Polymorphism Analysis of MSTN Gene Exons of Ganzhou Simmental Cattle in Gansu Province Analysis of Genomic Structure and Introns of SoNIN1 Gene from Sugarcane Genetic Variation Study of NGB Gene Exon 3 of Simmental Cattle Hybrid Taxon in Gansu Hexi Regions Analyzing Polymorphism of SLA-DQA Gene Exon 2 in the Hezuopig