Application of partial diallel designs to estimate cross breeding parameters in broiler

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)

Estimation of crossbreeding parameters for testing and identifying the superior cross combination is an important step in commercial poultry breeding programme. However conducting diallel cross considering all possible combination of parental lines may be time consuming, labor intensive and costly. Therefore partial diallel design with reduced number of purebred and crossbred combination may be a suitable alternative. In the present study of partial diallel experiment, the parental populations were divided into two sets. The first set consisted of two synthetic male lines while the second set included two synthetic female lines of broiler. These two sets of parental populations constituted four types of experimental designs. The models on general genetic model and combining ability model corresponding to complete diallel models of Eisen et. al. (1983) and Griffing (1956) were investigated. The body weight data at six-week of age were recorded for evaluation of these partial diallel models. The results indicated that variation due to different crossbreeding parameters like average heterosis, specific heterosis, maternal ability and residual reciprocal effect were almost similar in magnitude for both the general genetic model and combining ability model. A comparative analysis of different crossbreeding parameters under complete and partial diallel designs showed that the partial diallel design could rank the parameters almost similar to that of complete diallel design. However, some parameters that showed significant mean squares under complete diallel could not reveal so in case of partial diallel experiment. In general, it may be concluded that partial diallel design may give important information about crossbreeding parameters when it is not feasible to conduct complete diallel experiment.

Source : IPSACON-2005

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