Zootecnia

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Effects of dietary fish oil and green tea powder supplementation on broiler chickens immunity

Seidavi, AlirezaAsadpour, LeilaDadashbeiki, MohammadPayan-Carreira, Rita

Background: Poultry strains used by the industry have been submitted to intensive genetic selection for rapid growth and increased effi ciency of feed utilisation along with a high metabolic rate. As major consequences a loss in the immune system competency and increased sensibility to stressors are pointed out. Several nutritional strategies have been essayed to alleviate immuno-suppression in broilers, including the administration of rich 3n- polyunsaturated fatty acids. The purpose of the current study was to investigate the effects of fi sh oil and green tea feeding in broilers chicks humoral immunity using different challenges and the weight of immunity-related organs.Materials, Methods & Results: In the present study, different combinations of fi sh oil (FO) and green tea powder (GrT) supplements were tested in a 3x3 combination of supplement proportions (0%, 1.5% and 2% FO and0%, 1% and 1.5% GrT), in a total of 270 Ross 308 broilers, to analyse the effects of supplementation on the humoral immune response to challenges against Infl uenza and Newcastle virus (antibody titers) and to SRBC (immunoglobulin production) and also in the weight of liver and main lymphoid organs at slaughter. At the end of the study, the carcass weight was similar between groups and to the reported in other studies for the same age at slaughter. On respect to the responses to viral challenges

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