Manipulating Growth Performance and Carcass Characteristics of Hanwoo Heifers by Dietary Means during Growing and Early Fattening Period
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This study was conducted to improve growth performance of Hanwoo heifer and to producehigh quality of meat with dietary means during growing and early fattening period. Particularly,additional energy diet to relieve estrus stress was main purpose in this study. The results of invitro rumen fermentation indicated that there was no negative effect by additional energy diet astreatments. In the feeding trial, twenty Hanwoo heifers(average 10 months age) were allocatedand distributed into two treatments in randomized block design based on body weight. Therewere three growth stages such as growing, early fattening and late fattening periods in thisfeeding program, respectively. In growing stage, there were two treatments consisting of onlytotal mixed ration(TMR) as a control and TMR with additional energy treatment. Theexperimental diets were fed twice a day, and water and mineral were freely accessed. Inadditional energy treatment, 500 g of concentrate diet was fed daily to relieve estrus stress dueto obese with high energy intake. Not outstandingly differences were found across the treatmentsduring entiretrial period. While, unexpectedly greater feed conversion ratio in treatment comparedto the control was found during late fattening period. It seems that the blood cortisol decreasedwith addition energy supplementation compared with the control during trail period. Carcasscharacteristics including carcass weight, back fat thickness, marbling score, meat color, fat color,maturity and texture were not significantly different each other. Rib-eye area, however, wasgreater in the control compared to the treatment(p<0.05). In addition, it appears that yield indexwas tended to be greater in the control. In conclusion, it is suggested that additional energysupplementation to Hanwoo heifer could get a potential in improving meat quality and relievingestrus stress.
Abstract
This study was conducted to improve growth performance of Hanwoo heifer and to producehigh quality of meat with dietary means during growing and early fattening period. Particularly,additional energy diet to relieve estrus stress was main purpose in this study. The results of invitro rumen fermentation indicated that there was no negative effect by additional energy diet astreatments. In the feeding trial, twenty Hanwoo heifers(average 10 months age) were allocatedand distributed into two treatments in randomized block design based on body weight. Therewere three growth stages such as growing, early fattening and late fattening periods in thisfeeding program, respectively. In growing stage, there were two treatments consisting of onlytotal mixed ration(TMR) as a control and TMR with additional energy treatment. Theexperimental diets were fed twice a day, and water and mineral were freely accessed. Inadditional energy treatment, 500 g of concentrate diet was fed daily to relieve estrus stress dueto obese with high energy intake. Not outstandingly differences were found across the treatmentsduring entiretrial period. While, unexpectedly greater feed conversion ratio in treatment comparedto the control was found during late fattening period. It seems that the blood cortisol decreasedwith addition energy supplementation compared with the control during trail period. Carcasscharacteristics including carcass weight, back fat thickness, marbling score, meat color, fat color,maturity and texture were not significantly different each other. Rib-eye area, however, wasgreater in the control compared to the treatment(p<0.05). In addition, it appears that yield indexwas tended to be greater in the control. In conclusion, it is suggested that additional energysupplementation to Hanwoo heifer could get a potential in improving meat quality and relievingestrus stress.
참고문헌 (19)
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