한우의 체위측정치에 대한 임신단계 및 제요인의 효과

최호성(H . S . Choi),백동훈(D . H . Baik),신원집(W . J . Shin),송주엽(J . Y . Song),나종삼(C . S . Na) 한국축산학회 1996 한국축산학회지 Vol.38 No.1

The records of 4,727 head of Hanwoo(Korean Native Cattle) cows were used to estimate the effects of the location, generation, pregnancy phase, year of birth and season of birth on body measurements at 24 months of age. Least squares means and standard errors of withers height, rump height, body length, chest girth, chest depth, chest width, rump length, rump width, thud width and hipbone width at 24 months of age were 118.93±0.84㎝, 121.00±0.73㎝, 134.88±0.80㎝, 166.12±1.42㎝, 61.9±90.58㎝, 36.48±0.83㎝, 45.46±0.50㎝, 40.08±0.47㎝, 37.21±0.55㎝ and 22.08±0.48㎝, respectively. The effects of the locations were highly significant on all of the body measurements and those of the generations were significant on rump length and rump width. The effect of the phase of pregnancy was significant on withers height, chest girth, chest depth, chest width, rump width and thurl width and that of the birth year was significant on all of the body measurements except withers height. The effect of the birth season was significant on withers height, rump height, body length, chest girth, rump length and hipbone width.

돼지의 조정기능발달에 관한 연구

신원집,이용빈,김종규,김창근 ( W . J . Shin,Y . B . Lee,J . K . Kim,C . K . Kim ) 한국축산학회 1974 한국축산학회지 Vol.16 No.3

In order to study on the spermatogenic function and the sexual maturity in male three-way crossbred ((Berkshire × Hampshire) × Landrace), this experiment was conducted to investigate the testicular development and the spermatogenic function by means of repeating biopsy testes at one month internals from one to 4 months of age and 15 days intervals from 4 to 6 months of age and the quality of semen collected after 27 weeks of age. 1. In the testicular development, the scrotum circumference increased steadily with increasing age up to 3 months of age, but increased rapidly after 4 months of age. The correlation between body weights, testicular lengths, testicular widths, and scrotum circumferences were statistically highly significant (p$lt;0.01). 2. The seminiferous tubules increased steadily at 3 months of age, increased apparently in diameter at 4 to 6 months of age. The percentage of intratubular tissue in the testis increased apparently at 4 to 6 months of age. 3. Only indifferent supporting cells, spermatogonia and spermatocytes were present in the seminiferous tubules at 3 months of age. Spermatids were appeared from 4 months of age, the percentage of which increased rapidly up to 5.5 months of age. 4. The first ejaculation of spermatozoa were observed in 1 of the 4 boars at 27 weeks of age, in 2 of the 4 boars at 29 weeks and in all of the 4 boars at 30 weeks. 5. The total volume ejaculated, sperm concentration and percentage of alive spermatozoa per ejaculate averaged 196.7㎖, 284.77x 10^6/㎖, and 80.0, respectively, at 35 weeks of age. On the basis of the above results it is concluded that three-way crossbred boars reached puberty at 27 seeks of age and can be used for breeding at about 35 weeks of age.

축우의 생시체중과 임신기간에 영향을 미치는 요인

신원집,백동훈,윤계봉,김용환 ( W . J . Shin,D . H . Baik,K . B . Yun,Y . H . Kim ) 한국축산학회 1986 한국축산학회지 Vol.28 No.10

Certain environmental effects were estimated on the birth weights and gestation lengths in three different types of cattle. A total of 4,144 calving records (572 Korean native, 2,300 Holstein and 1,272 Angus cows) were collected from various locations and analyzed according to the model including main effects of location, year and season of calving, parity of dam and sex of calf. The results obtained are as follows: 1. Least squares means for the birth weights of Korean native, Holstein and Angus calves were 24.1 ㎏, 39.1 ㎏ and 25.9 ㎏, respectively. Gestation length of Korean cow (285. 7 days) was longer than those of Holstein (278.4 days) or Angus (279.8 days) cows. 2. No significant location effect was found on the birth weights in the 3 breeds. All other effects caused significant birth weights except for the season of calving in Holstein. 3. The gestation lengths showed significance for all the effects studied except for the parity in Holstein and season of calving in Angus. 4. Birth weights of calves were being heavier and gestation lengths were getting longer as the year of calving progressed. 5. Korean native and Angus cows calved with heaviest birth weights at the seventh parity. 6. Male calves were heavier than female calves at birth and the gestation lengths tended to be longer when cows were carrying male calves.

한우의 체중 및 체위에 영향을 미치는 요인

최호성(H . S . Choi),나종삼(J . S . Na),백동훈(D . H . Baik),신원집(W . J . Shin) 한국축산학회 1988 한국축산학회지 Vol.30 No.8

Records on body weights and measurements of Korean native cows maintained as purebred breeding herds in Jang Soo area from 1981 to 1986 were analysed. Data from 374 registered cows were used to study the traits at birth, 3, 6, 12, 18 and 24 months of age. The results obtained are summarized as follows: 1. Overall least squares means and standard errors for the body weights at birth, 3, 6, 12, 18 and 24 months of age were 23.4±0.08㎏, 85.8±0.49㎏, 139.3±0.67㎏, 210.2±1.07㎏, 268.5±1.00㎏ and 321.4±1.85㎏, respectively. 2. Effect of period of birth showed significant differences in most of the traits from birth to 12 months of age. 3. In general, cows in 2nd generation were superior in most of the traits studied to those in 1st, which represents the effects of sire, selection and cow registration. 4. Cows born in fall or winter were heavier at 6 and 12 months of age than those born in other seasons. 5. Calves born to the cows at 5th parity & over were superior in several body measurements.

돼지의 산자수와 이유시 생존율에 미치는 환경요인의 효과

나종삼(J . S . Na),최호성(H . S . Choi),백동훈(D . H . Baik),신원집(W . J . Shin) 한국축산학회 1988 한국축산학회지 Vol.30 No.8

This study was conducted to investigate the effects of parity, season and year of farrowing on the preweaning traits of swine based on the data obtained from 1,370 litters of Duroc, Hampshire, Landrace and Yorkshire breeds. The sows were raised at the Swine Breeding Station of National Livestock Cooperatives Federation in Yeong Kwang from 1983 through 1986. Least squares means were computed within breed and the results are summarized as follows: 1. Overall least squares means for litter size alive were superior in Landrace (9.35 head) to those in other breeds. 2. For the litter sizes at 21 and 42 weaning days of age, Landrace showed best and was followed by Yorkshire, Duroc and Hampshire in order. 3. Percentages of weaned pigs were 93.5 in Landrace 90.0 in Yorkshire which showed about 1(1% higher than those in the other two breeds. 4. Sows furrowed at 3rd or 4th parity showed better performances for most of the traits studied. 5. Pigs born in spring or fall were superior to those born in summer or winter. The year 1984 in general seemed to be better than any other years included in this analysis.

Pellet Semen 의 Glycerol 첨가방법과 평형시간이 한우의 정액성상과 수태에 미치는 영향

김종규,서국성,신원집,이용빈 ( J . K . Kim,G . S . Suh,W . J . Shin,Y . B . Lee ) 한국축산학회 1973 한국축산학회지 Vol.15 No.2

This experiment was conducted to study the possibility of pellet semen as a replacement for ampoule semen and simplifying the method of glycerol addition to the egg yolk extender with Korean native cattle. Glycerol was added once and twice to the egg yolk semen extender and equilibration time was 6, 12 and 18 hrs. respectively. Each semen was freezed in the liquid nitrogen and thawed in a 5℃ water bath. Inseminated artificially frozen semen to the cows and calculated the fertility (N.R. 60-90 days) and sperm living index. The results obtained are as follows: 1. No significant difference was found between once and twice additions of glycerol on the living index of spermatozoa. 2. No significant difference was found between, 6, 12 and 18 hours equilibration intervals on the living index of spermatozoa. 3. Conception rates in the Korean Native Cattle of pellet and ampoule semen were 55.1% and 59.2% respectively. The results indicated that conception rate of pellet semen was no better than the ampoule semen.

토끼의 수정란 이식에 있어서 난세포 분열기와 이식부위에 관한 연구

김중계,서국성,신원집,오연각,설동섭,김상철,이용빈 ( J . K . Kim,G . S . Suh,W . J . Shin,Y . K . Oh,D . S . Sul,S . C . Kim,Y . B . Lee ) 한국축산학회 1974 한국축산학회지 Vol.16 No.1

This experiment was carried out to study a suitable method of fertilized ova transfer in the rabbit. A total of 160 ova at 2 to 16 cell stages or at 16 cell to morula stages from superovulated donors were transferred at the rate of 8 per animal to the fallopian tubes and uterus of 20 recipient females, mated 24 hrs. earlier to vasectomised male. Irrespective of the site of transfer, the proportion of ova developing to term following 16 cell to morula stage transfers was more than that following 2-to 16 cell stage transfers. And uterus transfers were more successful than fallopian transfers in both 2 to 16 cell stages and 16 cell to morula stages. The results with 16 cell to morula stage transfers at the uterus were better than those in any other groups. Fourteen of 20 recipients became pregnant, of which il produced a total of 32 offsprings, and litter size averaged 2.9 with variation from 1 to 6.

돼지에 있어서 생시 (生時) 및 이유시산자수에 (離乳時産仔數) 대한 유전 및 환경적 효과에 관한 연구

신원집 ( W . J . Shin ) 한국축산학회 1984 한국축산학회지 Vol.26 No.2

This study was conducted to determine the effects of breed, parity, year, season and type of service on litter size at birth and weaning in swine. The least square means were estimated from 609 litters of Landrace, Hampshire, Yorkshire and Duroc raised at Swine Farm, Jeil Sugar Co. from 1977 to 1980. The results obtained are as follows: 1. The least square means over all litters studied were 10.32 ± 0.15 pigs at birth, 8.22 ± 0.13 at weaning. 2. The effect of breed showed significant differences at the 1% level in both traits studied. Landrace and Yorkshire tended to be larger than Hampshire and Duroc in both traits. 3. The effect of parity also showed highly significant difference at birth, but not at weaning. The litter size at birth was smallest in 1st parity and increased as the parity progressed. The litter size was gradually decreased after 7th parity. 4. The effect year was highly significant for the litter size at birth, but not significant differences at weaning. 5. The effect of season was not significant in both traits studied. 6. The effect of type of service was not significant in the litter size at birth and at weaning.

한우의 조기임신진단에 관한 연구

신원집 ( W . J . Shin ) 한국축산학회 1980 한국축산학회지 Vol.22 No.5

This experiment was carried out to determine the concentration of progesterone in the serum of Korean native cows during the early pregnancy and to apply it to early pregnancy diagnosis. Blood samples were collected daily by jugular puncture on day 19 to 25 after mating and during a single estrous cycle. progesterone concentrations in the serum were analyzed by Radioimmunoassay (R. I. A) method. The progesterone level in pregnant cow from 19 days to 25 days after mating(2.93-5.02 ng/㎖) was significantly(p$lt;0.01)higher than those of non-pregnant cow (1.57-1.66ng/㎖), present data clearly indicates that the serum content of the progesterone on day 21 to 23 of pregnant cow (4.23±1.00 ng/ ㎖) can be used as pregnancy diagnosis index for Korean native cow.

한우의 조정기능발달에 관한 연구 1 . 한우와 교잡종의 전반기 고환발육과 조정기능

이용빈,김창근,신원집,박충생 ( Y . B . Lee,C . K . Kim,W . J . Shin,C . S . Park ) 한국축산학회 1973 한국축산학회지 Vol.15 No.2

In order to study on the development of the spermatogenic function and the sexual maturity between the Korean purebred and three-way crossbred ((Angus × Korean purebred) × Holstein), this experiment was conducted to investigate the testicular development and the spermatogenetic function by means of repeating biopsy at one month intervals from one to 9 months of age with 6 Korean purebreds and 3 three-way crossbreds. 1. In the testicular development, the scrotum circumference of the Korean purebred and three-way crossbred increased steadily with increasing age. The scrotum circumferences of the Korean purebred and three-way crossbred were 19.4 ㎝ and 28.9 ㎝ at 9 months of age, respectively, and doubled to one month of age. The testicular width and length increased rapidly from 6-7 months of age, but the differences between two groups were not statistically significant. 2. The seminiferous tubules in the testis of two groups, solid at 3 months of age, increased appearently in diameter at 5 to 6 months of age, but were not reached mature size. 3. Only gonocytes and indifferent supporting cells were present in the tubules at 3 months of age and spermatogonia appeared from 5 months of age, spermatocytes increased rapidly from 6 months of age and spermatid were seen for the first time in the 7 months old Korean purebred and three-way crossbred. On the basis of the above results it is concluded that sexual maturity of three-way cross bulls was somewhat earlier than the Korean bulls, but the difference of two groups was not significant.