Selection Differential and Predicted Genetic Gain in Tectona grandis

In a study of 80 batches of teak trees, selection differential and predicted genetic gain values were estimated. This involved individual character variation analysis, estimation of heritability and computation of predicted gain values. Predicted gain values were estimated for individual batches along with an overall estimate. Some individual batch values (predicted gain) were found to be higher and the upper 5% values of overall batches were substantially high tban the overall meanestimate of the predicted gain values. This along with 20% selection intensity, significantly different mean-square values and high heritability assure shifting of the mean towards the direction of selection. The hatches with higher predicted gain values were indicated for use in the mass clonal multiplication programme and also for further selective breeding and improvement.