Estimation of crossbreeding parameters for humoral response in broilers

M. Nath, B. P. Singh, V. K. Saxena, A. K. Dev Roy and R. V. Singh
Central Avian Research Institute Izatnagar, Bareilly 243 122 (UP)

The main objective of the present study was to estimate the crossbreeding parameters for humoral response in respect to response to sheep red blood cell (SRBC) in broiler chickens. The experiment involved a complete 4 ´4 diallel design using four synthetic broiler lines namely Colored Synthetic Male Line (CSML), White Synthetic Male Line (WSML), Colored Synthetic Female Line (CSFL) and Naked Neck Line (NNL). The SRBC response was evaluated by the method of Siegel and Gross (1980) using haemagglutination test. Responses were measured as the difference in the antibody titer at zero and seven-day post-immunization. In all measurements, data were transformed to log 2 (n+1), where n is the reciprocal of the highest dilution where antigen and antibody reaction takes place. The data were analyzed by least-squares method to find the effects of genetic and non-genetic factors. The crossbreeding parameters involved with this trait were estimated using the complete diallel model given by Eisen et. al. (1983) assuming the effect of each synthetic line as fixed. The results indicated that additive and non-additive genetic variation attributed to polygenes is important for the genetic control of humoral response in broilers. The total non-additive components of variance also indicated significant amounts of heterosis in crossbred progenies, and therefore exploitation of the non-additive component of variance is possible for improvement of humoral response in broilers.

Source : IPSACON-2005

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