염색체분염법 ( G- banding ) 에 의한 돼지의 품종별 유전적 표지인자 구명에 관한 연구

김철욱(C . W . Kim),손시환(S . H . Sohn) 한국축산학회 1995 한국축산학회지 Vol.37 No.1

To identity genetic martcers of several swine breeds, the G-banding patterns were analyzed. The peripheral blood cells which were collected from the jugular vein were cultured and G-banding patterns were analyzed from 50 Yorkshire, 50 Landrace, and 50 Duroc individuals. Swine chromosomes consist of metacentric, submetacentric, and acrocentric chromosomes. The number of swine chromosomes are 38(2n). According to the G-banding analysis, most of chromosomes had a distinct and regular band pattern. The total number of G-bands in swine was about 250 bands, of which 110 bands were dark hands. Several specific G-band patterns were found among breeds. In Landrace, chromosome I had a distinctive proximal dark band on the p-ann and chromosome 13 to chromosome 18 also had manifest dark bands at the centromere position. On the other hand, Yorkshire and Duroc had irregular banding patterns at these sites. In addition, the G-bands of the nucleolar organizer region (NOR) which was located at centromere of chromosome 10 showed different patterns among breeds. Landrace and Duroc had a broad Gght band in this position. However, Yorkshire had a narrow light band. The specific banding pattern was consistent and characteristic among all presented breeds. Therefore we present these specific G-band patterns as chromosomal markers for several swine breeds.

교배조합과 산차 및 이유일령이 모돈의 상태 및 번식형질에 미치는 영향

김철욱(C . W . Kim),진상근(S . K . Jin),김두환(D . H . Kim) 한국축산학회 1995 한국축산학회지 Vol.37 No.5

This expemment was carried out to investigate the effect of mating type(LY×D, LY×L. LY×Y and LY×DH), parity(1st and over 2nd) and weaning age(32 days and 28 days) on reproductive traits for litter size, pig and litter weight at birth and at weaning. The 155 piglets were produced from mating systems breeding Landrace×Yorkshire sows to Duroc boars. Landrace×Yorkshire sows to Landrace boars, Landrace×Yorkshire sows to Yorkshire boars and Landrace×Yorkshire sows to Duroc×Hampshire boars. The effects of parity and weaning age were also studied on the sow`s body condition for changes in backfat thickness and sow`s weight during the lactating periods arrd days to rebreeding of 16 sows produced by crossbreeding Landrace sows to Yorkshire boar. For the body conditions of sows during lactating periods, it was not significantly different by parity and weaning age. but average thickness of backfat was reduced by 4mm and average body weight loss was about 26㎏. Days to rebreeding of sows was about 6 days. For the litter size at birth and weaning, it was to be the highest at 1 I piglets in the LY×L, but the lent at 8 piglets in the LY×DH among the mating types. Pig weight at birth was the highest at 1.64㎏ in the first parity of LY×DH mating type and was the lightest at 1.25㎏ in the first parity of LY×D mating type. Pig weight at weaning was the highest at 9.65㎏ in the second parity of the LY×Y mating type and was the lightest as 5.1㎏ in the first parity of the LY×D mating type.

유전 및 환경적 요인에 따른 세포유전학적 연구 1 . 계통별 염색체 이상

김철욱(C . W . Kim),손진기(J . K . Son),(N . S . Fachheimer) 한국축산학회 1991 한국축산학회지 Vol.33 No.2

This study has examined the fertility rate, the viability and the incidence of heteroploidy of each group of Japanese quails divided by their line using 1,349 early embryos of the Japanese quails selected and bred for the levels of total plasma phosphorus. The fertility rate was geneally high in high plasma phosphorus level line and randombred line. but it was very low in low plasma phosphorus level line. The frequency of heteroploidy averaged about 12.08% and LP yielded much more heteroploid embryos than HP or RP

유전 및 환경적 요인에 따른 세포유전학적 연구 2 . 난중 및 Sex 별 염색체 이상

김철욱(C . W . Kim),손진기(J . K . Son),(N . S . Fachheimer) 한국축산학회 1991 한국축산학회지 Vol.33 No.2

This study has examined the fertility rate, the viability and the incidence of heteroploidy of each group of Japanese quails divided by their line using 1,349 early embryos of the Japanese quails were selected and bred for the levels of total plasma phosphorus. As a results, there was no difference in frequencies of heteroploidy of each egg weight and sex.

유전 및 환경적 요인에 따른 세포유전학적 연구 3 . 체중에 따른 염색체 이상

김철욱(C . W . Kim),손진기(J . K . Son),(N . S . Fechheimer) 한국축산학회 1991 한국축산학회지 Vol.33 No.3

This study has examined the fertility rate. the viability and the incidence of heteroploidy of each group of Japanese quails divided by their dam body weight and sire body weight Using 1,349 early embryos of the Japanese quails which were selected and bred for the levels of total plasma phosphorus. As regards the dam body weight. the DBW3 group whose dam body weight was the heaviest produced more heteroploidy than the DBWl or DBW2, but with regard to the sire body weight. the SBWl or SBW2 whose sire body weight was lighter produced more heteroploidy than SBW3 whose sire body weight was heavier.

유전 및 환경적 요인에 따른 세포유전학적 연구 4 . 산란능력에 따른 염색체 이상

김철욱(C . W . Kim),손진기(J . K . Son),(N . S . Fechheimer) 한국축산학회 1991 한국축산학회지 Vol.33 No.3

This study has examined the fertility rate, the viability and the incidence of heteroploidy of each group of Japanese quails divided by their egg productivity using 1,349 early embryos of the Japanese quails which were selected and bred for the levels of total plasma phosphorus. There were differences in the frequencies of heteroploidy of each egg productivity level, EP3 whose egg productivity was superior yielded more heteroploid embryos than EP1 or EP2.

교배조합과 산차 및 이유일령이 돼지의 도체형질에 미치는 영향

김철욱(C . W . Kim),진상근(S . K . Jin),김두환(D . H . Kim) 한국축산학회 1995 한국축산학회지 Vol.37 No.5

This study was carried out to investigate the effect of mating type, parity and weaning age on carcass traits as a dressing percent, backfat thickness of carcass and percent of carcass grade in swine. A total of I55 carcass were tested to compare the carcass traits with mating type breeding Landrace×Yorkshire sows to Duroc boar, Landrace×Yorkshire sows to Landrace boar, Landrace×Yorkshire sows to Yorkshire boar and Landrace×Yorkshire sows to Duroc×Hampshire boar, and first parity and over second parity, weaning at 28days and 32days. Dressing percentage was not significantly different among mating type, parity and weaning age and showed to be about 62%. Backfat of carcass was significantly thinner as 9.1 ㎜ in LY×Y mating type than in the other mating types, and the most thickness as 15.8㎜ was found in LY×DH mating type, but was not significantly different in parity and weaning age. There were not significant differences for the percent of carcass grade among mating type, parity and weaning age. Total percent of A and B grade showed to be in the order of 59.9% in LY×D, 48.7% 1_Y×L, 45.6% LY×Y and 32.5% LY×DH. In the interaction effects among mating type parity and weaning age, there were not significant differences for percent of dressing and carcass grade, but was significantly difference for backfat thickness of carcass in the first and over second parity of LY×L mating type. The percent of age carcass grade D was significantly higher as 21.5%r in the over second parity than in the first parity of LY×D mating type.

다배란과 수정란이식에 의한 젖소 산유능력의 유전적 변화에 관한 연구 1 . 선발방법에 따른 선발효과

김철욱(C . W . Kim),강대진(D . J . Kang),박충생(C . S . Park),이정규(J . K . Lee) 한국축산학회 1988 한국축산학회지 Vol.30 No.1

Thanks to the recent technical development of embryo transfer, it has become possible to produce many good offsprings from the genetically highly productive dairy cattle in a short period, With the help of this technical development this study aims to analysis genetic change by use of multiple evulation and embryo transfer (MOST), Under the condition that the heritability of milk yield is 0.25, the number of donors per male is 20, and the number of embryo transfers per donor is 20, comparing their respective selection effects of dam I, dam II, dam I + dam II, and the females and males selected according to the genetic selection index, 1 have found that the annual genetic change of the group selected by the genetic selection index is the highest. And the genetic change is the highest when one male per half-sib is selected.

교배조합과 산차 및 이유일령이 돼지의 생산형질에 미치는 영향

김철욱(C . W . Kim),진상근(S . K . Jin),김두환(D . H . Kim) 한국축산학회 1995 한국축산학회지 Vol.37 No.5

This study was carried out to estimate the effects of mating type, parity and weaning age on productive traits in swine. The body weights by increasing age, average daily gains, days to 110 ㎏ body weight and feed Conversion for 155 piglets produced in the first and over second parity from mating systems breeding Landrace×Yorkshire sows to Duroc boats, Landrace×Yorkshire sows to Landrace boar, Landrace×Yorkshire sows to Yorkshire boars and Landrace×Yorkshire sows to Duroc×Hampshire boars were investigated from their weaning age at 32 days or 28 days to the time they reached 110 ㎏ holly weight. The body weight at weaning was the highest at 9.2 ㎏ in the LY×Y mating type, but was the lightest at 5.5 ㎏ in LY×D mating type. Body weight gain from weaning to 70 days of age was the highest at 21.0 ㎏ in LY×D mating type, but was the lowest at 18.7 ㎏ in LY×Y mating type among the mating types. Body weight at 150 days of age was better in the group weaned at 32 days than at 28 days. The interactions among mating type and parity, body weight at different ages and weight gain were not statistically significant, but performance was better in the fitst and over second parity of LY×D mating type than in the other groups. Weight gain from weaning to 70 days of age was significantly better in groups weaned at 32 days than at 28 days of age. There was not a significant difference in the days to 110 ㎏ body weight according to the mating type, parity and weaning age, but was he shortest at 172 days in LY×Y mating type among the mating types. Feed conversion was not significant different according to the mating type and weaning age. but was significantly better in the over second parity than in the first parity.

동원체지수 및 상대적길이에 의한 돼지의 품종별 핵형분석

김철욱(C . W . Kim),손시환(S . H . Sohn),김형균(H . K . Kim),오하식(H . S . Oh) 한국축산학회 1994 한국축산학회지 Vol.36 No.4

To identity genetic markets, chromosomal morphology and structural patterns were analyzed by centromeric index and relative length in several swine breeds. The peripheral blood cells which were collected from the jugular vein were cultured and chromosomal morphology was analyzed from 50 Yorkshire, 50 Landrace, and 50 Duroc individuals. The morphological patterns of swine chromosomes consisted of metacentric, submetacentric, and acrocentric chromosomes. The number of swine chromosomes was 38(2n) which included the sex chromosomes XX or XY, and 36 autosomal chromosomes. In temps of relative length, the Y chromosome was shortest and the number 1 chromosome was longest at 1.9% and 11%, respectively. There were significant differences in relative lengthes among Groups III, IV, and Y chromosomes. The chromosomes of Landrace had a tendency to be longer than other breeds in Group III. In Group IV and Y chromosome, the chromosomes of Duroc were longer than other breeds. According to the analysis of centromeric index, the chromosomes were submetacentric and metacentric in Group I, acrocentric and submetacentpc in Group II, metacentric in Ciroup III, and telomeric acrocentric in Group IV. Sex chromosomes were metacentric with a centromeric index of 40% in X chromosome and 49.4% in Y chromosome. There was a significant difference in the centromeric index of chromosomes 1, 6, and 9. On the other hand chromosome 7 had the highest coefficient of variance in centromeric index. This indicated a possibility of polymorphism among individuals.