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      • KCI우수등재

        병아리에서 단백질의 생물학적이용성에 미치는 비단백태질소의 영향

        고태송,김영범,서인준,남기택 ( Tae Song Koh,Young Bum Kim,In June Suh,Ki Teag Nam ) 한국축산학회 1985 한국축산학회지 Vol.27 No.12

        In order to investigate an effect of non-protein nitrogen (NPN) on the biological utilization of protein, hatched single comb White Leghorn male chicks were fed for the first 8 days on a commercial chick mash, followed by 6 days on protein-free diet and the subsequent 6 days on the protein-free diets and protein diets containing 10.59% of crude protein supplemented with 0, 0.5, I.0 and I.5% of urea, respectively. When chicks fed protein-free diets, feed intake was lowered gradually as urea contents of diets were increased, while body weight loss was not altered. Protein efficiency ratio (PER) and net protein ratio (NPR) were increased in the order of the increasing level of urea in diet. Nitrogen balance were in negative balance while the values were increased with the increasing urea vontents in diets. Digestibility of nitrogen were lowered along with the increasing contents of urea, but biological value (BV) and net protein utilization (NPU) was found a trend to be high in birds fed 1.5% of urea. When birds fed protein diets, body weight gain and feed intake were not different among birds fed the graded levels of urea although feed conversions were trended to be high along with the increasing urea contents. The PER and NPR were lowered in the order of the increasing level of urea. Nitrogen balance and urinary nitrogen excretion was highered as urea levels of diets increased while fecal nitrogen excretion were not altered. BV and NPU of protein were found a tendency to be high in birds fed protein diets added with 0.5% of urea.

      • KCI우수등재

        감귤가공부산물의 아세톤추출 및 초음파 처리가 가금의 에너지이용성에 미치는 영향

        고태송,서인준,남기택,김영범 ( T . S . Koh,I . J . Suh,K . T . Nam,Y . B . Kim ) 한국축산학회 1985 한국축산학회지 Vol.27 No.10

        In order to investigate an utilizability of citrus pulp, a byproduct of manufacturing juice or can from orange, as a possible feed resource, metabolizable energy (MEn) and productive energy (PE) of untreated citrus pulp were compared with those of wheat bran and citrus pulp extracted with acetone (citrus pulp-AE) or ultrasonically treated citrus pulp (citrus pulp-UT). Hatched single comb White Leghorn male chicken were raised for 8 days with a commercial diet and for next 3 days with basal (wheat bran) diet and for subsequent 10 days with experimental diets containing 17.0% of cellulose (cotton meal), wheat bran, untreated citrus pulp, citrus pulp-AE arid citrus pulp-UT, respectively. The MEn was measured by intake energy minus excreted energy in excreta and the PE was calculated by protein and lipid retention determined by carcass analysis of birds. Body weight gain or protein and lipid retention were not significantly different among buds fed experimental diets. But the body weight gain or protein and lipid retention of birds fed citrus pulp-AE and -UT were highering compared with that fed untreated citrus pulp, And feed conversions of birds fed citrus pulp-AE and -UT showed lowering tendency compared to that fed untreated citrus pulp. The rate of MEn to gross energy (GE), MEn/GE, was not significantly different between birds fed wheat bran diet and those fed citrus pulp-AE and -UT diets, which were higher than that fed untreated citrus pulp. But PE and PE/MEn were not significantly different among birds fed experimental diets.. MEn of citrus pulp-AE had shown 1.885 ㎉ per gram dry matter was similar with that of wheat bran, which was significantly higher than those of untreated citrus pulp and citrus pulp-UT. The MEn/GE of citrus pulp-AE had been 44.8% and was also similar with 43.2% oi` wheat bran, which was significantly higher than 21.8 and 29.1% of untreated citrus pulp and citrus pulp-UT, respectively. The PE of untreated citrus pulp, citrus pulp-AE and citrus pulp-UT reached to 0.906, 1.831 and 1.500 ㎉ per gram dry matter, respectively. The results seem to indicate that the energy utilization of citrus pulp extracted with acetone be similar with that of wheat bran and that the availability of citrus pulp would be improved by some proper treatment.

      • KCI우수등재

        병아리에서의 감귤가공부산물의 이용과 콜레스테롤대사에 미치는 영향

        서인준,남기택,고태송 ( I . J . Suh,K . T . Nam,T . S . Koh ) 한국축산학회 1985 한국축산학회지 Vol.27 No.10

        Utilizability of citrus pulp and it`s effect on cholesterol metabolism was studied in chicks. The neutral detergent fiber (NDF) and acid detergent fiber (ADF) contents were analysed in the experimental, materials and residues (cellulosics) of excreta from birds fed diets contained wheat bran, citrus pulp, acetone extracted (AE) citrus pulp and ultrasonically treated (UT) citrus pulp. Cholesterol deposition in carcass and steroids excretion in excreta of birds fed diets contained cellulose (cotton meal), wheat bran, citrus pulp, citrus pulp-AE and citrus pulp-UT were investigated. The contents of NDP and ADP of experimental materials generally were lower than those of the residues from excreta of buds fed diets containing experimental materials. It seemed to be originated from the decrease of cell contents of the materials in the residues by digestion in the digestive tract of the chicks. The digestibility of cell contents in wheat bran, citrus pulp and citrus pulp-UT reached to 60.9, 59.7 and 49.9io, respectively, which was low comparing to 75.5% in citrus pulp-AE. Carcass of buds contained 456-460㎎ of cholesterol in the initial stage of experimental feeding, while chicks fed cellulose, wheat bran, citrus pulp, citrus pulp-AE and citrus pulp-UT had diposited 45.5, 48.7, 46.4, 67.9 and 61.7㎎, respectively, per day during 10 days of experimental feeding. Thus birds fed citrus pulp-AE accumulated significantly more cholesterol compared with those of citrus pulp. When birds were fed with cellulose, citurs pulp-AE and citrus pulp-UT, cholesterol accumulation per metabolic body size (㎏^(0.75)) correlated negatively with steroids excretion per ㎏^(0.75) in excreta while those values in birds fed wheat bran and citrus pulp were shown different trend. Cholesterol deposition per ㎏^(0.75) of birds fed cellulose, citrus pulp-AE and citrus pulp-UT correlated positively with the retention of protein and lipids per ㎏^(0.75). Birds fed wheat bran and citrus pulp contained relatively constant values though the levels of protein and lipids were changed. It was supposed that the effect of acetone extracted and ultrasonically treated citrus pulp on the metabolism of cholesterol in chicks will be different with those of wheat bran and citrus pulp.

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