Milk urea nitrogen (MUN) and Milk protein (MP) are being used as indicators of the protein-energy balance and for actual farm feeding practices. The purpose of this study was to investigate the MUN and MP concentrations of individual cows and bulk tank milk to evaluate the dietary protein-energy balance from lactating Holstein cows. Mean MUN and MP concentrations in the milk samples obtained from 132,636 cows of 4,856 herd during Jan. 1999 to Dec. 2001 were 16.2 5.2mg/dl and 3.30 0.35%, respectively. The highest values were found during summer and lowest valued during winter in MUN. But, the average contents of MP were the highest during winter and the lowest during summer. In order to evaluate protein-energy balance for feeding, we set the level of recommended MP range of 2.90${\sim}$3.29% in early lactation considering a negative energy balance. The recommended level of MP in mid-lactation and late lactation were set as 3.10${\sim}$3.49%, and 3.30${\sim}$3.69%, respectively. Recommended MUN range of 12${\sim}$18 mg/dl was determined through the whole lactation period. Individual cows milk were analyzed by the 9 types based on this levels of MP and MUN in this study. Among the total cows investigated, 26.8%, 25.8%, and 22.2% have shown the recommended criteria of MP and MUN values, respectively. Also, of total herds surveyed, 11.6% had MUN values lower than 12.0 mg/dl and 32.9% had values higher than 18.0 mg/dl and 44.5% of total herd have not met with the recommended criteria of MP values in bulk tank milk. In case of MP, out of the total herd surveyed, 26.0% had MP values lower than 3.10% and 24.0% had values higher than 3.30% and 50.0% had MP values outside the recommended interval (3.1${\sim}$3.3%). This study has indicates that many dairy farms are under improper feeding management practice of the dietary protein-energy balance.
Changes in land-use can affect soil organic matter content and fertility. We compared total soil carbon and nitrogen concentrations, soil respiration, and nitrogen availability under three land-use types in central Korea; conversion of old rice field to natural willow-maple (Salix-Acer) forest, conversion of old field to artificial Korean pine (Pines koraiensis) forest, and indigenous oak (Quercus spp.) forest. After 20 years of fallow the area of rice field conversion to forest had higher soil carbon and nitrogen concentrations in the soil depth of 0-10cm and 10-20cm than the areas of field conversion to Korean pine forest and indigenous forest. In general, soil carbon and nitrogen concentrations decreased with soil depth. Organic matter accumulation as a balance of input and decomposition seemed to be higher in the soil of previous rice field, and carbon and nitrogen accumulation was largely confined to the topsoil. Soil respiration rates were greatest at the area of rice field conversion to forest, and appeared to be related to soil carbon and soil moisture. Soil nitrogen availability measured by the ion exchange resin bag method differed significantly among land-use types; soil inorganic nitrogen ($NH_4{^+}+NO_3{^-}$) and ammonium availability were highest in the soil under indigenous oak forest followed by conversion of old field to artificial Korean pine forest and conversion of old field to natural willow-maple forest.
Kim, Pil-Joo;Lee, Yong-Bok;Lee, Youn;Yun, Hong-Bae;Lee, Kyung-Dong
Korean Journal of Environmental Agriculture
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v.27
no.4
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pp.337-342
/
2008
The nitrogen (N) and phosphorus (P) balances in Korea during 1985-2006, which calculated according to the surface balance method of the PARCOM guidelines, continually increased with the lapse of year, and then might keep the highest levels with about $250kg\;N\;ha^{-1}$ and $50kg\;P\;ha^{-1}$ in 2006 among OECD countries. National phosphorus balance of the developed OECD countries (Belgium, Denmark, Germany, The Netherlands) in the livestock feeding industries has significantly decreased, due to limit livestock feeding density and nutrient application level by using strong legislation. However, Korean P balance was not apparent decrease, since the number of livestock feeding heads has been increasing, irrespective with the decrease of chemical fertilizer consumption. Manure P portion to the total P input amount of the above four OECD Countries in nutrient balance has continuously inclined to 60-70%. Therefore, the large portion of livestock manure might be used as nutrient source in agricultural side in these countries. In particular, manure P application levels of Belgium and The Netherlands, which have relatively high P balance and manure P portion to total P input dose, was estimated to be $31-33\;kg\;p\;ha^{-1}$ in 2004, and it was similar level with that of Korea in 2006. The manure P application levels for agricultural purpose has continuously decreased in these two OECD countries. In contrast, our manure P application rate continuously increased, and therefore we need the strong political countermeasure to control livestock feeding density at the resonable level.
Kim, Hye-Jin;Jeon, Soon-Hyeok;Kim, Soon-Tae;Lee, In-Sung;Park, Yong-Soo
Corrosion Science and Technology
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v.13
no.2
/
pp.70-80
/
2014
Duplex stainless steels with nearly equal fraction of the ferrite(${\alpha}$) phase and austenite(${\gamma}$) phase have been increasingly used for various applications such as power plants, desalination facilities due to their high resistance to corrosion, good weldability, and excellent mechanical properties. Hyper duplex stainless steel (HDSS) is defined as the future duplex stainless steel with a pitting resistance equivalent (PRE=wt.%Cr+3.3(wt.%Mo+0.5wt.%W)+30wt.%N) of above 50. However, when HDSS is welded with gas tungsten arc (GTA), incorporation of nitrogen in the Ar shielding gas are very important because the volume fraction of ${\alpha}$-phase and ${\gamma}$-phase is changed and harmful secondary phases can be formed in the welded zone. In other words, the balance of corrosion resistance between two phases and reduction of $Cr_2N$ are the key points of this study. The primary results of this study are as follows. The addition of $N_2$ to the Ar shielding gas provides phase balance under weld-cooling conditions and increases the transformation temperature of the ${\alpha}$-phase to ${\gamma}$-phase, increasing the fraction of ${\gamma}$-phase as well as decreasing the precipitation of $Cr_2N$. In the anodic polarization test, the addition of nitrogen gas in the Ar shielding gas improved values of the electrochemical parameters, compared to the Pure Ar. Also, in the erosion-corrosion test, the HDSS welded with shielding gas containing $N_2$ decreased the weight loss, compared to HDSS welded with the Ar pure gas. This result showed the resistance of erosion-corrosion was increased due to increasing the fraction of ${\gamma}$-phase and the stability of passive film according to the addition $N_2$ gas to the Ar shielding gas. As a result, the addition of nitrogen gas to the shielding gas improved the resistance of erosion-corrosion.
Effects of dietary brown seaweed product levels on performance and metabolism of protein and energy were investigated in broiler chicks that were activated the acute phase response. One day old chicks were fed diets containing either 0.0(basal), 1.0, 2.0 or 4.0 % brown seaweed products for 3 weeks. The acute phase response was activated by injecting i.p. the Salmonella typhimurium lipopolysacharide(LPS) at $2^{nd}$ week of age. The acute phase response lowered nitrogen balance(NB)/ $kg^{0.75}$ (metabolic body size) and highered dietary ME values in birds fed diets containing brown seaweed product. Increase in dietary brown seaweed products levels lowered daily gain, and NB, uric acid nitrogen(UAN) excretion and ME utilization per $kg^{0.75}$ in chicks with the acute phase response. But the dietary brown seaweed product level did not affect the performance of 3 Week old broiler chicks that experienced the acute phase response. And the brown seaweed products 1.0 and 2.0 % diets lessened the feed intake reduction caused by the acute phase response in broiler chicks. The brown seaweed 2.0% diet increased NB / g diet or $kg^{0.75}$ and decreased the excretion of UAN/g diet or $kg^{0.75}$. This result indicated that the brown seaweed was able to interact with the acute phase response and increased protein retention via decreased breakdown of protein in birds fed brown seaweed 2.0% diet.
In order to investigate the effect of different sources of energy on intake and nutrient utilization from urea molasses mineral block (UMMB), rumen fermentation pattern and blood biochemical constituents, 18 intact and 9 rumen fistulated male Murrah buffaloes aged about 3 years and average weight 310.8 kg were randomly allocated into three groups of 9 animals in each, thus each group having 6 intact and three rumen fistulated buffaloes. All animals were fed individually for 90 days. All buffaloes were offered wheat straw as basal roughage and urea molasses mineral block for free choice of licking. Three different energy sources viz., barley grain, (group I), maize grain (group II) and jowar green (group III) were offered to meet their nutrient requirement as per Kearl (1982). At the end of feeding trial, a metabolism trial of 7 days duration was carried out on intact animals to determine the digestibility of nutrients. Rumen fermentation studies were carried out on rumen fistulated animals. After the metabolism trial blood was collected from intact animals to estimate the nitrogen constituents in blood serum of animals fed on different sources of energy. Results revealed no significant difference in the intake of UMMB in three groups. Similarly, the intake of DM (kg), DCP (g) and TDN (kg) per day was similar in three groups statistically. The apparent digestibility of dry matter (DM), organic matter (OM), ether extract (EE) and nitrogen free extract (NFE) was significantly (p<0.05) more in group II than group III, whereas the digestibility of DM, OM and NFE was similar in group I and II. The digestibility of crude fiber (CF) and all the fiber fractions i.e. NDF, ADF, cellulose and hemicellulose was alike in 3 groups. Nitrogen balance (g/d) was significantly (p<0.05) more in group III as compared to group I and II, which were alike statistically, though the N intake (g/d) was similar in 3 groups but N balance (g/d) was significantly (p<0.05) less in group III as compared to other 2 groups. Significantly (p<0.05) higher concentration of total volatile fatty acids (TVFA), total nitrogen (TN) and its fractions were observed in group I and II as compared to group III. There was no effect on rumen pH, rumen volume and digesta flow rate due to different sources of energy in 3 groups. Similarly the blood serum biochemical parameters (NH3-N, urea-N and total protein) were statistically identical in 3 groups.
Pathak, A.K.;Dutta, Narayan;Pattanaik, A.K.;Chaturvedi, V.B.;Sharma, K.
Asian-Australasian Journal of Animal Sciences
/
v.30
no.12
/
pp.1702-1710
/
2017
Objective: The study examined the effect of condensed tannins (CT) containing Ficus infectoria and Psidium guajava leaf meal mixture (LMM) supplementation on nutrient metabolism, methane emission and performance of lambs. Methods: Twenty four lambs of ~6 months age (average body weight $10.1{\pm}0.60kg$) were randomly divided into 4 dietary treatments (CT-0, CT-1, CT-1.5, and CT-2 containing 0, 1.0, 1.5, and 2.0 percent CT through LMM, respectively) consisting of 6 lambs each in a completely randomized design. All the lambs were offered a basal diet of wheat straw ad libitum, oat hay (100 g/d) along with required amount of concentrate mixture to meet their nutrient requirements for a period of 6 months. After 3 months of experimental feeding, a metabolism trial of 6 days duration was conducted on all 24 lambs to determine nutrient digestibility and nitrogen balance. Urinary excretion of purine derivatives and microbial protein synthesis were determined using high performance liquid chromatography. Respiration chamber study was started at the mid of 5th month of experimental feeding trial. Whole energy balance trials were conducted on individual lamb one after the other, in an open circuit respiration calorimeter. Results: Intake of dry matter and organic matter (g/d) was significantly (p<0.05) higher in CT-1.5 than control. Digestibility of various nutrients did not differ irrespective of treatments. Nitrogen retention and microbial nitrogen synthesis (g/d) was significantly (p<0.01) higher in CT-1.5 and CT-2 groups relative to CT-0.Total body weight gain (kg) and average daily gain (g) were significantly (linear, p<0.01) higher in CT-1.5 followed by CT-1 and CT-0, respectively. Feed conversion ratio (FCR) by lambs was significantly (linear, p<0.01) better in CT-1.5 followed by CT-2 and CT-0, respectively. Total wool yield (g; g/d) was linearly (p<0.05) higher for CT-1.5 than CT-0. Methane emission was linearly decreased (p<0.05) in CT groups and reduction was highest (p<0.01) in CT-2 followed by CT-1.5 and CT-1. Methane energy (kcal/d) was linearly decreased (p<0.05) in CT groups. Conclusion: The CT supplementation at 1% to 2% of the diet through Ficus infectoria and Psidium guajava LMM significantly improved nitrogen metabolism, growth performance, wool yield, FCR and reduced methane emission by lambs.
Magazine of the Korean Society of Agricultural Engineers
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v.45
no.7
/
pp.57-69
/
2003
To evaluate nutrient dynamics with different fertilization in paddy field and develop water quality model, mass balance analysis was performed during growing season of 2001-2002 in field experimental plots irrigated with groundwater. As a result of water balance analysis, most of outflow was surface drainage as about half of total outflow and about 500mm was lost by evapotranspiration. The water budget was well balanced. The runoff from paddy field was influenced by rainfall and forced drain. Especially runoff during early cultural periods more depends on the forced drain. As a result of mass balance analysis, most of nutrient was input by fertilization and lost by plant uptake. Significant amount of nitrogen were supplied by precipitation and input from upper paddy field, comprising 12%∼28% of total inflow. Nutrient loading by surface drainage was occurred showing about 15%∼29% for T-N and 6%∼13% for T-P. The response of rice yield with different fertilization was not significant in this study. Water quality model for paddy field developed using Dirac delta function and continuous source was calibrated and validated to surface water quality monitoring data. It demonstrates good agreement between observed and simulated. The nutrient concentration of surface water at paddy field was significantly influenced by fertilization. During early cultural periods when significant amount of fertilizer was applied, surface drainage from paddy field can cause serious water quality problem. Therefore, reducing surface drainage during fertilization period can reduce nutrient loading from paddy fields. Shallow irrigation, raising the weir height in diked rice fields, and minimizing forced surface drainage are suggested to reduce surface drainage outflow.
Loyra-Tzab, Enrique;Sarmiento-Franco, Luis Armando;Sandoval-Castro, Carlos Alfredo;Santos-Ricalde, Ronald Herve
Asian-Australasian Journal of Animal Sciences
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v.26
no.7
/
pp.981-986
/
2013
The nutrient digestibility, nitrogen balance and in vivo metabolizable energy supply of Mucuna pruriens whole pods fed to growing Pelibuey lambs was investigated. Eight Pelibuey sheep housed in metabolic crates were fed increasing levels of Mucuna pruriens pods: 0 (control), 100 (Mucuna100), 200 (Mucuna200) and 300 (Mucuna300) g/kg dry matter. A quadratic (p<0.002) effect was observed for dry matter (DM), neutral detergent fibre (aNDF), nitrogen (N) and gross energy (GE) intakes with higher intakes in the Mucuna100 and Mucuna200 treatments. Increasing M. pruriens in the diets had no effect (p>0.05) on DM and GE apparent digestibility (p<0.05). A linear reduction in N digestibility and N retention was observed with increasing mucuna pod level. This effect was accompanied by a quadratic effect (p<0.05) on fecal-N and N-balance which were higher in the Mucuna100 and Mucuna200 treatments. Urine-N excretion, GE retention and dietary estimated nutrient supply (metabolizable protein and metabolizable energy) were not affected (p>0.05). DM, N and GE apparent digestibility coefficient of M. pruriens whole pods obtained through multiple regression equations were 0.692, 0.457, 0.654 respectively. In vivo DE and ME content of mucuna whole pod were estimated in 11.0 and 9.7 MJ/kg DM. It was concluded that whole pods from M. pruriens did not affect nutrient utilization when included in an mixed diet up to 200 g/kg DM. This is the first in vivo estimation of mucuna whole pod ME value for ruminants.
Journal of The Korean Society of Grassland and Forage Science
/
v.18
no.3
/
pp.243-250
/
1998
This study was conducted to evaluate mineral content of Winter Rye, Nitrogen Balance, Soil chemical characteristics and NO,-N level in infiltration water as affected by different slurry application on the basis of N contents respectively and was arranged as a randomized complete block design with seven treatments (chemical fertilizer 160kg Nha, cattle slurry 160 . 320 - 480kg Nha, swine slurry 160 - 320 - 480kg Nha) and conducted at National Livestock Research Institute, RDA, in Suweon fiom Sep. 1996. to Apr. 1997. The results obtained are summarized as follows : Nirogen, Phosphorous, Calcium and Potassium of Winter Rye slightly increased as slurry application level was increased (p$NO_3$-N content ($\mu$g/g) of Winter Rye was shown fiom 780 to 1,462 in all treatments, especially , the swine slurry plots were significantly higher than that of cattle sluny plots (p < 0.05). As slurry application increased, show a marked trend toward surplus N input in all treatment. The pH of the topsoil (0~IOcm) was shown 6om 5.1 to 5.4 except the plot of chemical fertilizer before experiment pH of 5.1, but the pH of the subsoil (10~20cm) tended not to be regular. The content of available ,TEX>$P_2O_5$ inaeased with the increased application of slurry, particularly, the topsoil (O- 1Ocm) were much higher than the subsoil (10~20cm). The $NO_3$-N content of infiltration water (depth:lm) was increased as affected by sluny application.
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