• Korean Journal of Poultry Science
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• v.10 no.2
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• pp.75-81
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• 1983

The records on 787 white Leghorn hens from two different strains, A and K were wed in this study to find out the pattern of increase in egg weight with age and the optimum age of early selection for maximizing the genetic gain. The pattern of increase in egg weight with age in two lines which was expressed on graph showed that the amount of increase was larger in the early part of the laying year and it decreased gradually. Regression equations suggested that egg weight increased linearly with age at the rate of 0.46 gram per week for line A and 0.83 gram for line K. And in the regression analyses of each period mean egg weight on annual mean egg weight, the coefficients of EW 30 that is mean egg weight from 29 weeks of age to 32 weeks of age were 0.86 for line A, 0.88 for line K, and those were the highest figures among the all regression coefficients of each mean egg weight on annual mean egg weight. In estimating the relative selection efficiency of each period mean egg weight on annual mean egg weight in EW 46, selection on EW 34 for line A and on EW 30 for line K was the most efficient for improving egg weight. These results suggested that one periods from 29 weeks of age to 36 weeks of age could be used for the best predictable time for improving annual mean egg weight.

• Korean Journal of Poultry Science
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• v.10 no.2
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• pp.113-121
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• 1983

In an effort to understand epizootiological aspects of infectious laryngotracheitis (ILT), a total of 56 chicken flocks in six farms comprised of 35 broiler breeder, 13 commercial layer and 6 layer breeder flocks. were investigated. The farms experienced ILT during the period of one year from June, 1982. In most farms the birds were vaccinated against ILT just before or after the disease outbreak. In two of the farms in which ILT broke out in winter, it was possible to contain the disease in only one or two fleets without transmitting it to the remaining 5 to 7 flocks in the farms by adopting strict isolation procedures for the affected flocks. In regarding inter- flock spreading speed, it took an average of 6 days for flocks rearing on floor and 11 days for those in cages. Among the flecks in rearing cages. transmission among laying flocks was much faster. taking an average of 8 days, compared to non-laying flocks of 17 days, suggesting spreading of the disease by means of egg trays or egg collection process. Peak mortality was observed between 5 and 10 days after from the time of appearance of first dead birds from the disease and the period of mortality, with an average of 18 days, was not influenced by rearing systems, breeds and age of birds. Mortalities in the affected flocks ranged from lo/e to 19.8%, with an average of 6.5 %, and was also not influenced by the above variables except significantly lower mortality in immature broiler breeder flocks (2.9%) compared to immature layer (11.8%) and mature broiler breeder flocks (6.9%). In one breeder farm in which all the birds were kept on floor and ILT broke out in summer, mortality in male birds in all seven flocks of 37 weeks of age or older was as high as twice of that in female birds in the same flocks. This trend was not observed in one 31 weeks old flock and was reversed in another 14 weeks old flock in the farm.

• Korean Journal of Poultry Science
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• v.17 no.4
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• pp.255-268
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• 1990

This study was carried out to investigate the time-trends of genetic parameters of the dosed flock population which selected for improving egg production. Data for two layer pure lines, Line-W (Single Comb White Leghorn) and Line-B (brown layer) which have been maintained at the Mani Breeding Farm were collected from 1980 to 1985 during 5 generations. The effective number of parents per generation ranged from 148 to 366 in Line-W and 85 to 355 in Line-B, and the cumulative expected inbreeding coefficients during 5 generations of selection were 15％ and 1.6％. So inbreeding could not be considered a critical factor on estimating the genetic parameters, heritabilities and genetic correlations Heritabilities of EN 300 and EN 400, primary two selected traits were significantly decreased during 5 generations but the estimates of the other 03its not showed the consistent decreasing pattern significantly. No time trends of probable consequence were evident in the genetic correlation coefficients of the traits studied. The reason for that situation was attributed to the fact that selection was conducted for multiple objectives and the relative importance of selection for the studied traits were not consistent by generations.

• KOREAN POULTRY JOURNAL
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• v.47 no.5
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• pp.124-128
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• 2015

국내 동물약품 시장의 선두 주자인 (주)고려비엔피(대표이사 김태환)가 국내 최초로 닭 아데노바이러스 백신 개발을 마치고 곧 시판에 들어갈 예정이다. 닭아데노바이러스는 1981년 국내에 처음으로 발생된 보고이래, 1980년대 후반에는 발생보고가 없었으나 2000년대 후반기에 접어들면서 발생사례가 증가하였으며, 주로 혈청형 4형, 8형, 9형, 11형에 의해 발생하는 것으로 조사되었다. 일반적으로 아데노바이러스는 후대병아리에 수직감염되는 결과를 야기하므로 종계에서부터 수직감염 예방에 최선을 다해야 하며 산란계와 토종닭, 육계에서도 발생할 수 있으므로 그 피해를 사전에 예방해야겠다. 이번호는에는 (주)고려비엔피를 소개코자 한다.

• KOREAN POULTRY JOURNAL
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• v.34 no.8 s.394
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• pp.88-92
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• 2002

닭질병에 대한 공포가 점차 확산되고 있는 가운데 양계업은 생산기반이 무너져 내리고 있다. 종계에서 뉴캣슬병, 가금인플루엔자 피해가 커지고 있고, 산란계, 육계에서 뉴캣슬병과 가금티푸스가 가장 큰 문제로 대두되고 있지만, 정부가 펼치는 방역대책 효과에 대해서는 의구심마저 갖게 하고 있다. 각 계종별 공통된 질병에 의한 피해가 심하여 업을 포기하고 싶어도 포기하지 못하는 상태에 이르고 있다. 하지만 정부에서는 뉴캣슬병, 가금티푸스, 가금인플루엔자와 같은 질병을 차단하기 위하여 뉴캣슬병과 가금티푸스에 대한 백신정책에만 의존할 것인지, 살처분 보상 제도 도입을 계획하고 있는지 살펴보고, 양계업계에서는 앞서 지적한 닭 질병에 대한 살처분 보상제도에 대하여 어떤 의견이 있는지 점검해 보았다.

• KOREAN POULTRY JOURNAL
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• v.40 no.11
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• pp.124-127
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• 2008

한국식품연구원은 양계분야 최초로 닭고기 등급과 유해물질 잔류 등에 대한 검토를 통해 'KS 인증제'라는 등급제를 시작했다. 그 후로 시장은 각종 인증제도를 도입하였고, 올해는 농장에서도 HACCP 인증제를 시작하게 됐다. HACCP 인증제 원년인 올해, 육계농가 5(종계 포함), 산란계농가 4, 모두 9개 농가가 HACCP 인증을 받았다. 싱글벙글농장(대표 김유권)은 육계농장 중 HACCP 인증을 첫 번째로 받은 솔잎농장과 동시에 심사 신청을 했으나, 이틀에 한 번 행해지는 심사로 인해 조금 늦어져 2호 타이틀을 달게 됐다. 하지만 조금의 아쉬움도 없다고 한다. 1호니, 2호니 하는 것으로 경쟁을 할 생각이 없기 때문이다. 창간호를 맞아 이름처럼 유쾌한 '싱글벙글농장'을 다녀왔다.

• KOREAN POULTRY JOURNAL
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• v.46 no.5
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• pp.106-109
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• 2014

지난 1월 17일 전북 고창의 종오리 농가에서 HPAI가 발생해 현재('14.04.16)까지 총 34건의 의심신고가 접수 되었으며 이중 28건이 양성판정을 받았다. 4월 16일 기준(잠정집계)으로 총 494농가에서 12,729,000수가 매몰(4월 14일 기준, 원종계(육용) 16천수, 종계 548천수, 육계 3,438천수, 산란계 5,044천수)되었다. 이와관련 금번 AI 발생현황('14.04.16기준)과 농가지침사항에 대해 요약 정리 하였다.

• KOREAN POULTRY JOURNAL
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• v.46 no.4
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• pp.100-102
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• 2014

지난 1월 16일 전북 고창의 종오리 농가에서 HPAI가 발생해 현재('14.03.17)까지 총 34건의 의심신고가 접수 되었으며 이중 28건이 양성판정을 받았다. 3월 16일 기준(잠정집계)으로 총 439농장에서 10,912,000수가 매몰되었다. 이중(3월 13일 기준, 잠정집계) 육계(종계포함)는 4,059,000수, 산란계는 4,194,000수가 매몰되었지만 향수 수급에는 큰 영향이 없을 것으로 보인다. 금번 AI 발생현황과 매몰현황을 '14.03.17일 기준으로 요약 정리 하였다.

• KOREAN POULTRY JOURNAL
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• v.52 no.5
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• pp.104-107
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• 2020

종계·산란계 유정란 평사 사육공장에서 방란을 최소화하기 위한 자동난상, 슬랫을 국내 기술로 제작·판매하는 (주)동진레벨은 지난 1998년부터 22년간 양계농가에서 사용하기 용이한 제품을 보급하기 위해 달려왔다. 초기 당사에서 출시한 목재난상의 단점을 보완하고자 3여 년간의 연구·개발 끝에 2013년 '사출성형 플라스틱 조립식 자동난상'을 세계 최초로 선보였다. 국내 특허는 물론 세계 국제특허 출원 이후 아프리카 앙골라, 일본, 필리핀 등 세계 각국 수출에 성공하면서 지난해 12월 '100만불 수출의 탑'을 수상하는 영예를 안았다. 끊임없는 연구와 개발, 그리고 매년 세계 각국의 축산박람회 시찰·참관을 통해 국내 양계농가에 보다 우수한 제품을 공급하는 (주)동진레벨 김진술 대표를 찾아 양계산업 발전을 위해 노력해 온 그간의 세월을 들어보았다.

• Korean Journal of Poultry Science
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• v.48 no.2
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• pp.69-80
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• 2021

We conducted a 4 × 4 diallel cross-mating test using 934 chickens from four grandparent stock lines to develop a new synthetic breed of Korean native chicken. The mean values, combining ability, and reciprocal effects on survival rate, body weight, and hen-day egg production were analyzed. In phenotypes, most chickens have yellowish-brown, reddish-brown and mixed color feathers. The average survival rate was 86.8±12.3%, with the highest in YH combination. Specific combining ability (SCA) had a greater effect on survival rate than general combining ability (GCA), and the SCA of HY combination was the highest. The 16 cross-combinations were distinctly divided into three weight groups according to their genetic characteristics. At 12 weeks of age, GCA showed a greater effect on weight than SCA, and the SCA of FH combination was the highest. The age at first egg laying was 157 days, and the crosses reached sexual maturity faster than the pure lines. The egg production rate was highest in SY at 79.5±2.1%. The GCA and SCA for hen-day egg production were similar, and the SCA was highest in the HS and FY combinations. The reciprocal effect showed that the offspring's egg production rate was high when S and Y were maternal parents in almost all combinations. In conclusion, FH and HF combinations, which have excellent growth performance, are the most desirable paternal parent stock strains, and FY, FS, HY, and SY combinations, which have excellent laying performance with moderate weight, are the preferred maternal strains.