01691nam a2200301 a 450000100080000000500110000800800410001902400510006010000190011124500970013026001120022752007700033965000240110965000130113365000140114665000240116065000100118465000100119465300270120465300180123165300250124970000170127470000200129170000190131170000190133070000220134970000180137115288422025-02-06       2000    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1017/S17527562000004292DOI1 aWALLING, G. A.  aCharacterisation and mapping of the Booroola (FecB) gene using regression analysis in sheep.  aIn: BRITISH SOCIETY OF ANIMAL SCIENCE, 2000, Scarborough, UK. Proceedings... Medlothian, 2000. p. 41.c2000  aThe Booroola Merino strain of sheep carries a major autosomal mutation (FecB) which increases ovulation rate (Davis et al., 1982). To map the gene, heterozygous sires (B+) were mated to non-carrier ewes (++). The female progeny were then examined by laproscopy to determine ovulation rates and these phenotypes used to assign progeny genotypes (B+, ++ or undetermined). Linkage analysis between the assigned Booroola genotype and a set of marker genotypes was used to assign the Booroola gene to a region of sheep chromosome 6 (OOV6) (Montgomery et al., 1994). These studies relied on accurate genotype assignment and a constant gene effect across animals and breeding seasons. This study aims to use regression analysis to verify the validity of these assumptions.  aGenetic improvement  aGenotype  aOvulation  aRegression analysis  aSheep  aOvino  aAnálise de regressão  aGene Booroola  aMapeamento genético1 aDODDS, K. G.1 aGALLOWAY, S. M.1 aBEATTIE, A. E.1 aLUMSDEN, J. M.1 aMONTGOMERY, G. W.1 aMcEWAN, J. C.