Rentabilities of trotting performance traits for early career and annual records were estimated using the animal model REML. Obtained estimates were somewhat higher than those by the sire model and Henderson’s method 3 in the literature. Heritability estimates for early career records were distinctly higher than estimates for annual records, but were probably overestimated. 

J. Poso, M. Ojala, V. Vilva

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 471–474, 1994
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