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Second and third parity twinning rate of Israeli Holsteins was analyzed by linear (LM) and threshold models (TM). Data were 124 553 calving records of daughters of 179 sires. Twinning rates were 4.8 and 6.9% for second and third parity, respectively. Heritabilities, as estimated by REML for the LM analysis, and the counterpart of REML for the TM analysis, were 2.2 and 10.1%. The correlation betwen LM and TM evaluations was 0.98. Both distributions of sire evaluations were positively skewed, butdoi:10.1186/1297-9686-22-3-349 fatcat:mlyujazp2bdbbfvjokteid3pve