Prediction of Retail Beef Yield Using Parameters Based on Korean Beef Carcass Grading Standards

최연호,이선호,최성복,전기준,김형철,정학재,이종문,박범영 한국축산식품학회 2010 한국축산식품학회지 Vol.30 No.6

Two sets of data on carcass traits and beef cut parameters were used to investigate the relationships between carcass and beef cut measurements, which can be used to make predictions of retail cut percentages. One set had a total of 1,141 measurements of Hanwoo cattle of three different sex origins, which were slaughtered in an abattoir located at the National Institute of Animal Science, RDA, Korea from 1996 to 2008. To develop prediction models for retail cut percentage with higher accuracies than the current model, another set consisting of a total of 13,389 records of carcass and beef cut traits were collected from 30 abattoirs and butcheries in Korea from 2008 to 2009. Bulls yielded heavier and leaner carcasses than steers. High correlation coefficients were estimated between amount of body fat and percent retail cut (-0.82) as well as between back fat thickness (BF)and percent retail cut (-0.62). The amount of retail cut, however, was highly correlated with body weight before slaughter (BW,0.95) or with cold carcass weight (CWT, 0.94). Relationships between percent retail cut and measurable beef yield traits, BF,loin eye area (LEA) or CWT varied by sex class, which must be considered for development of a prediction model with high accuracy. Models of data for all breeds and sexes fit the effects of breed, sex, and interaction of abattoir by butchers, whereas models of data for each breed and sex fit the effect of interaction of abattoir by butcher only. Due to possible future changes in back fat control, we performed a log transformation of BF. Our new models fit better than the currently used model.

국내외 유통 젖소 씨수소 유전능력을 맞비교한다. - 인터불 국제 유전능력 평가결과에 수정 KTPI 지수를 적용 -

최연호,이경태,당창권,이석현,김시동,박병호,최유림,최재관,박미나,이승수,장혁기,Alam Mahboob,강하연,강연희,류은아 한국동물생명공학회(구 한국동물번식학회) 2018 발생공학 국제심포지엄 및 학술대회 Vol.2018 No.06

우리나라에서 정액을 수입하는 미국이나 캐나다의 씨수소와 국내산 씨수소들 간에 비 교가 불가능하였다. 그러나 우리나라에서 2011년부터 참여하고 있는 국제 유전능력 평가 (인터불, interbull) 결과(EBV, PTA)를 활용하고 국내 씨수소 선발에 사용하는 KTPI 등의 선발지수를 수정하면 인터불 평가에 참여하는 모든 국가에서 생산한 씨수소들의 유전능 력 상호비교가 가능하다. 따라서 본 연구에서는 기존의 KTPI 선발지수를 변형한 새로운 KTPI 선발지수를 소개하고 기존의 지수들과의 상관관계를 분석하여 순위 변화 여부를 확 인하였다. 기존의 KTPI에 포함된 유지방량, 유단백량, 체형종합점수 외에 유방지수(UDC) 와 지제지수(FLC)에서 중간 최적 형질의 육종가 값을 변형하여 원 형질값 1~9점에서 5 점이 가장 높은 실숫값을 가지도록 절댓값 함수로 변환하고, 인터불 평가에 포함되지 않 는 뒷유방너비(유방지수 구성 형질) 심사 형질을 제외한 후 구성 형질값들의 상대적 가중 치를 비율적으로 조정하여 새로운 KTPI 지수를 구성하였다. 결과, 지제지수(FLC)는 중간 최적 형질 변환 전후 상관계수가 0.95였다. 유방지수(UDC)의 경우, 중간최적형질을 변환 전후 상관계수는 0.94였으며, 변환과 더불어 뒷유방너비를 제외한 전후 상관계수는 0.93 이었다. 그러나 KTPI로 종합한 지수에서는 중간최적형질 변환과 뒷유방너비 제외와 무관 하게 전후 상관계수가 1.00이었다. 결론적으로 전체적인 종합지수은 수정에 따른 변화가 거의 없었으나, 유방지수와 지제지수에 대해서는 중간최적형질에 대한 변환으로 인해 보 다 바람직한 선발 기준으로 이용할 수 있다.

산란계 농장관리 소프트웨어 활용(2)

최연호 대한양계협회 1997 월간 양계 Vol.29 No.3

홀스타인 젖소의 생시체중과 분만난이도와의 상관관계

최연호,원정일,윤호백,조광현,Alam Mahboob,조충일,연성흠,박병호,양보석 강원대학교 동물생명과학연구소(구 강원대학교 동물자원공동연구소) 2015 동물자원연구 Vol.26 No.2

The objective of this study was to identify the phenotypic relationships among calving difficulty, calf birth weight and gestation length of Holstein dairy cattle under the environment of Korea. A total of 1,834 calving records collected by Dairy Science Division of National Institute of Animal Science, RDA from 2000 to 2014 was analyzed. General linear multivariate models for calving difficulty scores (CD: 1=no assistance, 2=minor assistance, 3=two to three persons assisted, 4=more than three persons assisted, 5=cesarean section), calf body weight at birth (BW), and gestation length (GL) included fixed effects of year and season (spring, summer, autumn, winter) of births (YS), sex of calves, and parity. For GL and BW, all three fixed effects (YS, sex of calves, parity) were significant (p<0.05). For CD, the effects of YS and sex of calves were significant (p<0.05). Bull calves were born with heavier BW by 3.18 kg, with greater CD by 0.18 point and with longer GL by 0.6 days than heifer calves. The least squares mean of BW was the heaviest at the third parity (44.1 kg) compared to those at the first, the second and the fourth parities or later (41.3-41.9 kg). The least squares mean CD at the first parity was 1.74 point, which was higher than CD at the second and later parities (about 1.68 points). Phenotypic correlation (partial residual correlation) between GL and BW was 0.36. But those between GL and CD and between BW and CD were -0.03 and 0.04, almost zeros. To conclude, we observed higher incidence of calving difficulty in the first calving than in the later ones. Further investigation on the relationships between calf’s birth weight and calving difficulty is needed.

소의 효율적 관리를 위한 살찐 점수의 이용

최연호 한국낙농육우협회 1999 낙농·육우 Vol.19 No.4

학동기 전 정상 아동의 Helicobacter pylori 감염률에 대한 연구

최연호,김의종,서정기,Choe, Yon-Ho,Kim, Eui-Chong,Seo, Jeong-Kee 대한소아소화기영양학회 1999 Pediatric gastroenterology, hepatology & nutrition Vol.2 No.2

목 적: H. pylori 감염률은 생활수준과 밀접한 관계가 있어 경제적으로 어려울수록 감염률이 높아지며 사회생활을 하면서 나이가 증가함에 따라 같이 올라간다. 소아에 있어서 선진국에서는 5% 미만의 감염률을 보이고 있고 우리나라에서는 6세에서 15세까지의 정상아동에 16.5%의 감염률이 보고된 바 있다. 부모연령의 감염률이 높은 우리나라에서 5세 이하 정상아동에서의 H. pylori 감염률은 혈액채취 등의 어려움으로 현재까지 거의 조사되어 있지 않아 H. pylori 특이 IgG 항체검사를 이용, H. pylori의 감염률을 알아보고자 하였다. 방 법: 1995년 서울시내 3곳의 어린이집을 방문하여 2세에서 5세까지의 220명(2세 24명, 3세 54명, 4세 95명, 5세 47명)에 대하여 혈액을 채취하고 ELISA를 이용한 IgG GAP test로 H. pylori의 감염률을 조사하였다. 결 과: 1) 총 220명중 양성은 2세 1명, 3세 2명, 4세 1명, 5세 1명의 총 5명으로 양성률은 2.3%였다. 2) 약양성(equivocally probable positive)은 2세 3명, 3세 3명, 4세 4명, 5세 3명의 총 13명으로 220명중 5.9%였다. 결 론: 우리나라 2세에서 5세까지의 정상아동에 있어서 H. pylori의 감염률은 2.3~8.2%로 생각되어지며 선진국에 비교하면 아직도 높은 수치로 향후 가족내 감염 등 집단감염과 사회경제적 환경의 변화에 따른 감염률의 추이에 대해 지속적인 연구가 필요할 것으로 본다. Purpose: The aim of this study was to evaluate the prevalence of H. pylori infection in normal preschool children. Methods: Study population consisted of 220 preschool children aged 2 to 5 years in Seoul, Korea. We measured H. pylori specific IgG antibody using the GAP test IgG kit, and samples with concentrations greater than 20 U/ml were considered positive. Results: Of the 220 children, 5 (2.3%) were positive, and thirteen (5.9%) of 220 were equivocally probable positive. Conclusion: The positive rate of H. pylori infection detected by specific IgG antibody in normal preschool children aged 2 to 5 years was approximately 2.3% to 8.2%. This prevalence rate is still high, compared to that of the West. A better knowledge of the transmission of H. pylori is crucial to formulate recommendations for lowering the rate.

우량종계 육종을 위한 컴퓨터 소프트웨어 시스템 개발에 관한 연구

최연호,조상문,장종준 한국가금학회 1995 韓國家禽學會誌 Vol.22 No.1

This study was carried out to develop a computer software system for poultry breeding by using microcomputer(PC). Through this study, SPPB(Statistical Package for Poultry Breeding) was designed and developed, which can help poultry breeder collect and analyse the chick records. A main feature of the system was the application of user-oriented procedure, for example, choice of the flock file, selection of the family size and the desired traits. Creation of the data files and the breeding files. calculation of the elementary statistics, estimation of the heritability and the genetic and phenotypic correlation coefficients can be obtained by user's choice of the sire and dam family size. Also, it is possible to estimate the various selection indices through this system. Easiness of using this system and the flexibility of the file management could help increasing the efficiency of related practical poultry breeding jobs. Correctness and relationships between the unit programs in the system were proved through the run-test of the SPPB using sample data. Because it wasn't able to collect breeding records at the commercial breeding farm, effectiveness of the system was not proved totally. Also. it will be necessary to develop the integrated software system which make possible to computerize the general works at breeding farm and the genetic analyses of the records from chick breeders.

정보화 사회의 양계산업

최연호 대한양계협회 2001 월간 양계 Vol.33 No.4

생체모방 공중로봇의 날개 구조 모델링

최연호,조내수,정정은,권우현,이동하,Choi, Youn-Ho,Cho, Nae-Soo,Joung, Jung-Eun,Kwon, Woo-Hyen,Lee, Dong-Ha 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.suppl3

The research of the biological mimics robot which utilizes the operation of the organism is progressed on the ground, aerial, and underwater robot sector. In the field of flying robot, the research for implementing the wing movement structure of the bird and insect is progressed. The joint structure for the wing movement of the bird is implemented. The operation of the wing is simulated. For this purpose, by using the Matlab/Simulink, the joint structure of the wing is modelled. The joint movement of the wing is tested through the simulation.

산란계 농장관리 전산화 프로그램(IV)

최연호 대한양계협회 2002 월간 양계 Vol.34 No.1