Alternative models for QTL detection in livestock. II. Likelihood approximations and sire marker genotype estimations Brigitte Mangin, Bruno Goffinet, Pascale Le Roy, Didier Boichard and Jean-Michel ElsenGenet. Sel. Evol., 31 3 (1999) 225-237DOI: https://doi.org/10.1051/gse:19990303