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토끼에 있어서 번식능력에 영향을 미치는 품종및 환경요인에 관한 연구
이학교(H . K . Lee),류충현(C . H . Ryu),최진성(J . S . Choi),강만석(M . S. Kang) 한국축산학회 1988 한국축산학회지 Vol.30 No.12
This study was conducted to estimate the effect of breed. year of kindling, season of kindling and month of age at kindling on the reproductivity in does. The data used in this study were obtained from total 4,024 litters of New zealand white (2,302 litters) and Californian (1,722 litters) raised at the Animal Breeding Institute from 1978 to 1986. The results obtained are summarized as follows: l. Significant (P$lt;0.05) differences were detected for born number, litter size at 21-day and at weaning among the breeds, kindling seasons and years, respectively. Except for growth rate from birth to 21 days of age, linear regression for month of age at kindling affected litter size and growth rate significantly (P$lt;0.01). 2. Breeds affected kitling weight at 21-day and at weaning significantly (P$lt;0.01). Years and seasons affected litter weight at 21-day and at weaning significantly (P$lt;0.01). 3. Breeds affected gestation length significantly (P$lt;0.01). The gestation length least-square means were 31.2±0. 18 and 31.8±0.27 in New zealand, Californian breed, respectively. Breed and season affected within-litter uniformity significantly (P$lt;0.01). Least-square means of within-litter uniformity over all litters studied was 12.0+1.12%.
이학교(H . K . Lee),류충현(C . H . Yoo),최진성(J . S . Choi),박태진(T . J . Park) 한국축산학회 1991 한국축산학회지 Vol.33 No.1
This study was conducted to investigate the effects of inbreeding of dam, age of dam and kindling seasons on various reproductive traits of rabbits. The data used in this study were the records of 1,698 heads tested from 1978 to 1986 at National Animal Breeding Institute. Litter size and litter weight were significantly differed from years, kindling seasons and age of dam. Inbreeding of dam significantly affected all reproductive traits with the exception of litter size at 2l days and litter weight at 2l days. Regression coefficients of inbreeding coefficient of dam on litter size at birth, 2l days and 56days were -0.031±0.012, -0.027±0.014 and -0.048±0.012, respectively. Those of inbreeding coefficient of dam were -4.371±2.018 (litter weight at 2l days), -69.32±23.51 (litter weight at 56days), 0.181±0.081(litter-uniformity) and 0.048±0.012 (gestation length), respectively.
돼지에 있어서 이유전 형질과 이유후 형질에 대한 유전모수 추정
이학교,최진성,김인철,박종대,강만석 ( H . K . Lee,J . S . Choi,I . C . Kim,J . D . Park,M . S . Kang ) 한국축산학회 1989 한국축산학회지 Vol.31 No.4
This study involved the records of 389 heads of Duroc, Hampshire, Large Yorkshire and Landrace boars tested at National Breeding Institute from 1980 to 1987. The Purpose of this analysis was to investigate the relationship between preweaning traits and postweaning traits. Preweaning and postweaning traits studied were; the number of live pigs in the litter in which the boar was born(LSBNA) and weaned(LSWN); his birth weight (BW), weight at 21days of age(GW21D), Weaning weight(WW56D); average daily gain(ADG), backfat thickness (BFT), feed Requirement(F/R), the days to 90㎏(90DAYS), IOWA-INDEX(INDEX). The heritabilities and genetic and phenotypic correlations were estimated from the sire components of variance and covariance. 1. Heritabilities estimated were 0.521±0.188(ADG), 0.219±0.169(F/E), 0.459±0.181(BFT), 0.91±0.215(90 DAYS), 0.337±0.173(INDEX), 0.371±0.312(LSBNA), 0.261± 0.191(LSWN), 0.174±0.153(BW), 0.208±0.157(GW21D) and 0.268±0.163(WW56D), respectively. 2. Genetic correlation of performance index (INDEX) with (BW), (GW21D), and (WW56D) were 0.326, 0.460 and 0.169, respectively, Phenotypic correlation of (INDEX) with (BW), (GW21D) and (WW56D) were 0.145, 0.065 and 0.076, respectively. Genetically (BW), (GW21D) and (WW56D) of the preweaning traits tended to show positive relationship with postweaning traits. These result indicated that the better growth rate at early stage tended to have a better performance.
토끼에 있어서 번식형질 (繁植形質) 에 대한 유전적 모수 추정
이학교(H . K . Lee),류충현(C . H . Ryu),최진성(J . S . Choi),박태진(T . J . Park) 한국축산학회 1991 한국축산학회지 Vol.33 No.7
This study was conducted to estimate genetic parameters on the reproductive traits in does. The data used in this study were obtained from total 3.939 litters of New zealand White and Californian tested from 1978 to 1986 at National Animal Breeding Institute. The results obtained are summarized as follows ; 1. On New zealand White and Californian breed. general performance were 7.63±0.03 and 7.31±0.04 for litter size at birth, 6.93±0.03 and 6.78±0.14 for litter size at 21 days, 2.05±0.01 ㎏ and 2.04±0.01 ㎏ for litter weight at 21 days, and 90.13±0.33% and 92.15±0.39% for survival to 21 days, respectively. 2. Estimates of heritabilities were 0.13±0.021 for litter size, 0.084±0.018 for litter weight at 21 day, 0.121±0.018 for kitling weight at 21 days, 0.040±0.013 for survival to 21 days and 0.079±0.015 for gestation length. 3. Genetic (phenotypic) correlations of litter size at birth with litter weight at 21 days and survival to 21 days were 0.353(0.279) and -0.572(-0.496) and those of litter weight at 21 days with kitling weight at 21 day and survival to 21 days were 0.213(0.332) and 0.319(0.238) and those of kitling weight at 21 days with within-litter uniformity and survival to 21 days were 0.525(0.068) and 0.721(0.128).
유우의 산유량과 번식능력에 대한 유전적 모수추정에 관한 연구
이학교(H . K . Lee),신영수(Y . S . Sin),조윤연(Y . Y . Cho),오봉국(B . K . Ohh) 한국축산학회 1988 한국축산학회지 Vol.30 No.11
This study was carried out to estimate heritabilities, phenotypic and genetic correlations among various economic traits. Data used in this study included a total of 783 lactation records of Holstein cows (First 419, Second parity 364) which were raised in the National Animal Breeding Institute from 1970 to 1985. 1. In the average performance of each trait; total milk yield was 4486 ± 1182 ㎏, 305 D milk yield 5178 ± 1145 ㎏, Annualized milk yield 3860 ± 1000 ㎏, services per conception 1.95 ± 1.27, day open 119.9 ± 58.5 day in first parity, and total milk yield was 4866 ± 1183 ㎏, 305 D milk yield 5427 ± 1085, annualized milk yield 4237 ± 1089 ㎏, services per conception 2.04 ± 1.50, day open 119.1 ± 71.2 day in second parity. There was significance of 5% level between first parity milk yield and second parity milk yield. 2. The heritabilities estimated from sire component were 0.11, 0.28, for the total milk yield, 0.29 and 0.19 for the 305 day corrected milk yield, 0.12 and 0.10, for the annualized milk yield for each lactation set. Estimates of heritability were 0.05 and 0.08 for the services per conception, 0.07 and 0.03 for the day open, respectively. 3. In the each lactation set, genetic and phenotypic correlations of services per conception with 305 D milk yield were 0.31, 0.08 and 0.03, -0.01, with total mild yield 0.06, 0.52 and 0.49, 0.47, with annualized milk yield 0.15, -0.41 and 0.09, -0.41. The genetic correlations of day open with total milk yield were 0.06 and 0.47, day open with 305 D milk yield 0.16 and 0.08, day open with annualized milk yield 0.20 and 0.01 for each lactation set`, respectively. Phenotypic correlations of day open were measured to be 0.52 and 0.47 with total yield, 0.50 and 0.47 with 305 D milk yield, -0.71 and -0.52 with annualized milk yield for each lactation set.
돼지의 복당산자수와 (腹當産仔數) 생존율에 영향을 미치는 환경효과 및 산차간의 상관관계 추정
이학교,김인철 ( H . K . Lee,I . C . Kim ) 한국축산학회 1989 한국축산학회지 Vol.31 No.10
Environmental effects on litter size and survival rate and correlation coefficients of the traits between parity sets were estimated on the basis of the data from 1,815 litters of Landrace, Large Yorkshire, Duroc and Hampshire raised at National Animal Breeding Institute from 1980 to 1988. Significant effects of breed on total number born were detected in the 1st, 2nd and 3rd parity sets(p $lt;0.01), while the farrowing season showed a significant effect in the 1st parity set only. The litter size at 21 days of age and weaning were effected on the farrowing season and the breed(p $lt;0.01), and sows farrowed in spring showed better performance for those of traits. The farrowing season showed clear effect on survival rate up to 21 days of age. Survival percentages up to 21 days of age in spring, summer, fall, and winter were: 36.04, 92.49, 96.21, and 93.41% in 1st parity set, 94.78, 91.41, 92.20, and 91.50% in 2nd parity set, 93.36, 91.90, 95.17, and 94.79% in 3rd parity set, respectively. Correlation coefficients of the traits between parity sets were 0.21 for total number born, 0.19 for litter size at 21 days of age, and 0.24 for litter size at weaning between the 2nd and 3rd parity set.
한국 오골계의 유전 특성 분석을 위한 임의 염기 서열의 Short Oligonucleotide Primer 를 이용한 Polymerase Chain Reaction 기법의 적용
황규춘,홍영호,이학교,손시환,조병욱,한재용 ( K . C . Hwang,Y . H . Hong,H . K . Lee,S . H . Sohn,B . W . Cho,J . Y . Han ) 한국축산학회 1997 한국축산학회지 Vol.39 No.1
This study was carried out to establish the optimal RAPD condition using, short oligonucleotide primers and then to compare the genetic characteristics of Korean Native Ogol Chicken with other breed of chicken, including WL, RIR, CN and KNBC. Each 5 individuals per breed were bled and DNA was extracted from collected blood. The primers used in this study were composed of 10 oligonucleotides of 50∼80% G+C content. The optimization on the primer annealing temperature, concentration of Mg ion, amount of template DNA was conducted. From initial 400 primers, 50 polymorphic primers between individuals of same or different breeds were selected. And finally, 10 primers showing highly polymorphic and reproducible pattern were selected and 49 polymorphic markers were counted for Band Sharing Coefficient estimation. Both KNOC and KNBC showed a high genetic homogeneity (0.862, 0.858) and RIR showed most homogeneous genetic composition {0.891). In the case of interbreed comparisons, both KNOC and KNBC showed the highest genetic similarity with CN (0.810, 0.835) and the least with WL (0.772, 0.782) than any other breeds. Therefore, the RAPD technique using short oligonucleotide sequences was useful for genetic analysis in chicken