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The objective of this study was to compare two models for the estimation of producingvalues (EPV) for lactation yields of milk, fat and protein, and calving interval (CI), whichwere combined in an index called the Cow Culling Merit Index (CMI), in Irish dairy cattle.Data comprised 188 927 records for production and 157 117 records for CI, collected onNorth American Holstein Friesian (HO), Friesian (FR), Jersey (JE), and Montbéliarde (MO)pure breeds, and some of their crosses. Cows calved from 2002 to 2006 and were fromparities 1 to 5. Coefficients of specific heterosis for HO×FR, HO×JE, and HO×MO werecalculated for each cow from parental breed information. The coefficient of generalheterosis (GH) for each cow was obtained as the sum of the specific coefficientspreviously estimated. Model 1 included fixed effects of contemporary group, age atcalving within parity, linear regression on gene proportions for FR, JE, and MO, and linearregression on the coefficient of expected GH. Additive genetic, permanent environmental,and error were random effects. Model 2 was based on Model 1 but GH was replaced bylinear regressions on coefficients of expected specific heterosis for HO×FR, HO×JE, andHO×MO. Estimated producing values were calculated as the sum of estimated breedingvalue, permanent environmental and heterosis effects. The inclusion of coefficients ofspecific heterosis in the model did not produce re-ranking of animals but importantdifferences in EPVs were observed in crossbred cows. These changes are important if EPVsare used to develop a culling merit index

Calculation of a cow culling merit index including specific heterosis in a multibreed dairy population