• 한국가금학회지
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• 제27권1호
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• pp.79-84
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• 2000

This study was carried out to investigate the characteristics of semen and egg storage period on hatchability of Korean native chicken(KNC, 44-wk old). The body weight, volume of semen, concentration of spermatozoa, total sperm of an ejaculate, motility of sperm and percentage of fertile eggs were 2,555.89g, 0.473$m\ell$, 30.81${\times}$10(sup)8/$m\ell$, 13.14${\times}$10(sup)8 cells, 3.58 and 91.69%, respectively, in KNC. The percentage of fertile eggs were 87.9∼96.0% on storage period in KNC. The viability and hatchability were 80.2%. 74.6%, respectively, in storage period for 22 days in storage temperature of 11∼14$^{\circ}C$. The results of the trial show that viability can be get more than 80% in storage period for 3 weeks in storage temperature of about 13$^{\circ}C$.

• 한국가금학회:학술대회논문집
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• 한국가금학회 2006년도 제23차 정기총회 및 학술발표회
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• pp.64-65
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• 2006

The effects of garlic extracts, lactic acid bacteria, copper and selenium as cholesterol lowering material on productivity and content of egg cholesterol in layer were investigated. The layers were divided into seven treatment groups and fed commercial diet or experimental diets containing probiotics, garlic powder, selenium and copper for 6 weeks. There was no significant difference in egg production between groups. The content of egg yolk cholesterol by combination feeding of probiotics, garlic powder, selenium and copper were significantly reduced by 13.5-29.8% as compared to that of control. The levels of mRNA expression of HMG-CoA reductase were significantly decreased by dietary treatments.

• 한국가금학회:학술대회논문집
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• 한국가금학회 2001년도 제18차 정기총회 및 학술발표 PROCEEDINGS
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• pp.56-57
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• 2001

In Experiment 1, two hundred eighty 32wks old ISA brown layers were assigned to seven dietary treatments for 4weeks. Each treatment was consisted of 4 replications with 10 birds per replication. Control diet was formulated 10%CP 2,750KcalME/kg. Euglena bleached(DHA enriched) at the level of 0.5, 1.0, 2.0% in the diet. In Experiment 2, three hundred 84wks old ISA brown layers were assigned to seven dietary treatments: T1; Control, T2; T1 ＋ Euglena bleached(DHA enriched)0.5%, T3; T1 ＋ Euglena gracilis(DHA enriched)0.5%, T4; T1 ＋ Euglena gracilis(DHA enriched)1.0%, T5; T1＋Euglena gracilis(DHA enriched)2.0%. In Experiment 1, 2.0% Euglena bleached treatment showed highest DHA level in Egg yolk(P＜0.05). In Experiment 2, 0.5% Euglena bleached treatment showed highest DHA level in Egg yolk(P＜0.05).

• Asian-Australasian Journal of Animal Sciences
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• 제31권11호
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• pp.1766-1772
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• 2018

Objective: This experiment was to investigate the effect of increasing levels of apparent metabolizable energy ($AME_n$) on the laying performance, egg quality, blood parameters, blood biochemistry, intestinal morphology, and apparent total tract digestibility (ATTD) of energy and nutrients in diets fed to laying hens. Methods: A total of three-hundred twenty 33-week-old Hy-Line Brown laying hens (Gallus domesticus) were evenly assigned to four experimental diets of 2,750, 2,850, 2,950, and 3,050 kcal $AME_n/kg$ in pens with floors covered with deep litter of rice hulls. There were four replicates of each treatment, each consisting of 20 birds in a pen. Results: $AME_n$ intake was increased (linear, p<0.05) with inclusion level of $AME_n$ in diets increased. Feed intake and feed conversion ratio were improved (linear, p<0.01), but hen-day egg production tended to be increased with an increasing level of $AME_n$ in diets. During the experiment, leukocyte concentration and blood biochemistry (total cholesterol, triglyceride, glucose, total protein, calcium, asparate aminotransferase, and alanine transferase were not influenced by increasing level of $AME_n$ in diets. Gross energy and ether extract were increased (linear, p<0.01) as the inclusion level of $AME_n$ in diets increased. Conclusion: Laying hens fed high $AME_n$ diet (i.e., 3,050 kcal/kg in the current experiment) tended to overconsume energy with a positive effect on feed intake, feed conversion ratio, nutrient digestibility, and intestinal morphology but not on egg production and egg mass.

• 한국가금학회지
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• 제16권3호
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• pp.157-167
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• 1989

난백으로부터 lysozyme을 효과적으로 추출하기 위하여 난백의 전처리와 이온교환수지의 선택 및 전처리 등 추출조건에 관한 연구를 실시한 결과는 다음과 같다. 난백의 점도저하를 위하여 2,000 rpm의 속도로 30분간 균질하고 45분간 초음파처리를 실시한 결과 난백의 겉보기 점도가 3 cp까지 떨어졌으나 pH의 변화에 따라서는 점도의 차이가 크지 않았다. lysozyme의 추출을 위한 이온교환수지의 선택을 위하여 Amberlite IRC-84 등 6종류의 수지에 대한 Lysozyme 흡착력을 검토한 결과 CM-Sepdex C-25＞Duolte C-464＞Amberlite C-50＞Dowex MSC-1＞Amberlite IRC-50＞Amberlite IRC-84의 순으로 lysozyme 흡착력이 높았으나 난백에의 적용시 CM-Sephadex C-25의 경우에는 난백의 유출이 용이하지 않은 것으로 나타나 Duolite C-464가 가장 적합한 것으로 나타났다. 양이온교환수지인 Duolite C-464 의 양이온형태 결정을 위하여 $Na^{＋}$, $NH_4$$^{＋}$. $K^{＋}$ form으로 만들어 lysozyme 흡착력을 검토한 결과 $Na^{＋}$ ＞ $NH_4$$^{＋}$ ＞ $K^{＋}$의 순으로 나타나 $Na^{＋}$ form으로 하는 것이 가장 효과적인 것으로 나타났다. Duolite C-464의 $Na^{＋}$form을 이용하여 lysozyme을 추출할 경우 rinse buffer는 pH6.5의 0.1M sodium phosphate buffer, eluting solution은 10% ammoniun sulfate가 효율적이었다. Lysozyme을 추출한 전, 후 난백의 가공적성을 측정한 결과 기포력은 추출전의 난백액에 대하여 85.3%로서 다소 떨어졌으나 가열한 난백겔의 경우에는 추출전, 후 색택의 변화가 크지 않았으며 조직감의 경우에도 hardness가 다소 떨어졌으나 elasticity는 오히려 13%가량 증가되었다.

• 한국가금학회지
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• 제16권3호
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• pp.129-137
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• 1989

본 연구는 한국재래오골계의 효율적인 선발 및 육종계획을 위한 주요경제형질에 대한 유전모수를 추정하고자 1987년 6월 18일부터 1989년 2월 6일까지 사육검정 되어온 한국재래오골계의 주요경제형질에 대한 자료를 분석하여 얻어진 결과를 요약하면 다음과 같다. 1. 체중은 8주, 300일영 및 500일영 체중이 각각 574.54, 1,490.96, 1,753.47 및 2,013.31 g이었고, 초산일영은 171.29일이었으며, 산난수는 300일영 및 500일영시에 각각 80.12, 162.82개이었으며, 난중은 초산시, 300일영 및 500일영시에 각각 40.03, 49.92 및 55.59 g이었다. 2. 유전력 추정치에 있어서는 부분산성분, 모분산성분 및 부모분산성분에서 체중은 각각 0.441∼0.661, 0.120 ∼0.490 및 0.345∼0.465이었으며, 초산일영은 각각 0.356, 0.207, 0.282이었고, 산난수는 각각 0.354∼0.362, 0.204∼0.230 및 0.279∼0.296이었으며, 난중은 각각 0.259∼0.464, 0.512∼0.633 및 0.356∼0.540이었다. 3. 주요경제형질들간의 유전상관은 체중과 초산일영간에 0.539∼0.617로 대체로 높은 정의 계수이었고, 체중과 산란수간에는 -0.520∼-0.157로 부의 상관인 반면에, 난중간에는 0.180∼0.754로 정의 계수이었고, 초산일영과 산란수간에는-0.717로 높은 부의 계수인 반면에, 난중과는 0.552∼0.587로 다소 높은 정의 계수이었고, 산란수와 난중간에는 -0.383∼-0.381로 부의 추정치 이었다.

• 한국가금학회:학술대회논문집
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• 한국가금학회 2004년도 제21차 정기총회 및 학술발표회
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• pp.93-94
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• 2004

The experiments was conducted to investigate the effects of dietary supplementation of feather meal and pyridoxine on the taurine content of egg yolk and performance of laying hens. Feeding trial was conducted with 900 31-wk-old Hy-Line Brown layers for 4wks. The experiment consisted of six dietary treatments: control(basal diet), feather meal(FM) 3 % diet(FM 3 %), FM 3 % + pyridoxine supplemented diet(FM 3 % + Pyridox), FM 6 % diet, FM 6 % + pyridoxine supplemented diet(FM 6% + Pyridox), Synthetic taurine 0.25 % supplemented diet(Taurine). Egg production of birds fed FM 3% was highest and those of the FM diets were also higher than those of Taurine and the control. Egg weight of Taurine was significantly lower than those of FM 3 %, FM 6 % and the control but were not significantly different from those of FM 3 % + Pyridox or FM 6 % + Pyridox. Feed intake of the control was greater than those of FM 6 %, FM 6% + Pyridox or Taurine treatment but was not significantly different from those of FM 3 % and FM 3 % + Pyridox. Feed conversion of the control was significantly higher than other treatments in which that of FM 6 % was lowest. Broken and soft egg production of Taurine was highest while that of the control was lowest among treatments. Taurine content of egg yolk significantly increased by supplementation of taurine(64.7 %). FM 6 % + pyridoxine(57 %), FM 3% + pyridoxine (32.1%) and FM 6% (16.6 %). Sensory evaluation data of Taurine has shown the highest score in most of sensory attributes. It is concluded that taurine can be enriched in egg yolk by supplementation of 6 % FM diet and pyridoxine as well as 0.25 % synthetic taurine.

• 한국가금학회지
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• 제22권2호
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• pp.77-84
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• 1995

In order to investigate the effect of feeding live yeast culture on the performance of laying hens, a feeding trial was conducted with 96 20-wk-old Hy4ine brown layers during their laying period of 60 wk. The live yeast culture used was a product from Saccharomyces cerevisiae that was cultured on the corn-based substrate followed by careful drying of whole material not to lose the viability of yeast. Three levels of yeast culture as 0.5, 1.0, and 2.0% for three treatments and 0% for the control were included in the experimental diets. The feeding trial was carried out for 60 wk from August 26, 1992 to October 26, 1993. To evaluate the performance of layers during cold or hot periods as affected by the yeast culture feeding, data from the 12-wk winter period and 12-wk summer period were separated and analyzed accordingly. During 60 wk of laying period hen-day egg production was slightly but significantly(P<.05) improved by feeding the yeast culture. The average egg weight and daily egg weight(g /day) were also increased by the yeast culture. Feeding the yeast culture did not increase feed intake but feed efficiency was improved significantly (P<.05). No significant difference was detected in egg or eggshell qualities between control and yeast culture-treated groups. Feed intake and egg weight were not affected by the yeast culture feeding under both cold and hot period, but egg production and feed efficiency during hot summer improved significantly by its feeding. This result indicates that the effectiveness of the yeast culture feeding is greater during summer than winter for laying hens.

• 한국가금학회지
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• 제14권2호
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• pp.125-135
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• 1987

본 시험은 산란계사료의 에너지 및 단백질 수준이 하절기에 있어서 갈색 산란계의 생산성에 미치는 영향을 구명하기 위하여 대사에너지 3수준(2,500, 2700 및 2900Kcal/kg)과 단백질 3수준(13, 15 및 17%)을 조합한 9개처리에 24주령된 Warren 산란계 720수를 공시하여 1983년 6월 3일부터 동년 8월 25일까지 12주간에 걸쳐 시험을 실시한 바 그 결과는 다음 요약과 같다. 1. 산란율은 에너지 수준이 증가할수록 점차 저하되었고 단백질 수준이 증가할수록 점차 증가하였다. 2. 란중은 에너지 수준에 따라서 큰 차이가 없었으나 단백질 수준이 증가할수록 증가하였다. 3. 사료섭취량은 에너지 수준이 증가할수록 점차 감소하였으나, 단백질 수준에 따라서는 차이가 없었다. 4. 사료요구율은 단백질 수준이 증가할수록 점차 개선되었다. 5. 폐사율은 사료중의 에너지 및 단백질 수준에 영향을 받지 않았다. 6. 1일수당 에너지 섭취량은 사료중의 에너지 수준이 증가할수록 점차 증가하였다. 7. 산란 kg당 대사에너지 요구량은 에너지 수준이 증가할수록 점차 증가하였으며 단백질 수준이 증가할수록 감소하였다. 8. 산란kg당 단백질 요구량은 에너지 및 단백질수준이 증가할수록 점차 증가하였다. 9. 산란kg당 사료비는 에너지 수준이 증가할수록 점차 증가하였고 단백질 수준이 증가할수록 점차 감소하였다.