HOX genes and chinese cattle

This article published in Gene caught my interest as it relates to the evolution of body size.  The SIX4 gene is critical to muscle regeneration and the early stages of ontogeny.  Transcription factors for it also correlate with body size measurements such as withers (shoulder) height, back fat thickness, chest depth and circumference, and loin area.  While all this is mostly motivated by economic reasons, its ties to overall body size are interesting as well.  This study found 7 SNPs in the promoter region for SIX4 which ultimately lead to 18 transcription factor compositions.  Two of the resulting polymorphisms were correlated with higher fat content and generally larger cattle.  I would be interested to see if these transcription factors correlate to overall body size and/or fat content in primates as well.