• 한국가금학회지
• /
• 제50권1호
• /
• pp.15-22
• /
• 2023

본 연구는 토종 종계의 육성기 체중과 산란 능력 간의 연관성을 규명하고자 성숙 이전 주령별 체중과 이들의 초산일령, 산란율 및 난중과의 상관 관계를 분석하였다. 공시계는 (주)한협원종이 보유한 신품종 토종 종계 1,384수로써 발생부터 20주령까지의 체중과 초산일령, 초산이후 50주령까지의 일계 산란율 및 산란지수, 32주령 및 50주령 난중을 분석 대상으로 하였다. 분석 결과, 육성 초기 체중과 초산일령 간에는 정(positive)의 상관이, 육성 후기 체중과 초산일령 간에는 부(negative)의 상관이 나타났다. 육성기 체중과 일계 산란율 및 산란지수 간에는 비슷한 상관계수를 보이고, 육성전기 체중과 산란율 간에는 부의 상관이, 육성 후기 체중과는 정의 상관을 보였다. 육성기 체중과 32주령 난중 간에는 거의 상관 관계가 없는 것으로 나타났고, 50주령 난중과는 낮은 정의 상관을 보였다. 결론적으로 토종 종계에 있어서 8주령 이전까지의 육성 초기 체중과 산란 능력 간에는 거의 연관성이 없는 것으로 보여지고, 12주령 이후 육성 후기 체중과 산란 능력 간에는 정의 상관이 있는 것으로 나타났다. 이는 육성 후기 때 병아리의 체중이 증가할수록 성 성숙이 빠르고, 산란율도 높고 난중도 증가함을 시사한다. 따라서 토종 종계 모계의 경우 육성 후기 병아리의 체중 관리가 매우 중요하고, 이때 종계들의 체중이 표준 체중 이상이 되도록 유지하여야 한다.

• 한국가금학회지
• /
• 제24권3호
• /
• pp.127-137
• /
• 1997

This study was conducted to estimate the laying performance and heterosis of Korean Native Chicken(KNC), Rhode Island Red(RIR), and KNC x RIR crossbreds A total of 1,274 female pullets were produced from KNC, RIR and RIR crossbreds in National Livestock Research Institute, Korea. The experiment was conducted for 2O~64 weeks from Jan 20. to Nov.25, 1996. The age at first egg of crossbreds were 144.1~148.7 days. The first egg weight of crossbreds was 39. 4~40.3 g, and body weights at first egg of KNC dark brown strain x RlR(DR), KNC light brown strain x RlR(LR) and KNC dark black strain x RlR(BR) were 1,943 g, 1,925 g and 2,044 g, respectively. During the laying period the average viability of crossbreds was 96.6~98.3%. The hen-day egg production of crossbreds were 111.1~113.O eggs at 40 weeks of age, and 223.5~227.5 eggs at 64 weeks of age, respectively. The hen-day egg production peaks were 78.2~80.1% in KNC, and 85.8~87.5% in crossbreds. The heterosis were estimated to be 3.61%, 9.21%, 4.78%, 2.97% and -1.63% for the first egg days, body weights at first egg, layer viability, hen-day egg production, and feed conversion ratio, respectively.

• 한국가금학회:학술대회논문집
• /
• 한국가금학회 2002년도 가을 학술발표논문집
• /
• pp.140-142
• /
• 2002

순수계통으로 유지되는 한국 재래닭 계통간 교배종의 산란형질에 대하여 일반능력과 잡종강세 및 결합능력을 추정한 결과 일반능력은 시산일령, 산란수 및 난중 등 모든 형질에서 순종에 비해 향상을 보였으며, 시산일령, 산란수, 난중 및 난각강도 등에서 접종강세효과가 높았다. 일반결합능력은 시산일령, 산란수, 난형지수 및 난각두께에서, 특수 결합능력은 산란수, 난중 및 난각 두께에서, 상반교잡효과는 산란수, 난형지수 및 난각두께에서 중요하게 나타났다. 형질에 따라 차이가 있었으나 순종에서는 Y계통, 교배종에서는 $Y\times$B조합이 결합능력효과가 높은 편으로 재래닭 개량의 자료로 활용될 수 있을 것으로 사료된다.

• Asian-Australasian Journal of Animal Sciences
• /
• 제27권8호
• /
• pp.1075-1081
• /
• 2014

CRBP1 (cellular retinol binding protein 1) and CRBP3 (cellular retinol binding protein 3), are important components of the retinoid signaling pathway and take part in vitamin A absorption, transport and metabolism. Based on the role of vitamin A in chicken laying performance, we investigated the polymorphism of CRBP1 and CRBP3 genes in 349 chickens using single strand conformation polymorphism and DNA sequencing methods. Only one polymorphism was identified in the third intron of CRBP1, two polymorphisms were detected in CRBP3; they were located in the second intron and the third intron respectively. The association studies between these three SNPs and laying performance traits were performed in Erlang mountainous chicken. Notably, the SNP g.14604G>T of CRBP1 was shown to be significantly associated with body weight at first egg (BWFE), age at first egg (AFE), weight at first egg (WFE) and total number of eggs with 300 age (EN). The CRBP3 polymorphism g.934C>G was associated with AFE, and the g.1324A>G was associated with AFE and BWFE, but none of these polymorphisms were associated with egg quality traits. Haplotype combinations constructed on these two SNPs of CRBP3 gene were associated with BWFE and AFE. In particular, diplotype H2H2 had positive effect on AFE, BWFE, EN, and average egg-laying interval. We herein describe for the first time basic research on the polymorphism of chicken CRBP1 and CRBP3 genes that is predictive of genetic potential for laying performance in chicken.

• 한국가금학회지
• /
• 제22권1호
• /
• pp.7-13
• /
• 1995

To investigate the response of egg production to the artificial light to induce early egg laying. and the changes of egg weight and egg shape during the egg laying cycle, 30 Korean ring-necked pullets and their 1,284 eggs layed under artificial light control were used in this study. The first egg was ohserved at the age of 31 wk, after 4 wk of stimulating light(16 hour light: 8 hour dark). Egg production rate during seven 2-wk periods from the begining of the first egg was 43.7% and a clear peak egg production(61.7%) was shown at the 4th 2-wk period. The effects of egg production period and pullet on the egg weight, egg length, egg width and egg shape index(width/length) were significant(P<0.01). In the egg production cycle. egg weight, egg length and egg width increased steadly with time. but the value of egg shape index increased up to the 3rd 2-wk period and then decreased. Repeatabilities from intraclass correlation for the egg weight, egg length. egg width and egg shape index were 0.61. 0.53, 0.49 and 0.48, respectively.

• 한국가금학회지
• /
• 제40권1호
• /
• pp.17-23
• /
• 2013

본 시험은 토종오리 대형종의 산란초기 성적을 조사하기 위해 수행하였다. 공시동물은 A와 B계통의 20주령 토종오리 168수를 선별하여 이용하였다. 시험설계는 A와 B계통으로 나누어 비교하였으며, 계통 당 6반복, 반복 당 14수씩 완전임의 배치하였다. 시산일령은 평균 154.6일, A와 B계통이 각각 154.5일과 154.7일, 시산난중은 평균 67.3 g, 각각 69.1 g과 65.5 g, 시산 시 체중은 평균 3,146 g, 각각 3,187 g과 3,105 g으로 나타났다. 초산일령은 평균 173.7일, A와 B계통이 각각 175.8일과 171.5일, 초산난중은 평균 75.1 g, 각각 75.2 g과 74.9 g, 초산 시 체중은 평균 3,235 g, 각각 3,245 g과 3,225 g으로 나타났다. 시산일령, 시산 난중과 초산 난중, 시산 시와 초산 시의 체중은 A와 B계통 사이에서 유의적인 차이가 없었다. 초산일령은 B계통이 A계통에 비해 빠르게 나타났다(P<0.05). 체중 및 사료섭취량은 계통 간 유의차가 없었으나, 주령별 체중은 28주령에 가장 높았으며(P<0.05), 주령별 사료섭취량은 26주령 이후로 증가하였다(P<0.05). 평균난중은 사료섭취량과 마찬가지로 A와 B계통간 차이는 없었으며, 26주령 이후 유의적으로 증가하였다(P<0.05). 산란율은 22~24주령에 B계통이 A계통에 비해 높게 나타났으나(P<0.05), 다른 주령에서는 A와 B계통 사이에서 유의적인 차이는 없었다. 산란수는 24주령 이후 30주령까지 B계통이 A계통에 비해 높았으며(P<0.05), 주령별 산란수는 주령에 따라 유의적으로 증가하였다(P<0.05). 사료요구율은 22~24주령에 A와 B계통이 각각 10.7과 6.53으로 A계통이 B계통에 비해 높게 나타났다(P<0.05). 주령별 사료요구율은 20~22주령이 가장 높았으며, 22~24주령까지 유의적으로 감소하였으나, 24주령부터 30주령까지는 낮게 유지되었다. 이런 결과들은 토종오리 대형종의 산란초기 성적에 대한 기초적인 자료로서 이용될 것이라 사료된다.

• 농업과학연구
• /
• 제39권1호
• /
• pp.53-60
• /
• 2012

This work was conducted to evaluate the laying performance of Korean Native Ducks (KND) Pure-Line (PL). A total of 400 female pullets were hatched from PL to keep in National Institute of Animal Science, Korea. Twenty weeks old PL female ducks were divided into 4 groups (5 replications/group, 20 head/replications). Four groups were compared in a $2{\times}2$ factorial arrangement with strain (White strains, WW; Celadon strains, CC) and house type (flat house, cage house). On first egg laying day, CC strain laid eggs earlier compared to WW strain (P<0.01), but there was no significant difference between flat and cage house. Egg weight (EW) and body weight (BW) at first egg laying day have no difference among strains and houses. BW of CC strain was higher than WW strain at the age of 30 week (P<0.01). Weekly feed intake (FI) have no difference between flat and cage house, but FI of WW strain was high compared to CC strain during 20~30 weeks. There was no significant difference on EW between CC and WW strains, but EW was low at flat house compared to cage house (P<0.05). Weekly egg productions of WW strain and flat house were lower than CC strain and cage house, respectively (P<0.01). Finally, These results can provide the information that needed to introducing new strains.

• 한국가금학회지
• /
• 제40권1호
• /
• pp.67-73
• /
• 2013

With an increasing concern on laying hen welfare, barn system has appeared as one of the alternatives to replace the conventional cage. This study was conducted to compare the early laying performance and egg quality at the barn system with those at the conventional cage. A total of 288 shaver-579 brown layers were used for 9 weeks ($21^{st}$ to $30^{th}$ weeks of age) feeding study. Feed consumption and egg weight were significantly (P<0.01) higher at barn than at cage. However, there were no significant differences between two housing systems on hen day egg production (HDEP), egg mass, body weight, feed efficiency and livability. In case of egg quality parameters, shell thickness, albumen height and Haugh unit were significantly (P<0.05) different between two systems. Haugh unit and albumen height were significantly higher in eggs produced at cage (88.97 and 8.16 mm) compared than those produced at barn (83.11 and 6.87 mm), whereas shell thickness was thicker in eggs produced at barn than those produced at cage. Shape index, breaking strength, blood spots and yolk index data were not influenced significantly by the types of housing system. To implement welfare bestowing production, this study showed that the barn system can replace the conventional cage without serious sacrifices on starting phase egg production. In addition, this study suggested that the barn system need to be optimized in view of daily feed consumption.

• 한국가금학회지
• /
• 제24권2호
• /
• pp.85-90
• /
• 1997

An experiment was conducted to investigate the relationship between blood hormone levels and light cycle on performance of Korean native chicken. One hundred and two Korean native chickens were grouped into three treatments of natural light cycle (Control), 13L:11D (T2), and 16L:8D (T3). The egg production, egg weight, feed intake, serum melatonin and estrogen level were periodically measured from 22 to 34 weeks, respectively. The laying rates of T2 and T3 were significantly higher than that of the Control (P

• 한국가금학회:학술대회논문집
• /
• 한국가금학회 2003년도 제20차 정기총회 및 학술발표회
• /
• pp.99-100
• /
• 2003

육성기 제한급이가 산란생산성과 사료효율, 계란품질 및 호르몬 농도변화에 미치는 영향을 규명하고자 1일령 갈색 산란계 1,080수를 공시하여 70주령까지 사양시험을 실시하였다. 제한시기는 6주령부터 (T1)와 12주령부터(T2) 실시하였는데 18주령 이후 자유채식을 실시하였다. 산란생산성과 사료효율은 T1이 가장 개선되는 것으로 나타났으며 계란품질은 처리간 차이가 없었다. 호르몬 농도변화는 체중 및 산란 개시시기와 밀접한 관계가 있었으며, 산란시기에 따른 차이는 없었다.