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이성수,정재경,박노형,원유석 ( S . S . Lee,J . K . Jung,N . H . Park,Y . S . Won ) 한국축산학회 1997 한국축산학회지 Vol.39 No.2
Twenty steers and 20 bulls averaging 7 Mo. of age were employed to investigate the effects of casrration on the carcass characteristics, serum metabolites and hormones of Korean cattle from 7 Mo. to 25 Mo. of age. Dressing percent(P$lt;0.05), cold carcass weight(P$lt;0.01) and longissimus dorsi area(P$lt;0.01) of bulls and steers were 57.6±0.44; 58.6±0.36%, 306.9±0.97; 344.9±0.51Kg and 74.3±0.97; 84.7±0.15㎠, respectively. Steers had more marbling score than bulls(4.4±0.11 vs 1.5±0.22; P$lt;0.01). Differences between bulls and steers in serum insulin-like growth factor-1(IGF-1) concentrations and testosterone, stimulate protein synthesis and growth, were large(P$lt;0.01) after 15 Mo. and 9 Mo. of age, respectively. Serum cortisol concentrations had increased rapidly at 19 Mo. of age both in bulls and steers. Steers had higher cortisol concentrations, stimulate lipid metabolism and deposit of intermuscular lipid, than bulls. These results suggested that castration would be extended after 15 Mo. of age to increase beef quality and to conpensate the loss of weight gain due to castration.
이스트컬쳐(Yeast culture) 급여가 한우의 성장과 도체형질에 미치는 영향
원유석,이성수,정재경,박노형 한국축산학회 1997 한국축산학회지 Vol.39 No.4
Two groups of 20 bulls and 20 steers averaging 9Mo. of age(10 supplemented with yeast culture, YCS and 10 control, C in each group) were used to determine the effect of yeast culture supplementation on growth and carcass traits in Korean cattle. Yeast culture add to diet 20g/d/head during 11∼13Mo. and 15 -17Mo. and 25g/d/head during 20∼22Mo. of age in YCS. Weights at 26Mo. of age were 604.1±16.5, 592.7±16.5 and 538.0±13.5, 515.6±13.5Kg in YCS and C in bulls and steers, respectively. YCS had 1.9% and 4.3% advantage in weight over in bulls and steers. YCS did not affect meat quality grade but affect yield grade in bulls. In contrast, YCS in steers did not affect yield grade but were 5.7㎠ larger in longissimus dorsi area(YCS : 70.5㎠, C : 64.8 ㎠) and 273,138 Won higher in price per head than the counterparts. It appears that the effect of yeast culture supplementation was great in steers but not in bulls.
제라놀(Zeranol) 처리가 한우의 성장 및 혈청대사물질에 미치는 영향
원유석,이성수,정재경,박노형 한국축산학회 1997 한국축산학회지 Vol.39 No.4
Twenty calves averaging 7Mo. of age were used to study the effect of zeranol implants(ZI) on growth, carcass traits and concentrations of hormone and serum metabolites in bulls and steers of Korean cattle. The animal were treated with none or three implants of zeranol at average ages of 7, 10 and 13Mo. There were significant(P$lt;0.05) differences between bulls and steers of control group in live weight, back fat thickness(BF), cold carcass weight and yield grade index. In steers, ZI increased serum IGF-1(Insulin-like growth factor-1) concentration, and resulted in greater live weight(10.5%) and BF(25.4%) compared to those of control. However, it did'nt affect marbling scores(P$gt;0.05). ZI in bullls tended to increase cortisol concentration, marbling scores and BF. The results indicate that zeranol implants had more advantage in steers than in bulls.