Agarose electrophoresis detection of GHSR-3 and GHSR-4; Note: M: marker DL2000,1ˎ6ˎ7: Large tailed han sheep, 2ˎ8ˎ9ˎSmall tailed han sheep, 3ˎ10ˎ11ˎYuxi fatty tailed sheep, 4ˎ12ˎ13ˎDorper sheep, 5ˎ14ˎHu sheep.