• Asian-Australasian Journal of Animal Sciences
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• 제16권2호
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• pp.172-175
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• 2003

The regression equations of dry weight of planktonic biomass upon physico-chemical characteristics of fifteen ponds in three replicates under the influence of artificial feed, broiler manure, buffalo manure, N:P:K (25:25:0) and a control pond was obtained after one year of experimental period by using stepwise regression method. Water samples from each of the ponds were analyzed daily. However, the average values were calculated on the basis of 15 day intervals designated as fortnight. In artificial feed supplemented pond the regression of average nitrates on dry weight of planktonic biomass accounted for 71.7% of the variation in biomass. In broiler manure fertilization pond the regression of total nitrogen on dry weight of planktonic biomass held it responsible for more than 74.6% of variation in biomass. In buffalo's manure fertilized pond more than 82% of the variations in biomass were due to total nitrogen. In case of N:P:K (25:25:0) treated pond 66% of the variation in the dry weight of planktonic biomass was due to average nitrates. The control pond showed the dependence of biomass on light penetration. This equation explained more than 62 percent of variation in biomass. Other variables also showed some contribution towards variation in biomass under all the treatments in these regression studies.

• Animal Bioscience
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• 제37권6호
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• pp.1110-1120
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• 2024

Objective: This study was conducted to evaluate the effect of offering (OSF) or not (NSF) supplemental feed at milking on temperament (TS), udder hygiene (UHS) and body condition (BCS) scores, and milk yield per milking (MYM), milk quality traits, and profitability of primiparous Anatolian buffalo cows at 90 days of lactation confined in closed-tied (CB) or semi-open free-stall (OB) barns. Methods: In Experiment I, 108 cows were selected to encompass four treatments (OBOSF, OB-NSF, CB-OSF, and CB-NSF) of 27 cows, considering barn type (OB and CB) and supplementary feed (OSF and NSF) at milking. In Experiment II, 60 OB cows were selected to encompass one of five groups of 12 cows each: i) no supplemental feed (CON), ii) commercial concentrate (CC), iii) CC + corn silage (CCS), iv) CCS + alfalfa hay (CSA), or v) CC + ryegrass silage (CRS) at milking. Results: The TS and UHS of the OB and OSF cows were lower (better) than those of the CB and NSF cows, respectively. The OSF increased milk protein, lactose, and solids-not-fat but decreased milk freezing point and electrical conductivity compared with the NSF. The MYM and milk fat of the OB-OSF cows were higher than those of the OB-NSF and CBNSF cows. The TS and UHS of the cows negatively correlated with MYM and some milk chemicals (fat, protein, and solids-not-fat), but BCS correlated positively. The TS and milk electrical conductivity of the CCS, CSA, and CRS cows were lower than those of the CON and CC cows, but BCS, MYM, and milk fat were higher. Partial budget analysis identified a higher net profit for supplemental feed-offered groups (OB-OSF, CCS, CSA, and CRS). Conclusion: Offering roughage with concentrates at milking for indoor primiparous buffalo cows is more conducive to well-being, milk yield, milk quality, and economy.

• Asian-Australasian Journal of Animal Sciences
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• 제3권1호
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• pp.47-52
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• 1990

During prolonged exposure to the sun for 8 h each day for 10 days in which the highest ambient temperature around 14:00 h was $39^{\circ}C$, buffaloes exposed to the sun without shade increased the turnover of body water by 35% and 76% on day 5 and day 10 of exposure respectively. The total body water markedly decreased on day five and this amount was maintained thereafter. Plasma and blood volumes did not change significantly on day five but markedly decreased on day 10. Packed cell volume significantly decreased on day five and day 10 of the exposure period. The reduction of packed cell volume on day 10 coincided with the decrease in total plasma water. On day 10 of the exposure, an increase in the rate of liquid flow from the rumen was noted. It is concluded that on the fifth day of exposure, the increase in the evaporative cooling process was attributed to initial mobilization of water from the intracellular compartment. The reduction of both plasma and cell volumes occurring from day five to day 10 indicated a loss of body water from both intracellular and extracellular compartments.

• 한국물환경학회지
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• 제21권4호
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• pp.410-415
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• 2005

The main purpose of this study is to evaluate the characteristics of three sets of traditional control methods (proportional, integral, and proportional - integral controls) through lab-scale biological reactor experiments. An increase in proportional gain ($K_c$) resulted in reduced dissolved oxygen (DO) offset under proportional control. An increase in integral time ($T_i$) resulted in a slower response in DO concentration with less oscillation, but took longer to get to the set point. P-I control showed more stable and efficient control of DO and airflow rates compared to either proportional control or integral control. Developed P-I control system was successfully applied to lab-scale Sequencing Batch Reactor (SBR) for treating industrial wastewater with high organic strength.

• 한국물환경학회지
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• 제22권3호
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• pp.527-533
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• 2006

Tetracycline is one of the mostly used antibiotics around the world. The purpose of this study was to evaluate the fate of two different types of tetracycline resistant bacteria in biological wastewater treatment plants. Tetracycline resistant enterics and heterotrophic bacteria were monitored under two different lab-scale experimental conditions. Tetracycline resistant enteric bacteria showed the lower percentages of total enteric bacteria and net specific growth rate in the monitored activated sludge system as compared to tetracycline resistant heterotrophic bacteria. Therefore, total enterics, potentially E.coli, might not be the best indicator microorganism for evaluating the antibiotic resistant bacteria in biological wastewater treatment plant.

• Asian-Australasian Journal of Animal Sciences
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• 제15권3호
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• pp.321-325
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• 2002

Karyotype analysis was carried out on blood samples of 30 water buffaloes belonging to different breed groups (i.e. Philippine Carabao (PC), Indian Murrah (IM), Bulgarian Murrah (BM), "$F_1$ 50% IM-50% PC", "$F_1$ 50% BM-50% PC" and "75% IM-25% PC"), using the modified Leucocyte Culture Technique. The modal chromosome numbers of the PC, "$F_1$ 50% IM-50% PC", "$F_1$ 50% BM-50% PC", IM, BM and "75% IM-25% PC" were 2n=48, 49, 49, 50, 50 and 50, respectively. The water buffalo chromosomes are mostly acrocentric (79.67%) and the remainder submetacentric (20.33%). Results of the ordinary least square analysis showed significant breed effects (p<0.01) on other karyotypic characteristics (i.e. relative length, arm ratio and centromeric index). Significant correlation between karyotypic characteristics and some animal performance traits were also found. The significant correlation values imply that karyotypic characteristics can be used as important criteria to select potentially productive young water buffaloes. In the future, more production and reproduction traits from non-institutional herds should be included in the analysis to reveal meaningful correlations with various karyotypic characteristics.

• 대한토목학회논문집
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• 제5권2호
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• pp.41-50
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• 1985

본(本) 연구(硏究)에서는 earth dam 파괴로 인한 유출수문곡선(流出水文曲線)의 해석(解析)을 실시(實施)하였다. Earth dam의 파괴에 대하여 이제까지 연구(硏究), 조사(調査) 파괴양상 및 저류방정식등(貯溜方程式等) 바탕으로 DBFW(Dam Break Flood Wave) 모형(模型)을 개발(開發)하였고 개발(開發)된 모형(模型)을 Teton과 Buffalo-Creek 댐에 적용(適用)하여 유출수문곡선(流出水文曲線)을 해석(解析)하였는데 그 결과(結果)는 유출수문곡선(流出水文曲線)의 형상(形狀)이나 첨두유량(尖頭流量) 및 첨두발생시간(尖頭發生時間) 등에 대하여 NWS의 조사결과(調査結果)와 매우 작은 편차(偏差)로 일치(一致)하고 있어 본(本) 모형(模型)의 적용성(適用性)을 입증(立證)하였다. 파괴양상이 유출수문곡선(流出水文曲線)에 미치는 영향은 저수지(貯水池)의 지형학적(地形學的) 특성(特性), 파괴부의 형태(形態), 파괴폭 및 파괴지속시간등이 큰 것으로 나타났으며, 국내 earth dam을 지형학적(地形學的) 특성(特性)에 의하여 4가지 type으로 구분(區分)하고 각각에 대한 수위(水位)-수표면적(水表面積) 관계식(關係式)을 도출(導出)한 후 임의의 댐 높이와 파괴지족시간에 대한 첨두유출량(尖頭流出量) 및 유출수문곡선(流出水文曲線) 구할 수 있는 도표(圖表)를 제시(提示)하였다.

• Asian-Australasian Journal of Animal Sciences
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• 제16권3호
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• pp.374-379
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• 2003

Four rumen fistulated Murrah buffaloes were used to study the effect of four diets differing in roughage to concentrate ratio on rumen biochemical changes, microbial enzyme profile and in sacco degradability of feed in a $4{\times}4$ Latin Square design. The animals were fed four diets consisting of 80:20, 70:30, 60:40 and 50:50 ratios of wheat straw and concentrate mixtures, respectively. Wheat straw and concentrate mixture were mixed with water (0.6 l/kg feed) and complete feed mixture was offered to the animals at 8:00 h and 16:00 h in two equal parts. The variation in pH of rumen liquor (difference of maximum and minimum during 0-8 h post feeding) increased with increasing level of concentrate mixture in the diet. There was no effect of diet composition on volatile fatty acids, total nitrogen and trichloro-acetic acid precipitable nitrogen in the rumen liquor, but ammonia nitrogen increased with increasing level of concentrate mixture in the ration. Major portions of all fibre degrading enzymes were present in the particulate material (PM) of the rumen contents, but protease was absent in PM fraction. The activities of micro-crystalline cellulase, acetyl esterase and protease increased with increase in the level of concentrate mixture, but the activities of other enzymes (carboxymethylcellulase, filter paper degrading activity, xylanase, $\beta$-glucosidase and $\beta$-xylosidase) were not affected. The in sacco degradability and effective degradability of feeds increased with increasing level of concentrate mixture in the ration.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2010년도 학술발표회
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• pp.1846-1851
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• 2010

댐붕괴 모델링에 관한 연구가 활성화된 시기는 미국 Baldwin Hills 댐(1964)과 Lower Van Norman(San Fernando) 댐(1971) 붕괴 사고 이후이며 1970년대 발생한 Buffalo Creek 댐(서부 버지니아, 1972), Teton 댐(아이다호, 1976), Laurel Run 댐/Sandy Run 댐(펜실바니아, 1977), Kelly Barnes 댐(조지아, 1977) 붕괴 사고로 인해 미국 댐 안전 관리 프로그램의 포괄적 재검토의 필요성이 제기되었다. 국내에서도 연천댐 붕괴(1996년)와 장현저수지와 동막저수지의 붕괴(2002년)로 하류에 위치한 가옥 및 농경지 침수로 인해 재산피해가 발생한 바 있으며, 2005년 비상대처계획 수립을 의무화하는 제도가 도입되었다. 오늘날 댐 붕괴와 붕괴로 인한 유출 수문곡선을 분석하는데 이용 가능한 수많은 도구들이 존재하고 있다. 가장 잘 알려져 있으며 가장 널리 이용되는 모형은 NWS Dam-Break Flood Forecasting Model(DAMBRK; Fread, 1977)이며 국내 댐 저수지 비상대처계획 수립을 위해 많이 이용되고 있다. DAMBRK 모형의 입력자료는 붕괴지속시간, 결괴부측면경사, 최종결괴부바닥표고, 댐붕괴시작수위 등이 요구되며, 이 중 결괴형성과정에 관련된 매개변수의 선정을 위해서는 댐붕괴 사례연구 자료가 활용되고 있다. 모형으로부터 도출된 붕괴유출수문곡선에 대한 적정성 평가는 과거 경험, 공학적 판단, 첨두유량 예측식에 의해 수행되고 있으며 가장 객관적인 기준이라 판단되는 첨두유출량 예측식은 사례연구 자료의 부족으로 인해 높은 불확실성을 안고 있다. 본 연구는 최근까지 개발된 댐결괴 첨두유출량 예측식을 기반으로 국내 건설된 댐의 대다수를 차지하는 필댐에 대해 댐높이, 댐형식별로 예측식의 적정성을 평가하였다.

• Asian-Australasian Journal of Animal Sciences
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• 제19권5호
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• pp.705-712
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• 2006

Influences of urea treated corncobs (UTC) ensiled with or without different additives on ruminal characteristics, in situ digestion kinetics, nutrient digestibility and nitrogen metabolism were examined in a $5{\times}5$ Latin square design using five ruminally cannulated buffalo bulls. Five iso-caloric and iso-nitrogenous diets were formulated to contain 30% dry matter (DM) from concentrate and 70% DM from 5% UTC ensiled without any additive (U) or with 5% enzose (EN), 5% acidified molasses (AM), 5% non-acidified molasses (NM) and 5% acidified water (AW), respectively. These diets were fed to buffalo bulls at 1.5% of their body weight daily. Ruminal $NH_3$-N concentration at 3 hours (h) post feeding was significantly higher in bulls fed U, NM and AW diets, however, at 6, 9 and 12 h post feeding it was significantly higher in bulls fed EN and AM diets. Ruminal total volatile fatty acids (VFA) and acetate concentrations were significantly higher with EM and AM diets compared with other diets at 3, 6, 9 and 12 h post feeding. Ruminal pH at 6 and 9 h post feeding was higher with EN and AM diets; however; it was notably lower with these diets at 3 h post feeding. Total ruminal bacterial and cellulolytic bacterial counts were higher in bulls fed EN and AM diets than in those fed the other diets. In situ ruminal DM and NDF degradabilities and total tract digestibilities were significantly higher with UTC ensiled with enzose and acidified molasses than those ensiled without any additive or other additives. Nitrogen balance was significantly higher in bulls fed EN and AM diets than those fed U, AW and NM diets. The UTC ensiled with enzose or acidified molasses resulted in better digestibility and N utilization than those ensiled without any additive, with non-acidified molasses and acidified water in buffaloes.