Abstract
S.W.Kim*,S.H.Choi*,B.D.Sang*,Y.K.Kim*,C.H.Yoo*andK.W.Seo**NationalLivestockResearchInstitute,R.D.A.*,DepartmentofDairyScience,ChungNamNationalUniversity**ABSTRACTThe study was conducted to determine the effects of hormone injection on casting day of antler, velvetantler yield, and blood hormone concentration in elk deer and Sika deer. The study revealed that thecasting day of Elk and Sika deer at medroxy progesterone acetate(MPA) injection averaged 21 days afterMPA injection, which was earlier 38 and 24 days, respectively, compared control(P<0.01). The regrowthof antler in bothSika deerandElkoccurredintheMPA injectionand theduration ofantlergrowthwas2times longerthancontrol. The totalyield of velvetantlerofElk inthe control andMPA injection was7.31 and 10.11kg and the that of sika deer was 1.00 and 1.41kg, respectively. Blood testosteroneconcentration of Sika deer and Elk was less than 4.0ng/ml for both at the casting and during the antlergrowing. Blood IGF-1 concentrations of Sika deer and Elk during the antler growing tended to increasewiththesameasgrowthcurveofantler.(Keywords :Velvetantler,casting,MPA,Hormone,Yield)
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