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Estimation of additive and non-additive genetic effects on production traits and somatic cell scores in crosses among Holstein-Friesian, Jersey and Australian Red cattle



Estimation of additive and non-additive genetic effects on production traits and somatic cell scores in crosses among Holstein-Friesian, Jersey and Australian Red cattle



Proceedings of the 8th World Congress on Genetics Applied to Livestock Production, Belo Horizonte, Minas Gerais, Brazil, 13-18 August 2006: 01-02



Crossbreeding effects were estimated for milk yield traits and somatic cell score (SCS) for the first three lactations. 305-day data were from 344 643 cows since 1974. Test-day data consisted of 1 170 000 test-day records. Estimates of heterosis from 305-day data were 6%, 8%, 7% and 4% for milk, fat, protein yield and SCS, respectively. Similar results were obtained from test-day data. Maternal effect was positive and significant for both Jersey and Red breeds.

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