Genetic parameters for the semen characteristic traits volume, density (before and after 2013), and motility (in fresh samples and after storing for 24 and 48 hours) were estimated by restricted maximum likelihood applied to an animal model using records from young Norwegian Red bulls (10 to 14 months old). Number of observations per trait varied from 14905 for volume to 4002 for motility 48 hours. Each bull had between 1 and 9 observations per trait and the pedigree consisted of 27437 animals. Volume and density after 2013 had moderate heritability (0.14, 0.15), while density before 2013, a categorical trait, had lower heritability (0.07). Motility (0, 24 and 48 h) also had lower heritabilities (0.03, 0.06 and 0.09). The heritability of motility seemed to increase with time stored. Key words: semen characteristic, andrology, Norwegian Red, cattle
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Biology - Reproduction 2, , 772, 2018
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