A polymerase chain reaction(PCR)-based method for cattle SRY-Specific sequence was established.A pair of primers of 22 bases in length were designed based on regions of sequence homology among cattle,pigs,goats and sheep to amplify a 163-bp region of cattle SRY.Genomic DNA extracted from male and female cattle were directly used as template of PCR.Optimal PCR conditions for cattle SRY developed by using 3×2×3 factors combination.Using optimized PCR condition for designed primers,genomic DNA from twenty catt...