다른 광물질과 혼합된 크롬 피콜린산 급여가 비육돈의 성장 , 도체특성 , 혈액성상에 미치는 영향

김지훈,한인규,김진동,김대성,양종석,손현수,현영 한국영양사료학회 1999 韓國營養飼料學會誌 Vol.23 No.5

본 시험은 여러 가지 광물질과 혼합된 크롬 피콜린 산을 첨가한 사료의 급여가 비육돈의 성장, 도체특성, 혈액성상에 미치는 영향을 알아보기 위하여 수행되었다. 개시체중이 69㎏인 총 513두의 비육돈을 돈방당 16∼21두씩 수용하여 사양시험을 수행하였으며, 9마리가 대사시험에 사용되었다. 처리구는 2개의 단백질 수준별 대조구 (Con 12, Cen 14)와 외산 크롬 피콜린산 (CrP-CaCO₃ ; Prince사 제품). 크롬 제오라이트 (CrP-Zeolite 12, 14), 국산 크롬 피콜린산 1 (CrP-CaCO₃; KIST 개발), 크롬 피콜린산-산화아연 (CrP-CaCO₃-ZnO 12, 14) 그리고 국산 크롬 피콜린산 2 (CrP-CaCO₃ ; M. H. Lee 개발)이었다. 성장성적에 있어서는 일당중체량, 일당사료섭취량, 사료효율 등 모든 조사항목에서 처리구간의 차이가 발견되지 않았으나, 등지방 두께는 크롬 피콜린산 첨가에 의해 감소하는 경향이 발견되었고, 이러한 경향은 출하체중이 무거울수륵 뚜렷하게 나타났다. 도체등급은 크롬 제오라이트구와 크롬 피콜린산-산화아연처리구에서 높게 나타났으며, 혈액내 콜레스테를의 함량도 크롬 제오라이트구와 크롬 피콜린산-산화아연처리구에서 대조구에 비해 유의적으로 감소하였다 (p<0.05). 크롬 피콜린산-산화아연처리구와 크롬 피콜린산구에서 건물 및 단백질 소화율이 향상되었다 (p<0.05). This experiment was conducted to investigate the effects of chromium picolinate in different combinations with minerals on growth, carcass characteristics, serum traits and nutrient digestibility in finishing pigs. Five-hundred and thirteen pigs (69.0 ㎏ of initial weight) were assigned to 9 treatments, each containing three replicates of sixteen to twenty-one pigs each. Additional nine pigs were used in a digestion trial. Treatments were two controls (12% CP and 14% CP), foreign CrP-CaCO₃, two CrP-Zeolite (12% CP and 14% CP), domestic CrP-CaCO₃ 1, CrP-CaCO₃-ZnO (12% CP and 14% CP) and domestic CrP-CaCO₃ 2. ADG was not significantly different among the treatments. Tenth rib backfat thickness tended to be decreased by feeding diet with CrP. Carcass grade was improved by using zeolite and CaCO₃ + ZnO along with CrP in diets. Serum cholesterol level was significantly reduced by feeding diets containing CrP with CaCO₃ + ZnO or Zeolite compared with the control. Supplementation of Cr with CrP-CaCO₃ + ZnO or CrP-CaCO₃ in diets significantly improved the digestibility of crude protein and dry matter (p<0.05). The excretion of nitrogen was lower in pigs fed diets containing Cr regardless of the combinations with minerals. The excretion of phosphorus was lowest in the CrP-CaCO₃ + ZnO group which showed the highest phosphorus digestibility.

극한조건하 강구조 부재 이음부의 파괴거동해석

김두환,한석규,안세희 한국산업안전학회 1998 한국안전학회지 Vol.13 No.4

Welding structures will be occurred sudden crack or failure by reduced fracture toughness in case of low temperature. To protect these unstable fracture is very important. Because fracture of welding part come from welding faults or residual stress, critical stress intensity factors are acquired at temperatures between 22℃ and -70℃ from base metal, welding metal and H.A.Z. It was studied effectiveness of annealing and affection of residual stress under low temperatures. In case of fracture toughness test, it showed that fracture toughness value decreased, according to the decrease of temperature. Expecially In case that compressive residual stress was existed, K_c increased.

High-rate 마그네트론 스퍼터링을 이용한 오스테나이트 스테인리스강 박막 합성

이종훈,김광석,이상율,한상묵,한전건 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.2

High-rate unbalanced magnetron sputtering process was employed to deposit a STS304 stainless steel film on S45C steel. The deposition of stainless steel film was carried out at a pressure of 2×10^(-3) torr, various target power densities, substrate bias voltages and distances of target-to-substrate. Deposition rate of the STS304 stainless steel films up to 1.3㎛/min could be obtained, but it decreased more rapidly by increasing target-to-substrate distance than by decreasing ion current. The results from XRD and EDS analysis showed that unbalanced magnetron sputtering of stainless steel target could successfully transfer the multi-element composition of the bulk material to the coating without any dramatic stoichiometric variation. SEM observation of STS304 film indicated that the structure of the film was a columnar structure(zone T structure) with a fine grain size. The Knoop hardness of coated STS304 film was measured to be approximately H_k800∼850 and this high value could be attributed to the fine grain size of the film and the residual compress stress on the film. The corrosion property of the film was evaluated using salt spray test and the results indicated that the corrosion property of stainless steel coated S45C steel was similar to that of the electroplated Cr coated S45C steel.

HLA 항원이 동일한 자매에서 병발한 IgA 신병증

엄재호,한진석,이정상,김용일,김성권,이현순,김근호 대한신장학회 1989 Kidney Research and Clinical Practice Vol.8 No.3

This report described HLA identical sisters with IgA nephropathy, and it is the first case with HLA identical IgA nephropathy in Korea. The elder sister had frequent episodes of gross hematuria associated with upper respiratory tract infection, and younger sister had one episode of gross hematuria only. The renal biopsies revealed diffuse mesangial deposition of IgA, accompanied by lesser amount of C3 in immunofluorescent microscopy. Light and electron microscopic findings were compatible with IgA nephropathy. The HLA antigens were identical, which were All Aw24, B27 Bw35, Cwl Cw4, These findings are interesting in view of the association of IgA nephropathy with HLA-Bw35 antigen. Asike piror reports of HLA identical brothers with IgA nephropathy.

14 일령 이유자돈을 위한 적정 LACTOSE : SUCROSE 비율 SUCROSE RATIO FOR THE PIGS WEANED AT 14 DAYS OF AGE

한인규,김진동,조원탁,한영근,이찬호,이기웅,박향숙 한국영양사료학회 1999 韓國營養飼料學會誌 Vol.23 No.6

본 실험은 lactose에 대한 sucrose 대체가 14일령 조기 이유자돈의 성장에 미치는 영향을 알아보기 위하여 수행하였다. lactose와 sucrose의 적정비율을 결정하기 위해 평균체중 5.02±0.18 ㎏인 14일령 이유자돈 80두를 4처리 4반복, 반복당 5두씩 완전임의로 배치 하였으며, 처리구별 lactose와 sucrose의 비율은 각각 100:0(처리구 A), 75:25 (처리구 B), 50:50 (처리구 C), 25:75 (처리구 D) 및 0:100 (처리구 E)이었다. 이유초기 7일동안 뿐 아니라 시험 전 기간에 걸친 자돈의 일당중체량 및 일당사료섭취량은 처리 평균간 통계적인 유의차를 나타내지 않았으며, 다만 시험 전기간에 걸친 사료요구율에 있어서만 유의차가 인정되었으며, B와 D 처리구가 특히 우수한 것으로 나타났다 (p<0.05). 이유 1주동안 (Phase I)의 영양소 소화율은 DM과 CP를 제외하고는 처리 평균간 유의차가 인정되지 않았으며, A 처리구의 CP소화율은 다른 처리구에 비해 유의적으로 높았다 (P<0.05).그러나 B, C, D 그리고 E 처리구간에는 유의적인 차이가 보이지 않았다. 이유 14∼21일령 (Phase II)의 영양소 소화율은 처리평균간 유의차가 인정되지 않았으며, 이유 3주간에 걸친 건물, 질소 및 인의 배출량 역시 처리 평균간 유의차를 나타내지 않았다. 본 실험결과에서 나타난 바와 같이 14일령 이유자돈에 대한 탄수화물 공급원으로서의 lactose에 대한 sucrose의 대체는 자돈의 생산성 감소 및 영양소의 배출량 증가와 같은 불리함이 없이 이루어질 수 있음을 의미한다. This experiment was conducted to determine the optimum ratio of lactose to sucrose for nursery pigs weaned at 14 days of age. A total of 80 weaned pigs (BW 5.02±0.18 ㎏) were allotted into one of five treatments using a completely randomized block design. Treatments were 100:0 (A), 75:25 (B), 50:50 (C), 25:75 (D) and 0 :100 (E) in lactose : sucrose ratio. For the first week after weaning, no significant differences were found in average daily gain (ADG), average daily feed intake (ADFI) and feed conversion ratio (FCR, feed/gain). There were also no significant differences in ADG, ADFI and FCR among treatments during the second and third week after weaning. During overall experimental period, FCR was significantly influenced by dietary treatment, especially B and D treatments showed better FCR than other treatments (p<0.05). During the initial 7 day postweaning (Phase I), the nutrient digestibility was not influenced by the lactose: sucrose ratio except for dry matter (DM) and crude protein (CP). CP digestibility of diet A was significantly higher than those of other diets (p<0.05), but no significant.differences were found among diets B, C, D and E. During the second and third week postweaning (phase II), no significant differences were found in digestibilities of GE, DM, CA and P among treatments. There were no significant differences in nutrients excretion among treatments. These results indicate that sucrose can be well utilized by baby pigs as the source of carbohydrate after 15 days of age. It implies that lactose added in weaner diets could be partially replaced with sucrose.

배양된 혈관내피세포에서 uncoupling protein 2 유전자 과발현이 세포내 산화스트레스 및 endothelin - 1 mRNA 발현에 미치는 영향

강효경,한정희,홍성관,김하영,남궁일성,박기영,박혜선,이재담,박중열,이인규,이기업 한국지질학회 2001 韓國脂質學會誌 Vol.11 No.2

크롬 피콜린산 또는 카르니틴이 첨가된 사료급여가 비육돈의 성장 및 도체특성에 미치는 영향

김지훈,한인규,김대성,배극환,양종석,손현수,현영 한국영양사료학회 1999 韓國營養飼料學會誌 Vol.23 No.5

본 시험은 여러 가지 광물질과 혼합된 크롬 피콜린산이나 카르니틴을 첨가한 사료의 급여가 비육돈의 성장 및 도체특성에 미치는 영향을 조사하기 위하여 실시되었다. 평균체중 60.69±1.11 kg인 삼원교잡종 (Yorkshire×Landrace×Duroc) 비육돈 암수 180마리를 대조구, CFC{CrP + Fe₂O₃ + CaCO₃}, CFZC{CrP + Fe₂O₃ + ZnO + CaCO₃}, CZC-1 {CrP (1/300) + ZnO(9/300) + CaCO₃(290/300)}, CZC-2(CrP(1/300) + ZnO(14/300) + CaCO₃ (285/300)} 그리고 카르니틴구 등 6처리구에 성별로 배치하였다. 크롬 피콜린산이나 카르니틴에 의한 성장개선은 발견되지 않았다. 수퇘지에 있어서는 CFZC 처리구가 CZC-2 처리구보다 유의적으로 사료효율이 좋았다 (p<0.05). 도체특성에 있어서도 전체적으로 처리구간의 유의적인 차이는 발견되지 않았으나, 수퇘지에서는 CFZC 처리구가 대조구에 비해 등지방두께가 않았고 (p<0.05), 가장 좋은 도체등급은 CZC-2 처리구에서 나타났다. A study was conducted to investigate the effect of feeding diets containing chromium picolinate (CrP) or carnitine on growth and carcass characteristics in finishing pigs. A total of 180 cross bred pigs (Yorkshire x Landrace x Duroc; initial body weight of 60.7±1.1 kg) were assigned to 6 treatments : Control, CFC{CrP + Fe₂O₃ + CaCO₃}, CFZC{CrP + Fe₂O₃ + ZnO + CaCO₃}, CZC-1 {CrP (1/300) + ZnO(9/300) + CaCO₃(290/300)}, CZC-2(CrP(1/300) + ZnO(14/300) + CaCO₃ (285/300)} and camitine. No significant improvement was found in average daily gain (ADG), average daily feed intake (ADFI), and feed/gain ratio (F/G) by feeding diets containing chromium picolinate. The feed efficiency of male pigs fed with CFZC was better than pigs fed CZC-2 diet during the entire period (p<0.05). No differences were found in carcass characteristics between treatments expect that backfat thickness was reduced in male pigs fed the CFZC diet compared to the control (p<0.05). The best carcass grade was found in pigs fed CZC-2 the diet.

MANNOPROTEIN 과 GLUCAN 의 첨가가 쥐의 성장과 NATURAL KILLER CELL ACTIVITY 에 미치는 영향

손광수,조광근,최윤재,윤연화,김재영,한영근,문태현,김성찬 한국영양사료학회 1999 韓國營養飼料學會誌 Vol.23 No.6

본 연구의 목적은 효모 세포벽, 또는 효모의 세포벽으로부터 본 연구에서 확립한 방법으로 분리한 mannoprotein(MP)과 glucan(Glu)을 동물에 급여하므로써 동물의 일당중체량, 일당사료섭취량과 사료:중체량의 비율, 그리고 동물이 가지고 있는 면역기능의 활성화정도를 조사하는데 있다. 산업적 측면에서 대량 추출하기 위하여 기존에 있는 방법을 개선하여 변형된 방법으로 효모세포벽제제를 분리하였다. 본 연구에서 분리된 효모세포벽제제(cell wall, mannoprotein glucan)와 시판중인 효모세포벽제제(Bio-Mos^(TM))를 0.1%로 4주령 횐쥐에 4주간 급여하였다. 일당중체량은 개선된 방법으로 분리한 glucan을 급여한 처리구에서 가장 높은 중체량을 나타냈으며, 다음으로 mannoprotein 급여구가 높았으며 cell wall과 시제품(Bio-Mos^(TM)) 급여구에서 낮은 중체량을 보였다. 일당사료섭취량에 있어서 glucan 급여구가 cell wall과 시제품 급여구들과 비교할 때 높았으며 사료:중체량 비율 또한 glucan 급여구에서 가장 좋은 경향을 보였다. 사양 4주깨 횐쥐로부터 spleen을 채취하여 YACl 세포에 대한 natural killer cell의 cytotoxicity를 분석한 결과 본 실험실에서 분리한 mannoprotein과 glucan이 면역 증진효과가 큰것으로 보였다. Mannoprotein 급여구와 glucan 급여구에서 대조구와 cell wall 급여구보다 면역 효과가 뚜렷하게 나타났으며(MP, P<0.01; Glu, P<0.05), mannoprotein 급여구가 glucan 급여구보다 natural killer cell의 활성도가 높았다(P<0.01). 결론적으로 효모세포벽, mannoprotein과 glucan을 횐쥐에 급여했을 때 성장능력에 있어서 유의성 있는 효과가 나타나지 않았지만 세포배양수준에서 spleen natural killer cell의 activity를 증가시키는 효과가 있다. The purpose of this study was to investigate the average daily gam, average daily feed intake, feed gain ratio and immune system activation of rats when feeding yeast cell wall, mannoprotein (MP) and glucan (Glu) which were isolated from yeast cell wall. In order to isolate the yeast cell wall products in large scale, we used the improved isolation method basing on the typical one. In this study, yeast cell wall products (cell wall, mannoprotein, glucan) and commercial product (Bio-Mos^(TM)) were fed to 4-week old rats by 0.l% during 4 weeks experimental period. Glucan(extracted from improved method) provided the highest average daily gain. Mannoprotein treated group showed the second highest average daily gain. Cell wall and Bia-Mos^(TM) fed groups showed lower average daily gain. Treatment fed glucan also showed higher average daily feed intake than that of cell wall and commercial Bio-Mos^(TM) groups. And in feed: gain ratio, glucan fed rats showed the respectively good results. At the 4th week of feeding trial, rats' spleens were obtained from all the treatments to evaluate the cytotoxicity of natural killer cell against YACl tumor cell. The results indicated that mannoprotein and glucan had the significant effects on activating immune system. Rats of mannoprotein and glucan treated groups showed the higher immune activity than that of cell wall and control groups (MP, P<0.01; Glu, P<0.05), and natural killer cell activity of mannoprotein fed rats was higher than that of glucan fed rats (P<0.01). In conclusion, although the addition of yeast cell wall, mannoprotein and glucan to the diet of rats did not provide the significant effects on growth performance, it was clear that the mannoprotein and glucan isolated in this study could stimulate the activity of spleen natural killer cell in the cell culture.

사료의 pH 및 단백질 수준이 자돈의 성장 및 영양소 소화율에 미치는 영향

김지훈,한인규,김진동,조원탁,현충남,이지훈 한국영양사료학회 1999 韓國營養飼料學會誌 Vol.23 No.4

자돈사료내 pH와 단백질 수준의 효과를 알아보기 위하여 2개의 시험을 수행하였다. 시험 1에서는 pH 수준이 자돈의 성장과 영양소 소화율에 미치는 영향을 총 150두의 자돈(L×D×LW ; 8.82㎏ BW 30 ± 2일령)을 이용하여 1) pH 4.7, 2) pH 5.2, 3) pH 5.7 (basal diet), 4) pH 6.2, 5) pH 6.7의 다섯처리를 두었고, 시험 2에서는 pH와 단백질 수준의 효과를 알아보기 위하여 150두의 자돈을 (L×D×LW ; 5.46㎏ BW) 2×3 요인법으로 배치하였다. (조단백질 = 21.5, 24.5%, 사료 pH = 4.5, 5.5, 6.5). 또한 소화율의 측정을 위하여 시험 1에는 25두, 시험 2에는 24두의 자돈에 T-cannular를 설치하였다. 시험 1에서 pH는 자돈의 성장에 아무런 영향이 없는 것으로 나타났다. 낮은 pH사료를 급이한 구에서 사료효율이 약간 좋은 경향이 있었으나, 유의적인 차이는 발견되지 않았다. 회장 및 분소화율도 처리에 의한 효과가 발견되지 않았다. 시험 2에서는 낮은 pH 사료를 급이한 구에서 성장 및 사료효율이 개선되는 경향이 있었다 (P = 0.16). 사료효율은 단백질 수준에 의한 영향이 있었으며 (P<0.05), pH와 단백질 수준간의 상호작용이나 다른 효과는 발견되지 않았다. 회장 소화율도 단백질 수준에 의한 영향은 있었으나, pH의 효과는 methionine의 소화율에만 영향이 있는 것으로 나타났다. 전체적으로 소화율은 pH에 의한 일정한 경향이 발견되지 않았다. 본 시험의 결과는 사료의 pH 조절효과는 자돈의 나이나 사료의 종류에 따라 영향을 받는다는 것을 암시하며, 일반적으로 통용되고 있는 자돈사료는 특별한 산성화 처리가 필요하지 않은 것으로 나타났다. Two experiments were conducted to investigate the effect of diet pH and protein levels on the growth performance and nutrients digestibility in young piglets. In Exp. 1, a total of 150 piglets (Landrace × Duroc × Large White ; 8.82㎏ B W, 30 ± 2 days of age) were allotted into 5 treatments. Treatments were 1) pH 4.7, 2) pH 5.2, 3) pH 5.7 (basal diet), 4) pH 6.2 and 5) pH 6.7. In Exp. 2, the effect of dietary protein and diet pH levels on the growth performance and nutrient digestibility was examined with 150 crossbreds Landrace × Duroc × Large White ; 5.46㎏ BW) piglets in 2 × 3 factorial arrangement. (21.5 and 24.5% CP and diet pH (4.5, 5.5 and 6.5)). Each treatment has 5 replications, 5 heads per replicate. For the digestibility determination, 25 pigs for Exp 1. and 24 pigs for Exp. 2. were fitted with simple T-cannula and individually fed the experimental diet. In Exp. 1, no significant difference was found in any of the criteria measured. Pigs fed low pH diets showed slightly better feed efficiency, but the difference was not significant. Both ileal and fecal nutrient digestibility were not different. A small difference was found in major amino acids digestibility, but there was no constant trend detected. In Exp. 2, pigs fed low pH diet showed a trend (P = 0.16) to grow faster than those fed high pH diet. Feed efficiency was affected by protein level (P<0.05). No other main effect was detected. Protein level affected the ileal digestibility of energy, dry matter, crude fat, methionine and threonine. The effect of pH was found only in methionine digestibility. No other main effect was found in ileal digestibility. It appeared that age of pigs and type of diet could greatly influence the effect of diet pH manipulation. Acidification of commercially available diets might have minimal effect when diet contained high portion of high quality feed ingredients.

시료내 라이신 : 에너지 비율이 이유 자돈의 성장 및 영양소 소화율에 미치는 영향 DE RATIO ON THE GROWTH PERFORMANCE AND NUTRIENT DIGESTIBILITY IN WEANED PIGS

한인규,김진동,현충남,이지훈,강완병,현영 한국영양사료학회 1999 韓國營養飼料學會誌 Vol.23 No.5

본 연구는 현대의 빠르게 성장하는 이유자돈에서 사료내 Lys : DE 비율이 이유자돈의 성장 및 영양소 소화율에 미치는 영향을 알아보기 위하여 실시되었다. 평균체중 5.70±0.14의 이유자돈 (Yorkshire×Landrace×Duroc) 100두를 공시하였고, 제 1기 (0∼14일) 동안, 두 수준의 에너지 (3,400과 3,600 ㎉ DE/㎏)와 두 수준의 Lys : DE 비율 (4.4와 4.9 g/Mcal), 제 2기 (15∼28일) 동안, 두 수준의 에너지 (3,300과 3,500 ㎉ DE/㎏)와 두 수준의 Lys : DE 비율 (4.4와 4.9 g/Mcal)이 되도록, 2×2 요인법으로 설계하였으며 4처리 5반복 반복당 5두의 이유자돈이 공시되었다. 시험 전기간 (0∼28일)동안, 일당중체량 (ADG)은 저 에너지-고 Lys : DE구가 저 에너지-저 Lys : DE구 보다 높았으며, 사료요구율 (FCR)은 고 에너지-고 Lys : DE구가 저 에너지-고 Lys : DE구를 제외한 나머지 처리구들 보다 낮은 경향을 보여 주었으나 유의한 수준은 아니였다. 사료내 Lys : DE 비율이 높아짐에 따라 ADG가 높아지는 경향을 보여 주었으나 유의하지는 않았다 (P>0.05). 그러나 FCR은 Lys : DE 비율이 높아짐에 따라 유의하게 개선되었으며 (P<0.05). 에너지 수준에 따른 차이는 관찰되지 않았다. 제 1기 동안 영양소 소화율은 사료내 에너지수준에 따라 영향받지 않았다. 건물소화율과 총에너지 소화율은 Lys : DE 비율이 증가함에 따라 유의하게 개선되었다 (P<005). 제 2기 동안 조지방을 제외한 영양소 소화율은 사료내 에너지 수준간에 따라 영향받지 않았다. 사료내 Lys : DE 비율에 따른 영양소 소화율에 있어 유의한 차이는 관찰되지 않았다. 제 1기 동안 필수 및 비필수 아미노산 소화율에 있어서는, 처리에 따른 유의한 차이가 관찰되지 않았다. 그러나 제 2기 동안 총필수 아미노산과 총 아미노산 소화율이 사료내 Lys : DE 비율이 증가함에 따라 유의하게 개선되었다 (P<0.05). 본 실험결과는 이유자돈이 4.4 g Iysine/Mcal DE 수준보다 4.9 g Iysine/Mcal DE 수준의 사료를 효과적으로 이용할 수 있음을 제시해 주었다. This study was carried out to evaluate the effect of lysine:energy ratio (Lys : DE) on growth performance and nutrient digestibility of weaned pigs. A total of 100 pigs (Yorkshire × Landrace × Duroc) averaging 5.7±0.14 ㎏ of initial body weight were employed. Two levels of dietary energy (3,400 and 3,600 ㎉ DE/㎏) with two levels of Lys : DE ratio (4.4 and 4.9 g/Mcal) for phase I period (0 to 14 d) and two levels of energy (3,300 and 3,500 ㎉ DE/㎏) with two levels of Lys : DE ratio (4.4 and 4.9 g/Mca1) for phase II period (15 to 28 d) were involved in a two × two factorial arrangement, respectively. Each treatment had five replicates with five pigs per replicate. During phase I period (0 to 14 d), no difference between groups in ADFI, and feed conversion rate (FCR) was significant. However, FCR was significantly improved with increased Lys : DE ratio (P<0.05). During phase II period (15 to 28 d), ADG, ADFI and FCR were not significantly (P<0.05) different among groups. There was no interaction between dietary energy concentration and Lys : DE ratio in growth performances of weaned pigs. FCR, however, was improved with increased energy level and Lys : DE ratio (P<0.05). During the overall period (0 to 28 d), there was no interaction between dietary energy concentration and Lys : DE ratio in growth performances of weaned pigs. However, there was a tendency for higher ADG with higher Lys : DE ratio. FCR was significantly improved with increased Lys : DE ratio (P<0.05), but was not affected by dietary energy concentration. During phase I period (0 to 14 d), no differences in nutrients digestibilities were observed between dietary energy levels. Between dietary Lys : DE ratios, dry matter (DM) and gross energy (GE) digestibilities were significantly (P<0.05) improved with higher Lys : DE ratio. During phase II period (15 to 28 d), no differences in nutrients digestibilities except energy levels. Between dietary Lys : DE ratios, no significant differences in nutrients digestibilities was observed. In regard to amino acids digestibilities, during phase I period (0 to 14 d), average values of essential amino acids (EAA), non-essential amino acids (NEAA) and total amino acids digestibilities were not significantly influenced by dietary energy levels and Lys : DE ratios. During phase II period ( 15 to 28 d), pigs fed high Lys : DE ratio diets showed significantly (P<0.05) higher total EAA and total amino acids digestibilities. The digestibilities of threonine, methionine, phenylalnine and serine were significantly improved as the dietary Lys : DE ratio increased. In conclusion, the results of the current experiment indicate that fast-growing weaned pigs might be able to use more effectively diets contatining 4.9 g lysine/Mcal DE compared to diets containing 4.4 g lysine/Mcal DE.