• Proceedings of the Korean Society for Food Science of Animal Resources Conference
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• 2004.10a
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• pp.278-282
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• 2004

본 연구는 오리고기의 사육일령에 따른 부위별 화학적 특성을 구명하고자 실시하였다. 오리고기의 단백질 함량은 70일령의 가슴 및 다리 육이 각각 21.13, 19.61%로 45일령보다 높게 나타났다. 지방은 45일령의 가슴 육이 1.04%이었으나 70일령에서는 1.38%로 약간 증가하는 경향을 나타내었다. 무기물에서 칼슘(Ca)의 함량은 가슴 및 다리 육에서 $142.1{\sim}161.1ppm$ 으로 큰 차이를 보이지 않았고, 사육일령에 따라서 가슴 육은 사육일령이 증가할수록 약간 증가한 것으로 나타났다. 칼륨(K)의 함량은 가슴 육에서 45일령이 1469.7ppm이고 70일령 1883.1ppm으로 약간 증가하는 것으로 나타났다. 아미노산에서 methionine은 가슴 및 다리 육에서 0.43, 0.46%로 다리 육에서 약간 많이 함유하고 있었으나, 사육 일령에서는 상호 차이가 없었다. Glutamic acid는 가슴 육보다 다리 육에서 약간 더 많이 함유하는 것으로 나타났다. 콜라겐 함량은 45일령의 가슴살에서 0.65, 70일령 0.77g/100g으로 사육일령이 증가함에 따라 많았다. 껍질을 제거한 날개 육에서는 45일령이 1.98이었고 70일령이 2.13g/100g으로 70일령이 0.15g/100g 이상 많았다. 콜레스테롤은 가슴육의 45일령이 10.45, 70일령이 11.28mg/100g으로 사육일령이 증가함에 따라 약간 증가하는 경향을 나타냈다.

• Proceedings of the Korean Society of Developmental Biology Conference
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• 2003.10a
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• pp.129-129
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• 2003

번식효율이 높은 우수한 후보종빈돈의 조기선발기술을 개발하기 위해 후보종빈돈의 첫발정일령과 첫수정일령에 미치는 요인을 분석한 결과는 다음과 같다. 본 시험에 공시된 후보종빈돈은 충남 천안시에 위치하고 있는 양돈장에서 자돈을 생산ㆍ육성하여 체중 80~90kg에서 선발하였고, 체중이 약 110kg 도달하였을 때 최종 선발하여 이용하였으며, 사양관리는 양돈장의 관행에 따라 실시하였다. 첫발정조사는 생후 22주령때 부터 매일 아침, 저녁으로 2회씩 외음부의 충혈과 부종상태를 관찰하고 승가허용 자세유지 등을 통하여 발정여부를 조사하였다. 교배는 첫발정발견 후 2차 발정이 발현되었을 때 실시하는 것을 원칙으로 하였다. 첫발정 및 첫수정시에 등지방측정기(Lean-meater; Renco, U.S.A.)를 이용하여 제 10늑골의 정중선으로부터 좌측 또는 우측으로 약 5cm 이격된 지점을 2회 측정하여 평균치로 하였다. 후보종빈돈의 품종별 첫발정일령과 첫수정일령은 랜드레이스종이 171.91일과 202.18일, 요크셔종은 178.56일과 208.39일, 랜드레이스종과 요크셔종의 F$_1$은 190.20일과 213.60일로 랜드레이스종이 첫발정일령과 첫수정일령이 가장 빨랐으나 품종간 첫수정일령에 대한 유의적인 차이는 없었다. 출생계절별 첫발정일령 및 첫수정일령은 봄에 출생한 후보종빈돈은 194.14일 및 222.05일, 여름에 출생한 후보종빈돈은 163.25일 및 193.00일, 가을에 출생한 후보종빈돈은 160.25일 및 199.20일, 겨울에 출생한 후보종빈돈은 159.72일 및 190.11일로 봄에 출생한 후보종빈돈의 첫발정일령 및 첫수정일령이 겨울, 가을, 여름에 출생한 후보종빈돈보다 유의적으로 늦게 나타났다(P〈0.01). 등지방두께가 13~16mm인 후보종빈돈의 첫발정일령 및 첫수정일령은 180.32일 및 211.12일, 17~20mm인 후보종빈돈은 172.24일 및 202.43일, 21~23mm인 후보종빈돈은 162.20일 및 195.43일로 등지방두께가 얇을수록 첫발정일령 및 첫수정일령이 지연되었으나 유의적인 차이는 인정되지 않았다.

• Proceedings of the Korea Society of Poultry Science Conference
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• 2002.11a
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• pp.126-127
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• 2002

본 시험은 게르마늄 침지수 및 사료 첨가급여가 육용오리의 생산능력에 미치는 영향을 구명하기 위하여 1~10 일령에 자연수 또는 게르마늄 침지수를 공급하는 2개 요인에 각각 10~42일령 사료에 게르마늄을 0.0, 0.5 및 1.0% 첨가하는 3개 수준을 조합한 6개 처리에 180수의 육용오리를 2$\times$3요인 배치하여 42일간 사양시험을 실시한 결과는 다음과 같다. 42일령 체중과 1~42일령간의 증체량은 1~10일령 간의 게르마늄 침지수 공급으로 향상되지 않았으며, 10일령 이후 사료의 게르마늄 첨가수준이 1.0%까지 증가함에 따라 점차 증가되는 경향이었으나, 통계적인 유의성은 없었다. 42일령까지의 전 기간 평균 사료요구율도 1~10일령간의 게르마늄 침지수 공급으로 향상되지 않았으며, 10일령 이후 사료에 게르마늄을 0.5% 첨가하였을 때 가장 우수하였으나, 역시 처리간에 유의적인 차이는 인정되지 않았다. 42일간의 사육기간 중 폐사율은 전반적으로 낮았고 처리간에 유의적인 차이가 없었으며, 42일령의 도체율은 사료의 게르마늄 첨가수준이 증가할수록 증가하는 경향을 보였으나 역시 유의적인 차이는 없었다.

• Korean Journal of Poultry Science
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• v.29 no.1
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• pp.25-35
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• 2002

Two experiments were conducted to studs the effects of early-life feed restriction, ages and duration on compensatory growth, feed efficiency, and abdominal fat pad deposition in broilers. The chicks were randomly assigned to four treatments (experiment 1) or seven treatments (experiment 2) . Each dietary treatment was replicated with three floor pens in both experiments, and twenty chicks were assigned to each pen. In experiment 1, birds in control group (C) were full-fed throughout the study. For treatments 1, 2, and 3, bards were fed diets containing 0.75 kcal ME/gB $W^{o.67}$/d for 3 d(T1), 1.5 ㎉ ME/gB $W^{o.67}$/d for 5 d (T2), and 2.25 local ME/gB $W^{0.67}$/d for 7 d (T3), all imposed beginning at 7 d of age. The selected value seems appropriate for maintenance feeding because the feed restriction at T1 resulted no growth in virtually. Although the birds previously subjected with restricted feeding significantly (P<0.05) enhanced growth partly (in 22~49 d), the weight gain over the entire growth period (7-49 d) was not influenced by the restricted feeding Programs. Whereas, the restricted feedings had effects with significant (P<0.75) increase in feed intake not only in 22~49 d, but in overall period (7-49 d). The feed conversion for the birds previously subjected with restricted feeding was significantly (P<0.05) improved after 21 d. The birds with restricted feedings (T1,T2,T3) showed better (P<0.05) feed conversion ratio than C both in 22-49 d and in 7-49 d. The restricted feeding programs did not show effects in reducing for abdominal fat pad deposition or mortality In experiment 2, the birds of C were full-fed in overall period. But for treatments 1, 2, 3, 4, 5, and 6 (T1-T6),the birds were fed diets containing 0.75 ㎉ ME/gB $W^{0.67}$/d for 3 or 5 d, starting at either 4, 7 or 10 d of age. The selected value seems appropriate for maintenance feeding because the feed restriction resulted no growth in virtually; which was same as experiment.

• Proceedings of the Korean Society of Developmental Biology Conference
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• 2003.10a
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• pp.130-130
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• 2003

번식효율이 높은 우수한 후보종빈돈의 조기선발기술을 개발하기 위해 후보종빈돈의 첫발정일령과 첫수정일령 및 첫수정시 등지방두께가 산자수에 미치는 요인을 분석한 결과는 다음과 같다. 본 시험에 공시된 후보종빈돈은 충남 천안시에 위치하고 있는 양돈장에서 자돈을 생산ㆍ육성하여 체중 80∼90kg에서 선발하였고, 체중이 약 110kg 도달하였을 때 최종 선발하여 이용하였으며, 사양관리는 양돈장의 관행에 따라 실시하였다. 첫발정조사는 생후 22주령때부터 매일 아침, 저녁으로 2회씩 외음부의 충혈과 부종상태를 관찰하고 승가허용 자세유지 등을 통하여 발정여부를 조사하였다. 교배는 첫발정발견 후 2차 발정이 발현되었을 때 실시하는 것을 원칙으로 하였으며, 수퇘지를 허용하는 시기에 액상적액으로 1차 인공수정하고, 12시간후 2차 인공수정을 실시하였다. 첫수정시에 등지방측정기 (Lean-neater; Renco, U.S.A.)를 이용하여 제 10늑골의 정중선으로부터 좌측 또는 우측으로 약 5cm 이격된 지점을 2회 측정하여 평균치로 하였다. 산자수는 미이라 등을 제외하고 정상적으로 성장하여 분만한 복당자돈수를 조사하였다. 첫발정일령이 160일령이하일때에 산자수는 9.64두였으며, 161∼180일렬인 경우 10.14두, 181∼200일령인 경우 9.56두, 201일령이상인 경우 9.13두로 첫발정일령이 161∼180일이었을때가 산자수가 가장 많았으나 유의적인 차이는 없었다. (중략)

• Food Science of Animal Resources
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• v.26 no.1
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• pp.9-14
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• 2006

The aim of this study was to determine the chemical traits of duck meats with different rearing periods(45 70 days). The content of protein was 21.3 and 19.61% in the breast and leg at 70 days post hatched, respectively. Group at 70 days showed high protein composition than those of 45 days group. The content of fat was slightly increased with the rearing periods. The composition of Ca, mineral compound, was not showed the difference between leg and breast meat. However, it was increased with the rearing periods. The composition of Fe was not significantly different in the breast meat. However, there was a significant increase in the leg (p<0.05). It was compared 14.6 ppm at 45 days group to 27.5 ppm at 70 days group. The content of methionine was significantly increased in the breasts due to the increasing rearing periods (p<0.05), but not in leg meat. There was no significant difference between parts, but glutamic acid content was significantly decreased along with the increasing rearing periods (p<0.05). The content of collagen at 70 days(0.77 g/100 g) was higher than those of 45 days(0.65 g/100 g). It was affected by the rearing periods In the wing-removed skit, it was 0.15 g increases at 70 rearing period group. The cholesterol content was significantly increased in the leg but not in the breast. With the rearing periods, it was significantly increased in the leg (p<0.05).

• Journal of Embryo Transfer
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• v.17 no.3
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• pp.195-201
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• 2002

This study was to assess the developmental capacity of oocytes matured in vitro after 20, 15, 10, 5 and 0 days of organ culture when ovaries were isolated from juvenile mice at 0-, 5-, 10-,15- and 20-day old, respectively, and to develop in vitro culture system that observed a view to morphology of ovaries and nucleus maturation of oocytes. The size of ovaries decreased 35.9%, 8.7%, 1.2% and 14.4% after 20, 15, 10, 5 days of organ culture when the ovaries were isolated from 0-, 5-, 10 and 15-day old mice, respectively. After organ culture, the recovery rates, diameters of oocytes and the number of oocytes progressed from GV to MII were increased as increasing age of mice.

• Korean Journal of Poultry Science
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• v.47 no.4
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• pp.267-274
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• 2020

This study was conducted to estimate genetic parameters for growth and egg production traits in Black Korean native chicken (L strain) and Korean White Leghorn (F, K strains) using a multi-traits animal model BLUP. Traits used for this study were body weight at 150 days (BW150) and 270 days (BW270), age at first egg (DAY1st), egg weight at first egg (EW1st) and 270 days (EW270), and number of eggs laid by 270 days (EP270), and included 68,688 pedigree and 123,905 performance records collected from 2001 to 2013. In L, F, K strains, heritability estimates of BW150 were high (0.48, 0.52 and 0.50, respectively); of BW270 were high (0.56, 0.57 and 0.56); of DAY1st were medium to high (0.45, 0.39 and 0.31); of EW1st were low (0.15, 0.16 and 0.15); of EW270 were high (0.58, 0.55 and 0.59) and of EP270 were moderate (0.22, 0.21 and 0.20). The genetic and phenotypic correlation of DAY1st with EP270 were highly negative (-0.73 to -0.63 and -0.48 to -0.42). The genetic and phenotypic correlation of EP270 with BW150 and BW270, respectively were low negative (-0.16 to 0.01 and -0.14 to -0.03) and low to moderate positive (-0.08 to 0.07 and -0.13 to 0.04). The genetic and phenotypic correlation of EW270 with BW150 and BW270, respectively were moderate to high positive (0.39 to 0.49 and 0.36 to 0.46) and (0.29 to 0.33 and 0.34 to 0.37). The study showed that there is a potential for genetic improvement of Korean Indigenous chicken through selection program.

• Korean Journal of Poultry Science
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• v.48 no.1
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• pp.31-39
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• 2021

We aimed to investigate the age-dependent development of digestive organs, intestinal enzymes, and hepatic antioxidant defense system in White Leghorn chicks aged 0, 3, 7, 14, and 21 days. Body weight (BW) did not significantly change between days 0 and 7 but significantly increased (P<0.05) after day 7. The relative liver weight (g/100 g of BW) was significantly lower at day 0 than at the other ages but markedly increased at days 3 and 7 (P<0.05). The relative pancreatic weight changed similar to the change in liver weight, with the maximum development at 7 days (P<0.05). The relative intestinal and mucosal tissue weights increased rapidly after hatching (P<0.05), with the maximum growth at 7 days. Furthermore, maltase and sucrase activities were significantly higher at day 3 than at day 0 (P<0.05). Leucine aminopeptidase activity was high at day 0 and remained constant as age increased. Superoxide dismutase and glutathione S-transferase activities in the liver were the lowest at day 0 but significantly increased after 7 days (P<0.05). Glutathione peroxidase activity increased significantly after day 14 compared with that at days 0 and 7 (P<0.05). Lipid peroxidation was not affected by age. In conclusion, the digestive organ weights and hydrolase activity of chicks increased rapidly during the first 3 or 7 days post-hatching. Hepatic antioxidant enzyme activity increased simultaneously with the increase in digestive organ weights, after 7 days.

• Korean Journal of Poultry Science
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• v.51 no.2
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• pp.107-116
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• 2024

The study was conducted to examine age-related development of digestive organs, intestinal microvilli hydrolase, and hepatic antioxidant enzyme in Korean native chicks (KNC) aged from 0-d to 28-d of post-hatching. Body weight did not significantly increase from 0-d to 3-d-old, but after that remarkably increased from 3-d to 28-d-old (P<0.05). The relative weight (g/100 g of BW) of the proventriculus, gizzard, and liver was significantly higher at 3- and 7-d-old chicks than that of the other ages. The relative weight of the intestine, mucosal tissues, and pancreas was markedly developed at the ages of 3-, 14-, and (or) 21-d-old chicks (P<0.05). In the small intestine, the specific activities of maltase and sucrose were significantly higher at 14-d-old compared with the other ages (P<0.05). Leucine aminopeptidase activity showed a constant level from 0- to 28-d-old without significance. The specific activity of alkaline phosphatase was significantly higher at 0-d-old compared with the other ages (P<0.05). In the liver, the specific activities of superoxide dismutase, glutathione peroxidase, and glutathione S-transferase were shown to be lowest at 0-d-old, but they continued to increase as the age increased. The lipid peroxidation was significantly high at the age of 21-d (P<0.05), after that its level decreased at 28-d old. In conclusion, the KNC rapidly developed digestive organs and intestinal microvilli hydrolase activity from 3- to 14-d-old after hatching. Hepatic antioxidant enzyme activity continued to increase as the age increased after hatching, resulting in 28-d-old chicks showing the highest antioxidant enzyme activity in the KNC.