AR and obesity due to melanocortin 4 receptor deficiency: We have developed the first assay for massive genotyping of variants with high functional potential in swine TASR and AR genes, and we now seek to perform association analysis on pig populations with phenotypic records for eating attitude, feed intake, growth, obesity, but also on semen quality and fertility, infection and immunity and behaviour abnormalities such as stress-related stereotypies and tail biting.