Growth Performance and Immune Status of Broiler Chickens Fed Graded Levels ff Methionine Supplemented Diets.



The growth performance and immunological response to Newcastle disease vaccinations of broiler chickens fed varying levels of methionine supplemented diets were investigated in this study. A total of two hundred (200) birds were raised from day-old to eight weeks. They were distributed into four treatments A, B, C and D with 5 replicates per treatment, each replicate having 10 birds. There were four experimental diets; Diet A was the control diet and contained a standard of 0.37% methionine, diet B was the diet containing 0.5% methionine as recommended by National Research Council (NRC) while diets C and D contained 0.55% and 0.58% methionine supplementary levels which were 10% and 15% increment over NRC requirement respectively. Results showed that the weight of birds fed 0.5% and 0.55% methionine were not significantly different (P greater than 0.05) but were significantly (P less than 0.05) higher than those fed the other test diets. The birds on 0.55% and 0.58% methionine best utilized their diets, better than those fed the NRC required methionine. The immunological responses after vaccination with Newcastle disease vaccine intra-ocular (NDV i/o) revealed that chickens fed with 0.55% methionine recorded the highest antibody titre value (log 28) while those fed the control diet had the lowest mean titre value (log26). Also, administration of NDV LaSota and infection with ND antigen elicited immune responses that were highest in birds fed diet containing 0.5% methionine with antibody titre values of log29 and log210 respectively. The haematological parameters were only significantly (P less than 0.05) different for packed cell volume (PCV), haemoglobin concentration (HB), mean cell volume (MCV) and mean cell haemoglobin (MCH) values while only the total serum protein was significantly (P less than 0.05) affected among the serum metabolites measured. It was concluded that supplementing methionine above NRC requirement at 10% compared well with that of NRC requirement with respect to performance characteristics and immune response in broiler chickens.

Keywords: Immune response, performance characteristics, antibody titre, methionine.

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