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Litter size in sheep can be improved by introgression of the FecB gene. Genetic markers closely linked to theFecB locus can be used to detect gene carriers. The efficiency of introgression can be increased by using markerassisted selection. Individuals of the prolific breeds Tyrolean Mountain sheep (n = 41), Romanov (n = 43), EastFriesian Milksheep (n = 35) and Merinoland sheep (n = 265) were genotyped with the microsatellite markersOarAElOl and BMI 329 linked to the FecB gene to estimate allele frequencies of both microsatellites in thesebreeds. The frequencies of the microsatellite alleles linked to the FecB gene in Merinoland sheep were 0.07 and0.1 respectively. The alleles occured also in the other breeds (Tyrolean Mountain sheep, Romanov and EastFriesian Milksheep) but with mostly higher frequencies. Furthermore the segregation of the microsatellite alleleswas studied in families produced by mating Merinoland sheep ewes (Fec+/Fec+) with two heterozygousBooroola Merino rams (Fec+/FecB) in order to use these markers within an indirect gene test. The recombinationrate between BM 1329 and OarAElOl was 13 cM (LOD score 14.6)

archives animal breeding/archiv für tierzucht

Suitability of microsatellites BM1329 and OarAElOl as markers for the introgression of the Fec&amp;lt;sup&amp;gt;B&amp;lt;/sup&amp;gt; locus into different sheep breeds