THE EFFICIENCY OF BETWEEN AND WITHIN FULL-SIB FAMILY SELECTION IN A RECURRENT SELECTION PROGRAM IN SUGAR-BEET (BETA-VULGARIS L)

The efficiency of between and within family selection in a full-sib fa mily recurrent selection programme was investigated using data from th ree cycles of recurrent selection. Correlations between mid-parent val ues and offspring were high for sugar content and juice purity charact ers, but low for root weight and sugar yield. This suggests that singl e root selection within full-sib families is effective in the improvem ent of sugar content, and juice purity, but ineffective for root weigh t and sugar yield. Root weight and sugar yield will respond better to between full-sib family selection.