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농후사료 급여수준이 비거세 한우의 증체와 부위별 지방조직의 지방산 조성에 미치는 효과
송만강,김내수,정정수,최양일,원유석,정재경,최성호 ( M . K . Song,N . S . Kim,C . S . Chung,Y . I . Choi,Y . S . Won,J . K . Chung,S . H . Choi ) 한국축산학회 1998 한국축산학회지 Vol.40 No.5
The study was conducted with 63 Hanwoo bull calves of 193 days old for 19 months(up to 26 month of age) to examine the effect of feeding level of concentrate on the body weight gain, feed requirements and fatty acid composition of adipose tissues of various locations(subcutaneous, abdominal, kidney, intermuscular and intramuscular fats). The calves were allotted into 3 treatments according to the feeding level of concentrate(85, 100 and 115%), and fed concentrates of Grower(7∼10 month of age), Finisher I(11∼16 month of age), Finisher II (17∼20 month of age) and Finisher III(21∼26 month of age). The feeding levels of concentrates for the cattle of 85% and 115% were decreased or increased by 15%, respectively, up to 15 month of age based on the similar body weight to the cattle of 100%. The feeding levels of the concentrates for the cattle of 85% and 100% were continuously increased for the next 2 months, to make same levels as for the cattle of I15%, thereafter amount of concentrate were continuously increased based on the rate of body gain for all the cattle. The cattle were fed in a individual feeding system through the experimental period. The cattle were slaughtered at the ages of 6, 14, 18 and 24 month and adipose tissues were collected to analyze long chain fatty acids. Results observed from the study were summarized as follows Overall mean dry matter intake and body gain per day and feed requirements of Hanwoo bulls during the 19 months of feeding from 193 day old calves were 6.69㎏, 0.95㎏ and 7.06, respectively. Body gain of the Hanwoo bulls during experimental period was greatly affected by the feeding level of concentrate, but feed requirement was improved up to 20 month of age with the decreased feeding level of concentrate. Fatty acids of C_(16:0) C_(18:0) and C_(18:1) in the adipose tissues at various locations of Hanwoo bulls were dominated. The feeding level of concentrate did not affect the fatty acid composition except for C_(16:1) and C_(18:1) in subcutaneous fat, and C_(18:1) and C_(18:2) in intramuscular fat of the cattle that were fed at the level of 85% at the age of 14 month(P$lt;.05). No differences were observed in fatty acid composition of adipose tissues of each location for the cattle of 18 and 24 month of age among treatments. There were tendencies of greater C_(16:1) and C_(18:1) in subcutaneous and intramuscular fats while higher C_(18:0) in abdominal fat. There were also trends of greater unsaturated fatty acid compositions in subcutaneous and intramuscular fats and higher saturated fatty acids in abdominal, kidney and intermuscular fats. Percent C_(18:0) tended to be decreased while C_(16:1) C_(18:1) and C_(18:2) increased with the age of Hanwoo bulls.
고유지 옥수수 급여가 육성 비육돈의 도체특성 , 육질 , 돈육의 지방산 조성 및 콜레스테롤 함량에 미치는 영향
정정수,이재준,정영철,강정선,박홍양,김천제 ( C . S . Chung,J . J . Lee,Y . C . Jung,C . S . Kang,H . Y . Park,C . J . Kim ) 한국축산학회 1998 한국축산학회지 Vol.40 No.4
The current study was conducted to determine the effects of high oil com(HOC) on carcass traits and pork quality as well as fatty acid composition, and cholesterol concentrations of loin muscle. Total 104 pigs(Barrow; 52, Gilts; 52) were fed diets containing typical com plus animal fat(control) or high oil corn(HOC) replacing typical corn and animal fat for the final 85 days before slaughter. There were no differences in carcass traits and pork quality between pigs fed HOC diet and control diet. The proportion of polyunsaturated fatty acids of loin muscle and loin fat from pigs fed HOC-diets was higher than that of pigs fed by regular com diet(P$lt;0.05). The cholesterol concentration of loin muscle of HOC-diet pigs tended to be lower than that of the control diet pigs.
정정수(C . S . Chung),이택원(T . W . Lee) 한국축산학회 1988 한국축산학회지 Vol.30 No.1
The current study was undertaken to determine the effects of porcine growth hormone (pGH) administration on lipogenesis in rats. Growing male rats were injected (SC) with either pGH (1 ㎎/head) or bicarbonate buffer for 14 days. After last injection, rats were killed and epididymal adipose tissues were removed and sliced. Sliced tissues were incubated for one hour in KRB buffer containing various concentrations of porcine insulin and C^(14)-glucose. Lipogenesis, determined as glucose conversion to total lipids, was significanlay (P◎0.05) decreased in pGH - treated rats.
정정수(C . S . Chung),권관(K . Kwon),한규범(K . B . Han),김인수(I . S . Kim) 한국축산학회 1989 한국축산학회지 Vol.31 No.11
The present study was undertaken to determine the effects of recombinant porcine growth hormone(rpGH, supplied by Lucky, Ltd., Korea) on growth performance of growing pigs. Twelve barrows with an average initial live weight of 48kg were allocated to either control group(n=6) or rpGH group(n=6). Recombinant rpGH (70ug/kg BW) or vehicle was injected in the extensor muscle daily for 49 days. Pigs were fed a diet containing 16.45% of crude protein and 0.85% of lysine. As expected, serum rpGH was elevated by rpGH injection. Administration of rpGH increased average daily gain by 6%(1.04 vs 1.11kg), improved feed/gain by 10%(3.203 vs 2.895; p $lt;0.05), decreased backfat thickness by 19%(3.60 vs 2.91cm; p $lt;0.01), and increased loin eye area by 5%(36.84 vs 38.53㎠). These results indicate that rpGH administration improves swine growth performance, suggesting that considerable potential exists for development of a GH-based growth promotant for the swine industry.
성장흐로몬이 돼지 지방조직의 지방합성에 미치는 영향 뇌하수체성장호르몬과 유전공학성장호르몬과의 비교
정정수(C . S . Chung),권관(K . Kwon),김인수(I . S . Kim) 한국축산학회 1990 한국축산학회지 Vol.32 No.12
The current study was undertaken to determine whether porcine growth hormone(pGH) inhibited lipogenesis in swine adipose tissue, if so to compare pituitary pGH(ppGH) and recombinant pGH(rpGH). Vehicle(control), ppGH or rpGH (70ug/kg BW) was injected daily into barrows weighing 85kg for 7days. Following the 7 day treatment, subcutaneous adipose tissue biopsies were taken and explants of ∼ 10mg wet weight were prepared. The explants were incubated in KRB buffer containing various concentrations of insulin for 2 hours for measurement of lipogenesis. Basal and insulin-stimulated lipogenesis were markedly decreased in adipose tissues from ppGH and rpGH-treated pigs, compared to those from control pigs. These results partly explain the mechanism by which pGH administration reduces carcass fat in the growing pigs.
성장호르몬이 인슐린의 돼지 Liver Microsomes 에의 Binding 에 미치는 영향
정정수 ( C . S . Chung ) 한국축산학회 1987 한국축산학회지 Vol.29 No.8
The current study was undertaken to determine the effects of porcine growth hormone (pGH) administration on insulin binding to swine liver microsomes. Liver microsomes were prepared from pigs, injected with either pGH (22ug/Kg BW) or bicarbonate buffer for 30 days. Insulin binding was measured by incubating 250ug of microsomes protein with I^(125)-insulin and various concentrations of unlabeled insulin in 50 mM Tris buffer for 24h at 4℃. Porcine GH administration had no effects of insulin binding to liver microsomes with a decrease in receptor concentration and a compensatory increase in receptor affinity. These findings suggest that GH induces insulin resistance at post-receptor levels.