International genetic evaluation of dairy breed bulls in Latvia
2010
Sarma, R., State Agency Agricultural Data Centre, Riga (Latvia)
Since May of 2007 Latvia is participating in the international evaluation for dairy production traits of Red and Holstein breeds. International evaluations have become an internationally accepted standard for evaluation of AI bull for domestic and global use. International evaluations play a major role in the exchange of genetic material between countries. The aim of research is to compare EBVs from the Interbull routine run results to those from national evaluation system. Tasks: estimation of mean difference, correlations and reliabilities between national and Interbull EBVs. State agency Agricultural data centre is organizing milk recording in Latvia and is responsible for the genetic evaluation of dairy cattle. The random regression test day model developed in Germany by Vereinigte Informationssysteme Tierhaltung w.V. (VIT) is the official method for breeding value estimation of productivity traits and somatic cell count since 2007. The bulls selected for this study have passed national genetic evaluation in December 2009 and the international genetic evaluation in January 2010. The average results of the each breed group were calculated for 363 bulls born in the period 1981 to 2005, int. al. 154 Holstein Black and White (B and W), 47 Holstein Red and White (R and W) and 162 Red breed bulls.
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