Are in-line measurements of somatic cell counts equally or more useful for genetic evaluations as those from DHI?

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The aim was to estimate and compare genetic parameters for logtransformed
somatic cell counts (SCC) based on in-line measurements (OCC, DeLaval) in automatic milking systems with monthly test-day SCC from traditional herd testing schemes. Data was collected during a 29-mo interval from 6 herds and 1294 first parity cows (5 to 305 d in milk). Cell counts were analyzed using a 2-trait linear animal model. There were a total of 298,988 records for OCC and 7779 for test-day SCC. The fixed part of the model included lactation curves fitted as a Wilmink function, and the random parts included animal and herd-testday effects. Age at calving and days in milk was included as covariates.
Estimates of heritability were similar for the 2 traits, h2 = 0.26 and 0.25 for OCC and SCC, respectively, and the genetic correlation between the 2 traits was close to unity (rg = 0.98). The results suggest that somatic cell counts based on in-line measurements are similar but not preferable to traditionally obtained SCC despite several OCC measurements per cow per day
TidsskriftJournal of Animal Science
NummerSuppl, 3/J
Sider (fra-til)682-682
Antal sider1
StatusUdgivet - 2012
BegivenhedADSA-AMPA-ASAS-CSAS-WSASAS Joint annual meeting - Phoenix, Arizona, USA
Varighed: 15 jun. 201219 jun. 2012


SeminarADSA-AMPA-ASAS-CSAS-WSASAS Joint annual meeting
ByPhoenix, Arizona

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