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- Nixon, M.; Bohmanova, J.; Jamrozik, J.; Schaeffer, L.R.; Hand, K.; Miglior, F.
- Journal of dairy science 2009 v.92 no.7 pp. 3422-3430
- dairy cows; estimation; milk protein yield; mathematical models; lactation stage; milk composition; calving; genetic correlation; automation; milking frequency; milking machines; Holstein; milk fat yield; genetic variance; heritability; somatic cell count; quantitative traits; Ontario
- ... Twice-a-day milking is currently the most frequently used milking schedule in Canadian dairy cattle. However, with an automated milking system (AMS), dairy cows can be milked more frequently. The objective of this study was to estimate genetic parameters for milking frequency and for production traits of cows milked within an AMS. Data were 141,927 daily records of 953 primiparous Holstein cows fr ...