• Korean Deer Journal
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• no.18
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• pp.2-10
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• 1993

본 시험은 3마리의 2년생 famale sika deer에게 동일한 에너지 수준하에 단백질 함량($7\%,\;12\%\;17\%$)이 각기 다른 사료를 급여하였을 때, 사료 영양소의 이용성 변화 및 체내 N 대사, 유지를 위한 단백질 요구량, 대사성 분질소 함량 등을 규명하기 위하여 실시하였으며, 결과를 요약하면 다음과 같다. 1. DM, OM, ADF의 소화율을 사료내 단백질 함량에 따른 차이를 보이지 않았으며(P>.1), CP의 소화율은 사료내 단백질 수준이 증가함에 따라 향상되었다(P<.05). 2. 사료내 단백질 함량이 증가함에 따라 분과 뇨로의 N 배출량 모두 증가하였으며(P<.05), 사료내 단백질 수준이 7, 12, $17\%$ 이었을 때 N retention은 각각 26.9, 31, 8, $38.9\%$였다. 3. 혈증 urea-N 함량은 사료내 단백질 함량의 증가에 따라 현저하게 증가하였다.(P<.05) 4. Famale sika deer의 유지수준의 단백질요구량(protein requirement for maintenance)은 $1.81g/kgW^{0.75}/d$다. 5. 대사성 분 질소(metabolic facal N)함량은 $0.32g/kgW^{0.75}/d$였다.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.22 no.1
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• pp.135-166
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• 1977

Some biochemical features of varietal variation in seed protein and their implications for soybean breeding for high protein were pursued employing 86 soybean varieties of Korea, Japan, and the U.S.A. origins. Also, studied comparatively was the temporal pattern of protein components accumulation during seed development characteristic to the high protein variety. Seed protein content of the 86 soybean varieties varied 34.4 to 50.6%. Non-existence of variety having high content of both protein and oil, or high protein content with average oil content as well as high negative correlation between the content of protein and oil (r=-0.73$^{**}$) indicate strongly a great difficulty to breed high protein variety while conserving oil content. The total content of essential amino acids varied 32.82 to 36.63% and the total content of sulfur-containing amino acids varied 2.09 to 2.73% as tested for 12 varieties differing protein content from 40.0 to 50.6%. The content of methionine was positively correlated with the content of glutamic acid, which was the major amino acid (18.5%) in seed protein of soybean. In particular, the varieties Bongeui and Saikai ＃20 had high protein content as well as high content of sulfur-containing amino acids. The content of lysine was negatively correlated with that of isoleucine, but positively correlated with protein content. The content of alanine, valine or leucine was correlated positively with oil content. The seed protein of soybean was built with 12 to 16 components depending on variety as revealed on disc acrylamide gel electrophoresis. The 86 varieties were classified into 11 groups of characteristic electrophoretic pattern. The protein component of Rm=0.14(b) showed the greatest varietal variation among the components in their relative contents, and negative correlation with the content of the other components, while the protein component of Rm=0.06(a) had a significant, positive correlation with protein content. There was sequential phases of rapid decrease, slow increase and stay in the protein content during seed development. Shorter period and lower rate of decrease followed by longer period and higher rate of increase in protein content during seed development was of characteristic to high protein variety together with earlier and continuous development at higher rate of the protein component a. Considering the extremely low methionine content of the protein component a, breeding for high protein content may result in lower quality of soybean protein.n.

• Journal of Aquaculture
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• v.11 no.1
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• pp.1-10
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• 1998

A feeding trial was conducted to investigate optimum dietary protein and lipid levels in diets for parrot fish (Oplegnathus fasciatus). Three groups of 25 fish averaging 7.0g were fed each of the experimental diets containing 30, 40, 50 or 60% crude protein (CP) with 8 or 16% crude lipid level ($4{\times}2$factorial desing) for 8 weeks. Weight gain and feed efficiency increased significantly (P<0.05) with dietary protein level up to 50% CP when diets contained 16% lipid level, and increased with dietary protein level up 60% CP when diets contained 8% lipid level (P<0.05). The broken-like model showed that an optimum dietary protein level was 46% when the diet contained 16% dietary lipid. Fish fed diets containing 16% lipid level showed significantly (P<0.05) higher weight gain, feed efficiency and protein efficiency ratio than did fish fed diets containing 8% lipid level when diets contained 40 or 50% dietary protein (P<0.05).

• Journal of Aquaculture
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• v.6 no.1
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• pp.47-53
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• 1993

Feeding trials were conducted for a test of the optimum dietary protein levels for the fingerling Korean catfish, Parasilurus asotus. The growth response was examined in terms of weight gain, feed coefficient. protein efficiency ratio and net protein utilization for 8 weeks at $23\~27^{\circ}C$. Within a range of 25 to 55\%$ crude protein levels in the diet, the body weight increased while the dietary protein level increased. Accumulation of protein in the body reached the maximum when the crude protein level in the diet was at $45\%$. These results indicate that the optimum dietary protein level of fingerling Korean catfish was about $45\%$ when anchovy meal was used as the protein source.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.22 no.1
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• pp.1-6
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• 1977

The varietal differences of protein content in barley grain and its variation under different cultural conditions were studied. The varietal variation of protein content was significant with the range of 8～18%. The protein content of barley grain were increased by heavier nitrogen application and decreased by shading treatment and drill seeding. There was negative correlation between protein content and grain weight in hulled barley, while positive correlation between nitrogen content of plant and leaf at heading stage and protein content of barley grain was significant in Haganemugi and Buheung.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.19
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• pp.14-20
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• 1975

In order to obtain the fundamental informations on the variation of protein and amylose content in rice grain, 4 varieties were subjected to the 5 different harvesting with 5 different plantings. Amylose content in the rice grain were increased by later planting. Protein content of thermo-sensitive rice varieties were decreased while those of photo-sensitive varieties were increased by delayed planting. Interactions among planting date, variety and harvesting date were highly significant for amylose content, but not significant for protein content.

• Journal of Aquaculture
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• v.19 no.4
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• pp.299-304
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• 2006

This study was conducted to investigate the effects of protein and lipid levels of extruded pellet on growth and body composition of juvenile flounder. Six extruded dry pellets were formulated to contain two protein levels (50 and 55%) and three lipid levels (8, 12 and 15%). Triplicate groups of fish (initial mean weight 21 g) were hand-fed to apparent satiation two times a day for 9 weeks. Survival, weight gain and daily feed intake were not significantly affected by dietary protein and lipid levels. Feed efficiency and protein efficiency ratio were significantly (P<0.001) affected by dietary lipid level, and tended to increase as dietary lipid level increased. Feed efficiency ratio of fish fed the 55% protein diet with 15% lipid was not significantly different from that of fish fed the 50% protein diet with 15% lipid, but significantly (P<0.05) higher than that of fish fed the other diets. Protein efficiency ratio of fish fed the 55% protein diet with 15% lipid was significantly (P<0.05) higher than that of fish fed the 50% protein diet with 8% lipid and 55% protein diets with $8{\sim}12%$ lipids. The contents of moisture, crude protein and lipid in the liver was significantly (P<0.01) affected by dietary lipid level. The results of this study indicate that an increase in lipid level at 50-55% protein in extruded pellet can improve feed efficiency for juvenile flounder.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.20
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• pp.142-147
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• 1975

The varietal variations of protein and amylose content of rice grown at field and green house were studied. The protein content was negatively correlated with growth duration, and the amylose content was positively correlated with heading date. The environmental variation of the amylose content by cultural season and year was greater in the low amylose varieties than in the high amylose one.

• Korean Journal of Food Science and Technology
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• v.23 no.2
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• pp.192-199
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• 1991

The rheological properties of various flour blends of HRW-WW and DNS-WW having protein contents of $9.12{\sim}9.78%$ in the presence or absence of salt and alkaline reagent (an equal mixture of$Na_2CO_3\;and\;K_2CO_3$) were studied. The farinograph absorptions of HRW-WW and DNS-WW blends was increased by 1% and 0.6%, respectively, with increasing protein content by 0.33%. Salt (0.17%) decreased the absorption by 1% regardless protein contents. Alkaline reagent (0.17%) or a combination of salt and alkaline reagent had no effect on absorption of flours, indicating that the effect of salt on decreasing absorption is masked by alkaline reagent. The protein content of the flour in the presence or absence of salt, alkaline reagent or both showed a highly positive correlation with all reference points of farinograph and extensograph, but the peak viscosity of amylograph was negatively correlated with protein content only in the presence of salt, alkaline reagent or both.

• Journal of Sericultural and Entomological Science
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• v.16 no.1
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• pp.57-65
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• 1974

This study has been carried out to investigate the effect of protein components of a diet on the increasing of larval body weight and diet efficiency, as well as the amylase activity of larval digestive juices during the 5th instar. Defending on the amounts of soybean meal as a protein source, the six different kind of artificial diets containing mulberry leaf powder fed to the larvae. The results obtained may be summarized as follows： 1. As the protein components of the diet were increased, the amount of increased larval body weight was also increased. 2. As the protein components of the diet were increased, both the cocoon weight and cocoon layer weight were also increased. 3. As the protein components of the diet were increased, both the amount of diet digested and coefficient of digestibility were also increased. 4. As the protein components of the diet were increased, the diet efficiency of larvae were also increased. 5. But the experimenters could not observe any correlation between the increase of protein components of a diet and the amylase activity of the digestive juices.