Kim, Young Sin;Kim, Jae-Hwan;Suh, Sang Won;Kim, Hyun;Byun, Mi-Jeong;Kim, Myung-Jick;Kim, Ji Sung;Lee, Ji Woong;Choi, Seong-Bok
Korean Journal of Poultry Science
/
v.39
no.4
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pp.283-290
/
2012
The objective of this study was to compare the growth performance between Korean native layer chickens and imported layer chickens at early rearing stage. Total number of chicks analyzed in this study was 276 and feeding period was conducted from July 24, 2012 for 10 weeks. Five strains including 2 Korean native strains: A=Korean Native Black (Chungcheongbuk-do) and B=Korean Native Yellowish Brown (Gyeongsangbuk-do) and 3 imported layer strains: C=White Leghorn (Gyeongsangnam-do), D=White Leghorn (Seoul), and E=Ameraucanas (Gyeongsangbuk-do) were used to analyze the following traits such as fertility, hatchability, body weight at a different growing stage, average body weight gain, and feed conversion ratio. The fertilities and hatchabilities of strains were 93.88% and 95.65% in strain A, 81.75% and 86.24% in strain B, 82.25% and 88.15% in strain C, 79.25% and 90.85% in strain D, and 71.50% and 88.11% in strain E, respectively. A viability was excellent in strains A and E to be more than 98% and was low in strain D to be 86.67% at a whole week. The strain A had greater body weight during growing stages (p<0.05) than the other strains. The shank length of strain D of $56.69{\pm}3.27mm$ was the highest value at 10 weeks of age among strains (p<0.05). The phenotypic correlation coefficients of strains A and D between an average body weight gain and a shank length were 0.63 and 0.73 during 0~2 wk, 0.70 and 0.55 during 2~4 wk, 0.55 and 0.54 during 4~6 wk, 0.50 and 0.24 during 6~8 wk, and 0.46 and 0.29 during 8~10 wk, respectively. The Korean native hens may have potential abilities to be used as an excellent seed stock for poultry industry.
Park, Hyung Soo;Lee, Sang Hoon;Choi, Ki Choon;Lim, Young Chul;Kim, Jong Gun;Seo, Sung;Jo, Kyu Chea
Journal of Animal Environmental Science
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v.18
no.3
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pp.257-266
/
2012
Near infrared reflectance spectroscopy (NIRS) has become increasingly used as a rapid, accurate method of evaluating some chemical constituents in cereal and dired animal forages. Analysis of forage quality by NIRS usually involves dry grinding samples. Costs might be reduced if samples could be analyzed without drying or grinding. The objective of this study was to investigate effect of sample preparations on prediction ability of chemical composition and fermentation parameter for Italian ryegrass silages by NIRS. A population of 147 Italian ryegrass silages representing a wide range in chemical parameters were used in this investigation. Samples were scanned at 1nm intervals over the wavelength range 680-2500 nm and the optical data recorded as log 1/Reflectance (log 1/R) and scanned in oven-dried grinding and fresh ungrinding condition. The spectral data were regressed against a range of chemical parameters using partial least squares (PLS) multivariate analysis in conjunction with four spectral math treatments to reduced the effect of extraneous noise. The optimum calibrations were selected on the basis of minimizing the standard error of cross validation (SECV) and maximizing the correlation coefficient of cross validation (${R^2}_{CV}$). The results of this study show that NIRS predicted the chemical parameters with high degree of accuracy in oven-dried grinding treatment except for moisture contents. Prediction accuracy of the moisture contents was better for fresh ungrinding treatment (SECV 1.37%, $R^2$ 0.96) than for oven-dried grinding treatments (SECV 4.31%, $R^2$ 0.68). Although the statistical indexes for accuracy of the prediction were the lower in fresh ungrinding treatment, fresh treatment may be acceptable when processing is costly or when some changes in component due to the processing are expected. Results of this experiment showed the possibility of NIRS method to predict the chemical composition and fermentation parameter of Italian ryegrass silages as routine analysis method in feeding value evaluation and for farmer advice.
A total of ninety swine ($79.0{\pm}2.2\;kg$) were employed for 58 d to determine the meat quality of pigs fed fermented agricultural by-products (FAB) mainly consisting of brewers grain shell. FAB was replaced with commercial feed at dietary levels of 20%, 40%, 60%, 80%, and 100% (T1) and 30%, 60%, 100%, 100%, and 100% (T2) at 1, 2, 3, 4 and 5-9 wk, respectively. Compared with the control (CON) feed, FAD feed had lower moisture and nitrogen-free extract content, and higher crude fat, crude fiber, and total calorie (p<0.05). The protein content, amino acid profile, and pH values of pork loin were not affected by dietary treatment. However, higher moisture, crude ash, and meat cholesterol, and lower fat, were found in CON compared with treatment (p<0.05). FAB treatment significantly improved drip loss and cooking loss value (p<0.05), and increased the CIE $L^*$ values of loin and back-fat surface, whereas it decreased the CIE $a^*$ values of loin surface (pp<0.05). The results indicate that dietary FAB affected meat cholesterol and fat content, and improved drip loss and cooking loss, but had no affect on amino acid composition.
For the effective seedling production of flat oyster, Ostrea denselamellosa, dietary value of live food, densities, water temperature and salinity on growth and survival rate of the larvae were examined. In rearing larvae by feeding them phytoplankton diets, the optimal survival rate and growth rate of larvae were found using a mixed phytoplankton diet which was mixed with Isochrysis galbana, Chaetoceros calcitrans and Chlorella sp. The highest growth and survival rates of the larvae were 208.4% and 38.8% with the phytoplankton diet. In growth and survival rates of larvae with various rearing densities, the highest survival and growth rates were 228.1% and 29.0% at the density of 2 individuals/ml. In observing rearing experiments of the flat oyster larvae under various temperature conditions, average growth rates of the larvae in respect to shell length were 202.2%, 240.4%, 250.6% and 121.3% in natural water temperatures (18-22$^{\circ}C$), 24$^{\circ}C$, 28$^{\circ}C$ and 32 $^{\circ}C$, respectively. And average survival rates of the larvae were 16.0%, 32.0%, 13.0% and 0% in natural water temperatures (18-22$^{\circ}C$), 24$^{\circ}C$, 28$^{\circ}C$ and 32$^{\circ}C$, respectively. In rearing at various salinities, the highest growth rates of the larvae in shell length was 240.0% at 30.0 psu and the highest survival rate was 31.0% at 25 psu.
The present study was conducted to find the effects of different cadmium(Cd) levels in diets on clinical toxicity, sperm capacity and histopathological changes in rats. Thirty male rats of Sprague-Dawley weighing 125.3$\pm$15.2g were randomly blocked into five groups according to body weights. Five levels of Cd in AIN-76 purified diet(0, 25, 50, 100 and 250 ppm) had been fed for 8 weeks. Cadmium was supplemented with a form of CdCl$_2$. 1. After 8 weeks of Cd intake had resulted in apparent cadmium intoxication; reduced growth rate, enlarged kidney and testis, decreased hematocrit value and hemoglobin content in response to supplemented Cd levels in the diets. 2. Cadmium accumulation in liver and kidney showed a tendency to increase in cadmium-exposed groups. The levels of metallothionein were also significantly elevated in the tissues of liver in response to the levels of Cd supplemented(P<0.05). 3. Although sperm motility was not significantly different among treatments, rats fed Cd tended to have reduced sperm motility but sperm concentration of Cd supplemented groups were significantly lower than that of control(p<0.05). 4. Based on the findings from gross lesion, rats fed 250ppm of Cd were externally emaciated, had exposed penis and observed atrophies of kidney and testis. Histopathological observation seemed that the liver of groups feeding Cd supplemented diets showed cellular degeneration and accumulation of eosinophilic materials in the capillaries. In kidney, rats fed Cd diets had shown tubular epithelium degeneration and lesions of basophilic materials, while testes were weakened in numbers of spermatid and sporadically enlarged of giant cells.
Journal of The Korean Society of Grassland and Forage Science
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v.32
no.2
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pp.117-124
/
2012
This study was conducted to estimate Hanwoo carrying capacity when whole crop barley or rye as winter forage crops was grown on different applying sources (chemical fertilizer, cattle or organic fertilizer) and mixed sowing combination with hairy vetch or forage pea during the period of 2008~2010. The experimental plots within whole crop barley or rye were consisted of 7 treatments, which were non-fertilizer, chemical fertilizer (P+K), chemical fertilizer (N+P+K), organic fertilizer, cattle slurry, cattle slurry with hairy vetch, and cattle slurry with forage pea. Each plot was triplicates and experimental treatments were allocated in the randomized complete block design. For whole crop barley, annual mean dry matter (DM) and total digestible nutrients (TDN) yields were the highest in N+P+K plots, but there were no significant differences among organic fertilizer, cattle slurry and mixed sowing with legumes. The TDN and RFV were the highest in mixed sowing plots of forage pea plus cattle slurry application. As 450 kg Hanwoo heifers were fed diets included 70% whole crop barley, organic fertilizer, cattle slurry application and mixed sowing with legumes plots is capable of raising average 2.5 to 2.9 heads/ha a year. For whole crop rye, annual DM, crude protein, and TDN yields of application groups and mixed sowing treatment with legumes showed 6.69~7.13, 0.46~0.51 and 3.95~4.18 ton/ha, respectively. In case of 450 kg Hanwoo heifers fed diets included 70% forage rye, it is estimated that cattle slurry application (mixed sowing with legumes) plots can rear average 3.1~3.3 heads/ha a year. It can be concluded that, on the basis of DM yield, not only mixed sowing with legumes by applying cattle slurry rather than single sowing of whole crop barley or whole crop rye enhanced production yield and feed values, but also it could be a substitute for imported grains as dietary protein sources in the case of feeding Hanwoo.
Kim, Hye Soo;Park, Hyun-Young;Kwon, Hyun-Sook;Lee, Sang-Ho;Ha, Jun;Lee, Sang-Won;Cho, Soo-Jeong
Journal of Mushroom
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v.17
no.4
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pp.261-267
/
2019
The objective of this study was to evaluate the antioxidant activity of extracts of Protaetia brevitarsis larvae fed on fermented oak sawdust (FOS) or spent mushroom substrates (SMS, Pleurotus eryngii). Total polyphenol content was 32% higher in extracts of larvae fed on SMS (P. eryngii) (75.33±0.43 mg GAE/g) than in extracts of larvae fed on FOS (57.02±1.73 mg GAE/g). The flavonoid content of extracts of larvae grown on FOS and SMS (P. eryngii) was 24.6±0.28 mg/g and 25.4±0.75 mg/g, respectively. DPPH radical scavenging activity increased in an extract concentration-dependent manner, and the DPPH radical scavenging capacity of the extract of larvae produced on SMS (P. eryngii) was higher than that of the larvae produced on FOS. The reducing power of the larval extracts produced on FOS and SMS (P. eryngii) increased in an extract concentration-dependent manner, but there was no significant difference between them. The extract of larvae fed on SMS (P. eryngii) (66.55±0.99 uM TE/g) had a higher oxygen radical absorbance capacity (ORAC) than extracts of larvae grown on FOS (76.32±0.48 uM TE/g). The effect of larval extracts on cell proliferation was investigated using a WST-1 (4-[3-(4-iodophenyl)-2-(4-nitrophenyl)-2H-5-tetrazolio]-1,3-benzene disulfonate) assay on RAW 264.7 cells. When cells were treated with larval extracts produced on FOS and SMS (P. eryngii) at concentrations of 0, 2, 4, 8, 16, 32, 40, and 64 mg/ml, RAW 264.7 cells proliferated at 90% or more. Therefore, larval extracts produced on FOS and SMS (P. eryngii) were not toxic to RAW 264.7 cells.
This study was conducted to determine effects of supplementation levels of aqueous direct-fed microbials (DFM; Bacillus spp.) to TMR(exp. 1.) and aqueous DFM addition under the various ratios of starch and cellulose(exp. 2.) on ruminal fermentation and fibrolytic enzyme activity. In experiment 1, ruminal fluids taken from rumen-cannulated Holstein cows were incubated during 24 hr by using TMR as substrates. Aqueous DFM was applied at a rate of 0, 0.025 and 0.05%, respectively. The pH of 0.025% treatment was not significantly different from that of control at 6 and 9 hr, but it was significantly lower (P<0.05) than 0.05% treatment. Concentrations of ammonia-N and VFAs were not affected by supplementing aqueous DFM. The A:P ratio of 0.05% treatment was significantly increased(P<0.05) by supplementation of aqueous DFM as compared with that of control at 24 hr. Although overall fibrolytic enzyme activities were not significantly affected by supplementing aqueous DFM, CMCase(carboxymethylcellulase) activity showed significant increase(P<0.05) compared to control at 6hr. However, the xylanase activity of 0.05% treatment significantly decreased(P<0.05) at 12 hr due to the application of aqueous DFM. There was no significant difference for in vitro dry matter disappearance among treatments. In experiment 2, ruminal fluids were incubated under the condition of various ratios of starch to cellulose(90:10, 70:30, 50:50, 30:70 and 10:90) with or without aqueous DFM(0.025%). Ruminal pH was unaffected by the addition of aqueous DFM, however, as increased level of starch, ruminal pH partially showed significant decrease(P<0.05). Ammonia-N concentration was not affected by aqueous DFM and ratio of starch and cellulose. On 9 hr incubation, DFM addition at a ratio of 70:30 showed significantly (P<0.05) lower value of ammonia-N(35.65 mg/dL) than that(65.05 mg/dL) of control. Concentrations of VFAs were significantly increased(P<0.05) by aqueous DFM addition compared with control at the same ratio on 6 hr incubation. The overall CMCase activity was not affected by aqueous DFM addition. However, the xylanase activity by aqueous DFM partially showed significant differences at the ratios of 90:10, 30:70 and 10:90. Our results indicated that supplementation of aqueous DFM did not significantly improve in vitro fermentation and fibrolytic enzyme activity. In addition, the DFM utilized in this study did not show consistent results by having various effects on ruminal fermentation under different feeding regimens.
Lee, J.I.;Lee, J.D.;Ha, Y.J.;Jung, J,D.;Lee, J.W.;Lee, J.R.;Kwack, S.J.;Kim, D.H.;Do, C. H.
Journal of Animal Science and Technology
/
v.46
no.6
/
pp.1013-1022
/
2004
This study investigated the effects of silkworm droppings(SWD) added diet feeding on chemical composition of pork loin meat. Pigs were divided into 7 treatment groups(10 pigs/group) and subjected to one of seven treatment diets(O, 1 0/0, 2 0/0, 3% SWD for 4 weeks, 1 0/0, 2 0/0, 3% SWD for 8 weeks, SWD diets; total fed diets) before slaughter. Pork loin were collected from the animals(1l0 kg body weight) slaughtered at a commercial slaughter house. Pork loin meat were aerobic packaged and then stored at$4^{\circ}C$ for 2, 5, 8, or 12 days. Samples were analyzed for TBARS, sensory evaluation, myoglobin content, fatty acid composition, amino acid and mineral content. TBARS value was not significantly different between the control and SWD treatment groups. Myoglobin content of SWD fed group pork was significantly increased than that of control group(P<0.05). Marbling score and acceptability were increased in SWD fed pork compared to those in control pork. Na, Mg, Ca, Mn and Fe content of SWD fed group pork was significantly decreased than those of control group(P<0.05). P content was significantly increased than that of control group(P< 0.05). In the change of amino acid composition, the contents of aspartic acid, serine and tyrosine were decreased by dietary SWD-supplementation, whereas the SWD-supplementation resulted in the higher glutamic acid, alanine and isoleucine. As dietary SWD was increased in feed, the content of oleic acid was significantly increased, but stearic acid was significantly decreased(P<0.05).
Two trials at different body weights of Hanwoo heifers (average body weight of 143 and 257 kg, respectively) were conducted to determine crude protein requirements for maintenance (CPm). Six Hanwoo heifers in each trial were used in two 3 ${\times}$ 3 Latin square design with three diets containing three levels of CP, 14 days in each period. In trial 1, the diets were based on 2.8 kg fresh wt./day/heifer timothy hay (LCP) with supplements of either 250 g ground corn and 150 g corn gluten meal (MCP) or 500 g ground corn and 300 g corn gluten meal (HCP). In trial 2, the diets were based on 4.8 kg fresh wt./day/heifer timothy hay (LCP) with supplements of either 350 g ground corn and 250 g corn gluten meal (MCP) or 700 g ground corn and 500 g corn gluten meal (HCP). In trial 1, CP intakes were 236.6, 340.1, and 459.8 g/d for LCP, MCP, and HCP, respectively. Crude protein balances were 0.51, 1.87 and 3.20g/$BW^{0.75}$/d for LCP, MCP, and HCP, respectively. In trial 2, CP intakes were 415.2, 606.9 and 793.0g/d for LCP, MCP and HCP, respectively. Crude protein balances were 0.67, 1.03, 2.99 g/$BW^{0.75}$/d for LCP, MCP, and HCP, respectively. The maintenance requirements for CP from the regression equation between CP intake and CP balance were 4.58g/$BW^{0.75}$/d (trial 1) and 5.02 g/$BW^{0.75}$/d (trial 2) and lower than the value (5.56 g/$BW^{0.75}$/d) adopted by Korean Feeding Standards for Hanwoo (2007).
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