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정진관,임경순,박영일,오봉국 ( J . K . Jung,K . S . Im,Y . I . Park,B . K . Ohh ) 한국축산학회 1986 한국축산학회지 Vol.28 No.6
Genetic gain of cattle by embryo transfer was estimated to be 19.25㎏ per year in the body weight of beef rattle at sexual maturity and 155.7㎏ per year in 305 day milk yield of dairy cattle.
정진관(J . K . Jung),유승환(S . H . Yoo) 한국축산학회 1990 한국축산학회지 Vol.32 No.11
The number of chromosomes and their banding patterns in Korean native pigs were investigated to obtain the basic information on the improvement of them. Followings are the main results obtained. l. The number of chromosome of Korean native pigs was 38(19 pairs), among which the number of autosome was 36 and that of sex chromosome was 2(XY in male and XX in female) 2. In a karyotype, chromosomes from number 1 to 5 were submetacentric, from number 6 to 7 were acrocentric. Chromosomes from 8 to 12 and X and Y chromosomes were metacentric and from 13 to 18 were telocentric.
정진관 ( J . K . Jung ) 한국축산학회 1987 한국축산학회지 Vol.29 No.4
To study the relationships between lactation and reproduction traits, 19 heads of Holsteins were used. From December, 1983 to July, 1986 milk yields were measured during lactation through 3-4th parity every month by calving month. Calving interval and services per conception (SPC) were also measured by parity and by calving month. Followings are the main results obtained from this experiment. 1. After calving the average daily milk yield increased sharply for 2 month and then decreased continuously until the end of lactation. 2. The average daily milk yield increased as the parity increased upto 3-4th parity and the average daily milk yield of cows calved in July, August and September was less than that of cows calved in other months of the year. 3. There was no significent difference among parities or calving months in calving interval. However, SPC increased as the parity increased and SPC of cows calved from July to December was more than that of cows calved from January to June. 4. The correlation coefficients between lactation length and calving interval, lactation length and SPC, and calving interval and SPC were 0.799, 0.312 and 0.344, respectively.
정진관(J . K . Jung),장원경(W . K . Chang),유승환(S . H . Yoo) 한국축산학회 1990 한국축산학회지 Vol.32 No.8
To investigate the effect of PMSG injection on the estrus, and the quality of embryos after mating and to determine the possibility of pig embryo freezing, two experiments were conducted. In experiment 1, sows or gilts were injected 1,000IU or 1,5001U of PMSG and measured interval to first estrus and duration of estrus, and after the mating the number of C. L. formed, the number of embryos collected, fertilization rate and pregnancy rate were investigated. In experiment 2, embryos were frozen using glycerol or DMSO as a cryoprotectant and survival rate and duration of survival were investigated. The results of these experiments indicated that by the injection of PMSG the interval to first estrus after weaning was reduced and the duration of estrus increased, while there was no significant difference in pregnancy rate between treatments. In addition the number of C. L. formed and the number of embryos collected increased by the PMSG injection, but the fertilization rate and the number of embryos transferable was most in 1,000IU of PMSG treated group. The recovery rate of embryos collected from sows mated following natural estrus was 74% and fertilization rate of them was 96%. Of 48 embryos frozen, 54.2% were survived after thawing and survival rate and duration of survival were better when DMSO was used as a cryoprotectant than glycerol was used.
돼지에 있어 progesterone 투여에 의한 분만의 조절
정진관(J . K . Jung),김정봉(J . B . Kim) 한국축산학회 1990 한국축산학회지 Vol.32 No.5
This experiment was conducted to investigate the effect of progesterone administration on the farrowing of sows and growth performance of piglets born from them. Total 30 sows were allotted to 5 treatments(6 sows per treatment) including control group. In groups 1 and 2, 10mg of Lutalyse was injected intramuscularly to each sow on day 113 and 112 of gestation, respectively. In group 3, 2mg of Altrenogest was administered on day 112 of gestation and 10mg of Lutalyse was injected 24hours after the Altrenogest administration and in group 4, 2mg of Altrenogest was administered on day 113 of gestation. Interval to farrowing and gestation length decreased by PGF₂α injection and increased by progesterone administration. Duration of farrowing was longest when PGF₂α was injected on day 112 of gestation(4.7hrs) and it was shortest when PGF₂α was injected on day 113 of gestation(2.2hrs). There was no significant difference in total litter size, number of pigs born alive and growth rate to 5 weeks between treatments. The body weights of piglets at 3 weeks and 5 weeks of age from the sows administered progesterone were heavier than those of piglets from the sows of the other treatments. However, there was no significant difference in the days to first estrus after weaning between treatments.
우유중 Progesterone 분석에 의한 조기임신진단에 관한 연구
이종문(J . M . Lee),양보석(B . S . Yang),정진관(J . K . Jung),김종욱(J . W . Kim) 한국축산학회 1990 한국축산학회지 Vol.32 No.12
The early pregnancy diagnosis was carried out to improve the reproductivity of dairy cattle by the measurement of progesterone concentration in the milk. The whole or strip milk samples for the determination of progesterone concentration by the radioimmunoassay were taken from seventy-live pregnant or nonpregnant dairy cows. 1. The concentration of progesterone in the milk of pregnant cows was 13.8 n mol/ml on day 9 of pregnancy and increased continuousely until day 23 of pregnancy, but in open cows it decreased from l7th day after the estrus and it was 0.5-0.6 n mol/ml in 21-23 day after the estrus. 2. The precision of pregnancy diagnosis on 19-23 days of pregnancy was 72.6%-84.3% for the pregnant cows and 100%, for open cows. 3. The precision of pregnancy diagnosis by milking method was 79.0-89.1% in whole milk and 81.3-100% in strip milk.
PCR 기법을 이용한 소 Y- 염색체 특이적 DNA 단편 증폭에 의한 성판별 연구
오성종(S . J . Oh),이창수(C . S . Lee),양보석(B . S . Yang),정진관(J . K . Jung),성환후(H . H . Seong),임경순(K . S . Im) 한국축산학회 1993 한국축산학회지 Vol.35 No.5
This experiment was conducted to indentify the sex of cattle using PCR. Bovine Y-specific and bovine specific sequences as primer were synthesised and genomic DNA was extracted from blood of Korean Native cattle and Holstein. When the bovine specific sequences were added to the reaction buffer as primer, both male and female genomic DNAs were amplified .and formed bands(2166p) after the electrophoresis. However, when the Y-specific sequences were added, only male genomic DNA was amplified and formed bands(141hp). PCR products did not increase when the amount of bovine specific DNA as primer was more than 50ng. Two distinct DNA fragments were detected when amplified by two-step PCR method(that is, amplification with bovine specific DNA for 30 cycles after the ampilfication with Y-specific DNA for 30 cycles).