Fig. 2From: X chromosome variants are associated with male fertility traits in two bovine populationsGenome-wide association studies performed in Brahman only (top), in both breeds together (middle) and in Tropical Composites only (bottom) for sperm mid-piece morphological abnormalities (MA). Significant SNP associations for the percentage of sperm with MA were identified only in Brahman. The significance of the associations decreased when the two breeds were analysed together (fitting breed as a fixed effect in the model). We focused on within-breed GWAS to be able to identify associations, and QTL that are breed-specificBack to article page