난용계의 주요경제형질에 대한 상가적 ( 相加的 ) 및 모체유전효과의 상관계수 추정

여정수,오봉국 ( Jung Sou Yeo,Bong Kug Ohh ) 한국축산학회 1983 한국축산학회지 Vol.25 No.4

Data from the 2718 birds of two Leghorn populations for three generations were analyzed to determine the genetic correlations between direct effects(γXoYo), maternal genetic effects (γXmYm) and direct-maternal genetic effects (γXoYm, γXmYo) for X and Y traits. It was found that in A line egg production will be improved according to light initial body weight, increase of egg weight highly correlated with body weight will be higher than the expected estimates on the basis of γXoYo, and egg production improvement after 43 weeks of age will derive the decrease of egg weight in the causes of negative γXmYo between egg number and egg weight. In D line, highly negative coefficient in yXmYo between body weight and egg number, body weight and egg weight, and egg number and egg weight will provide increase of egg number from lighten body weight, while correlated response between egg weight and body weight will be biased below the expected estimates and also decrease of egg weight dependent on increased egg number will be less than the expected estimates.

초산시 체중이 주요경제 형질에 미치는 영향

여정수,오봉국 ( Jung Sou Yeo,Bong Kug Ohh ) 한국축산학회 1978 한국축산학회지 Vol.20 No.3

This experiment was conducted to investigate the optimum body size at 18 weeks of age which would relate to other economic characters in layer. Data of first egg day, egg production, egg weight, body weight, feed efficiency, and adult mortality were collected at Poultry Breeding Farm, College of Agriculture, Seoul National University from March 25, 1976 to 7une 2, 1977. The results obtained were as follows: 1. The first egg day was significantly correlated with body weight at sexual maturity. Heavy body weight groups showed relatively earlier in first egg days than low body weight groups. 2. Egg production didn`t show close relation to body weight but there was a tendency that the relatively lighter body weight groups laid more eggs than higher groups. In this strain, optimum body weight at sexual maturity for egg production seemed to range from 1,275g to 1,425g. 3. In egg weight of this strain there was evidently critical point between heavy and light group at 1,425g in body weight at sexual maturity. Egg production, growth rate and sexual maturity were suggested as a second factors to influence egg weight. 4. Body weight at 18 weeks of age was highly correlated with body weight during laying period. 5. Feed requirement per ㎏ eggs produced showed highly positive correlation with initial body weight. Birds weighing from 1,275g to 1,325g at sexual maturity seemed to bring the best feed efficiency. 6. During laying period viability of the lightest group weighing below 1,275g at 18 weeks of age was observed relatively low, but geneal tendency between body weight and viability was throught to be flexible.

난용계에 (卵用鷄) 있어서 상가적 (相加的) 및 모체유전 효과를 이용한 선발지수 추정

여정수(Jung Sou Yeo),오봉국(Bong Kug Ohh) 한국축산학회 1984 한국축산학회지 Vol.26 No.1

The data from the record of 1131 birds of synthetic population (A line) and 1587 birds of selected population (D line) through 3 generations (1977-1980) were used for the estimates of expected genetic gain by selection indices based on the additive effect only and maternal and additive effects. It was found through Hazel`s method considered the only additive effect that in both lines the first egg day and egg weight at 43 weeks of age were decreased while egg number to 43 weeks of age was increased, and body weight at 43 weeks of age was slightly decreased. And A line showed more satisfactory genetic changes compared with D line except body weight. Expected genetic gains in A line based on genetic parameters estimated using additive and maternal genetic effects simultaneously were the most significant for increase of egg number among the four traits studied and egg weight was 2.50g heavier than performance of this generation, while body weight and the first egg day were decreased, which were considered most desirable in genetic changes of layer. In line D genetic gain of egg production could be achieved through maternal genetic effect with maintaining body weight nearly constant. And major profitable egg weight was decreased by 0.87g lower than that of this generation, and the first egg day was also shortened. According to above results genetic improvement using the additive and maternal effects may be achieved more desirable than that using the additive effect only.

한국 재래축종인 (在來畜種) 한우의 염색체 분석

여정수 ( Jung Sou Yeo ) 한국축산학회 1984 한국축산학회지 Vol.26 No.3

For the purpose of the distinguishing the sophisticated chromosome spread procedure and chromosome banding pattern of the Korean Native Cattle, fifty heads were examined cytogenetically using the bone marrow culture technique. Red bone marrow from femur and sternum was mixed with one drop of 1% colchicine in 20 gage needle and 7-10 cc media, and then cultured for 2-3 hours at 37.5C. After hypotonic treatment by 1% sodium citrate for 30 minutes at 37.5C, it was fixed in 3:1 methanol acetic acid. The slides chromosome were prepared and air- dried. Metaphase plate of chromosome was found at slide treated by the Giemsa staining. Chromosome number of the Korean Native Cattle was 60 at haploid, as telocentric autosome and sex chromosome X and Y were sub-metacentric. To be clearly identify the homology chromosome and banding pattern in each chromosome complement, prepared chromosome slides were treated with 0.03-0.04% trypsin solution (with Hank`s BSS free Ca and Mg) at 25℃ for 10 minutes, and then rinsed 70% and 100% ethanol. In comparison standardised banding pattern of the Korean Native Cattle with the other cattle breeds, it was found that 7 pairs of autosome in the Korean Native Cattle; 6, 7, 16 19, 24, 25 and 27 were not matched with other domestic cattle.

한우의 염색체 분염분석에 의한 유전적 조성의 특징에 관한 연구

여정수 ( Jung Sou Yeo ) 한국축산학회 1987 한국축산학회지 Vol.29 No.3

Chromosome analysis with the DNA structure is the new approach to identify the characteristics of genetic materials in the Korean Native Cattle. Chromosome number and morphology of the Korean Native Cattle were same as the aspects of other beef breeds reported already. G-banded chromosome pattern measured by densitometric measurement was similar to other reports for number and location of bands, but density of band was quite different. C-banding pattern, heterochromatic region, was estimated by the photo-electric recording and ratio of the band size per total chromosome. Dark bands were located at centromere of all chromosomes and especially banded regions of chromosome # 4, 19, 26, X and Y were above 40% of total size. Density of G-band and size of C-band in the Korean Native Cattle were considered the important tools in order to check the genetic marker related to performance.

한국 재래산양의 염색체 분석

여정수 ( Jung Sou Yeo ) 한국축산학회 1984 한국축산학회지 Vol.26 No.3

According to the sophisticated chromosome spread procedure of Yeo (1984), chromosome analysis of the Korean Native Goat was identified as follows; Chromosome number was 60 at haploid, 29 pairs autosome appeared as telocentric identical to the Korean Native Cattle. And sex chromosome X was acrocentric and Y was found as the smallest metacentric. In banding pattern of the each chromosome complement to classify the homology chromosome, each chromosome pair of the Korean Native Goat was found a considerable degree similarity with banding pattern of the Korean Native Cattle. Three pairs of autosome in the Korean Native Goat; 17, 19, 27 were not quitely corresponded to other domestic goat in comparison standardized banding pattern of the Korean Native Goat with other goat breeds.

G - , C - banding 에 의한 닭의 염색체 분석

여정수 ( Jung Sou Yeo ) 한국축산학회 1985 한국축산학회지 Vol.27 No.12

Precise analysis of chromosomal genetic materials is not only important at cytogenetics field but basic steps of molecular genetics. To approach these aims through this study, G- and C- banding techniques were used. G- banding was found more accurate patterns at macro-chromosomes compared with recent reported banding patterns. While C- banding was gotten precise heterochromatin site of all chromosomes. So genetic markers dependent on economic traits of chicken will be identified based on advanced banding techniques.

닭(gallus domesticus)의 經濟形質 改良을 위한 染色體 分染分析과 標識因子의 究明에 관한 硏究 Ⅱ. 卵用種의 系統間의 比較

Jung Sou Yeo(呂政秀),Bong Kug Ohh(吳鳳國),Bong Bo Seo(徐奉甫) 한국육종학회 1985 한국육종학회지 Vol.17 No.1

This experiment was carried out to identify the differences of genetic materials as genetic marker for the four strains of egg type breed. The differences of strains of egg type chick were as follows. It was chracterized with strain A to show less band at distal part of chromosome #3 and dark band at centromere of #4-q. More bands at distal part of #1-q than others was the marker of strain K. In strain M, less band at #2-p and non-band at distal part of #Z-q were observed, and dark band at centromere of Z chromosome like the feature of meat type chick was the chracteristics of strain S.

산란계의 교잡육종에 관한 연구

오봉국,여정수 ( Bong Kug Ohh,Jung Sou Yeo ) 한국축산학회 1979 한국축산학회지 Vol.21 No.4

This experiment carried out to identify combining ability and genetic sources of 5 purebreds A, B, C, K, N strains through crosses among them. Those data were collected during 45 weeks from 19th, May 1977 to 30th, March 1978 at Poultry Breeding Farm, College of Agriculture, Seoul National University, and experimental stocks used were 1,345 purebreds and 519crossbreds. Theres was evidence to indicate that for all characters except viability these data could investigate the crosses to be better than the parents from which they were derived. Phenotypic performances of AK, BK, CK strains which were derived from K-male, and AK, AN strains from A-female could be measured as superior general combining ability of A and K strains in egg production. Sexual maturity day of BK crossbred shortened 12 days compared with mean performance of it`s parent. This considerable result proposed satisfactory specific combining ability of B to K strain. AN and BN crossbreds which were produced from N line, genetically small egg lager, laved smaller egg than others. In body weight, crossbreds of N-male were observed as h yaw birds which might require more feed for body maintenance. As these results utilization of N strain in breeding of layer seemed to be negligible source. Reciprocal cross of C and K strain seemed to show the sex-linkage effect of K strain in egg production and maternal effect of C strain in egg weight. In general, additive effects were the most important for egg weight and body weight but nonadditive effects for egg production. Using the above identifications which were satisfactory general combining ability of A and K strains, and specific combining ability of B strain to K strain, continuos genetic improvement of non-additive effect by crosses of those strains can be expected to be considerable achievements.

한우 암소의 생체 초음파 성적을 이용한 유전모수 추정

이지홍,여정수,Lee, Ji-Hong,Yeo, Jung-Sou 한국데이터정보과학회 2011 한국데이터정보과학회지 Vol.22 No.6

지금까지 한우의 유전능력 개량은 수소 위주로 이루어져 왔으나, 최근 암 수소 동시개량을 위하여 많은 연구가 진행 중에 있다. 본 연구에서는 암소의 유전능력 개량을 위하여 생체 초음파 단층 촬영기법을 이용하여, 주요 경제형질에 대한 유전적 효과를 측정하였다. 한우 암소 1,648두의 생체 초음파 단층촬영 결과를 이용하여 측정시 암소의 사육월령, 측정지역, 신체충실지수의 효과를 일반 선형모형을 이용하여 조사하였다. 한우 암소의 초음파 측정시 사육월령별 초음파 성적은 50~60개월령의 등심단면적, 등지방두께, 근내지방도 성적에서 유의적으로 높게 나타나 이 시기가 암소의 발육이 가장 높은 시기로 판단된다 (P<0.05). 그리고 지역별 암소의 초음파 성적은 C 지역이 신체충실지수, 등심단면적, 등지방두께가 높게 나타났으며, J지역은 근내지방도가 가장 낮게 나타났다 (P<0.05). 신체충실지수가 높을수록 등심단면적, 등지방두께, 근내지방도 성적이 높게 나타났다. 제한최대우도법으로 유전모수를 추정한 결과 유전력은 등심단면적이 0.136, 등지방두께가 0.351, 근내지방도가 0.236으로 나타났다. 이러한 초음파를 이용한 유전모수 추정결과는 수소 거세우의 도체성적을 이용한 유전모수 추정결과에 비하여 낮게 나타났지만, 도축을 하지 않은 암소의 유전능력 개량을 위해서는 반드시 필요한 기초자료라 판단된다. This study was conducted to estimate genetic effects on economically important traits for genetic improvement in Hanwoo by using the real-time ultrasound measurements for longissimus dorsi muscle area (LMA), backfat thickness (BFT), and marbling score (Marb). The phenotypic data were obtained from 1,648 pedigreed cows, and general linear models were applied to test the effects of age, region, and body condition socre. The cows between 50 and 60 months of age had the greatest scores for LMA and BFT, and Marb (P<0.05). The cows in region C had the greatest scores for body condition socre, LMA and BFT, while in region J Marb was the lowest (P<0.05). There was positive relation with LMA, BFT, and Marb according to increase body condition socre. Heritabilities for LMA, BFT, and Marb were estimated as 0.136, 0.351, and 0.236, respectively. These results would provide primary information for the efficient implementation of genetic improvement schemes in Hanwoo.