Range of progeny mean values, genetic coefficient of variation (CVg) in three growing conditions (C1, C2, C3), F test results for overall progeny × condition (P×C) interaction, genetic correlation for progeny responses across pairs of conditions, and broad-sense heritability on a mean progeny basis over conditions (h2B), for forage quality traits recorded on dry leaves and stems of 154 alfalfa half-sib progenies.