The heritability for lactation length was 0.15 (Table 1), which indicates small possibility of direct selection for the trait. Several studies have reported lower values than this: 0.08 (REML) for crossbred buffaloes (Malhado et al., 2009), 0.10 (REML) for Murrah buffaloes (Rodrigues et al., 2010) and 0.10 (BI) for the Jaffarabadi breed