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김종혁,이한규,양태성,강환구,길동용 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.9
Objective: This experiment aimed to investigate the effect of different sources and inclusion levels of dietary fat on productive performance and egg quality in laying hens raised under hot environmental conditions. Methods: A total of 480 Hy-Line Brown laying hens at 31 wk of age were randomly allotted to 1 of 5 experimental diets. The control diet contained 2,800 kcal/kg nitrogen-corrected apparent metabolizable energy with no fat addition. Four additional diets were prepared by adding 2.0% or 4.0% of animal fat (AF) or soybean oil (SO). Energy and nutrient concentrations were consistent among all diets. Diets were fed to hens for 4 weeks. Average daily room temperature and humidity were 26.7°C±1.52°C and 77.4%±4.50%. The heat stress index was approximately 76, indicating that hens were raised under heat stress conditions. Results: Final body weight (BW) was greater (p<0.05) for hens fed diets containing 2.0% or 4.0% AF than for those fed the control diet or diets containing 2.0% or 4.0% SO. The BW gain and feed intake were greater (p<0.05) for hens fed diets containing additional AF or SO than those fed the control diet. Eggshell thickness was the greatest (p<0.05) for hens fed the control diet, but the least (p<0.05) for hens fed diets containing 4.0% SO. Egg yolk color was the greatest (p<0.05) for hens fed the control diet, but the least (p<0.05) for hens fed diets containing 4.0% SO. Conclusion: Inclusion of supplemental fat (AF and SO) in diets exhibits preventative effects on BW loss for hens raised under hot environmental conditions when energy and nutrient concentrations in diets were maintained. The effects were greater for AF than for SO. However, inclusion of supplemental fat in diets decreases eggshell thickness and egg yolk yellowness, possibly due to a reduction in Ca absorption and intake of egg yolk colorants.
Ni 피복된 Al2O3 입자분산강화에 의한 Al 기 복합재료 제조
최진일,원창환,강복석,양태성,서영식 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.5
The experimental results from the fabrication of AC4C/Ni-coated Al₂O₃ composites by oxide dispersion strengthening are summerized as follows; 1) Optimum condition obtained in Ni-Al₂O₃ composites powder preparation was molar ratio of NH₃/Ni^(++) 1.5 : 1, reduction temperature 130℃, stirring speed 600rpm, hydrogen partial pressure 350 psi and reduction time 60 mins. 2) Ni coating to Al₂O₃ surface improved wettability by decreasing surface tension of the matrix and particles. 3) The tensile strength, hardness and wear resistance increased with increasing the volume fraction and decreasing the particle size. In case of the tensile strength at 12vol.% was about 25% higher than that of matrix alloy(Al-2Cu-2Mg).