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돈 지육 ( 支肉 ) 의 등급기준에 관한 연구 2 . 도매시장 출하돈의 도체중과 도체가격
정숙근,이길왕 ( Sook Keun Cheong,Kil Wang Lee ) 한국축산학회 1983 한국축산학회지 Vol.25 No.3
This study was carried out to investigate the distribution of swine carcass weight and the changes in carcass price by the weight, using the weight and price data for 22,882 swine carcasses marketed on every 1st and 15th day of the month during 1980 and 1981 in Seoul wholesale market. Most of marketing number and carcass price of swine were the highest at 53.2 ㎏ of carcass weight, but tend to decrease according to increase or decrease than that weight.
한우 도체의 품질 평가에 관한 연구 2 . 축산물 도매시장 출하우의 도체중 분포와 도체 단가의 변화
이길왕,정숙근 ( K . W . Lee,S . K . Cheong ) 한국축산학회 1983 한국축산학회지 Vol.25 No.4
This study was carried out to investigate the effect of carcass weight on characteristics of carcass grading and the price of carcass based on 3913 cattle slaughtered every 15 days at wholesale market in Seoul during 1980 and 1981 The results obtained are summarized as follows; 1. Of all cattle data analyzed, the percent of Korean Native Cattle, Holstein, and Others was 75.7, 18.4 and 5.9%, respectively. 2. The mean values of live weight and carcass weight were 428.36 and 226.66㎏, respectively aced dressing percent was 52.9%. 3. The carcass weight which was the most marketed at wholesale market was 209.1-229.0㎏. 4. When carcass weight was about 201.0㎏, the carcass was marketed to unit price of while the unit price of carcass tended to decrease as carcass weight was increased.
이장형,장원경,정숙근 ( J . H . Lee,W . K . Chang,S . K . Cheong ) 한국축산학회 1985 한국축산학회지 Vol.27 No.5
To study the fetal development in swine at 10 days interval from 20 to 110 days of gestation, 1 to 4 sows were treated and 11 to 52 fetuses were obtained each time, and number of implanted and alive fetus, fetal survival rate, fetal body weight and body weight gain, body length and umbilical cord length were measured. The average number of fetus implanted was 17.6 and was not affected by the days of gestation, but the number of alive fetus and survival rate of fetus was decreased as pregnancy progressed. The number of implanted & alive fetus were almost the same in both utrine borns. The weight of fetus was significantly increased as the pregnancy developed, especially after 60 days of gestation and the weight change at every 10 day was also increased but the body weight increasing rate was decreased. In addition average daily gain of fetus, the length of fetus & umbilical cord were increased as the pregnancy developed.
임신말기와 포유기의 우지첨가 수준이 암퇘지의 번식능력에 미치는 영향
이장형(J . H . Lee),정숙근(S . K . Cheong),전병찬(B . C . Jeon) 한국축산학회 1987 한국축산학회지 Vol.29 No.11
To study on the effect of tallow addition to the ration on the estrus performance after weaning in sows and growth performance of piglets, 85 two way crossbreds (Large white × Landrace) used. They were fed tallow added to ration (0,2, 4 or 6%) from 80 days of gestation to 3 weeks after furrowing. The results obtained are as follows ; 1. Body weights of sows at furrowing among treatments were not different, the body weight loss during lactation decreased. (p$lt;0.05). 2. The birth weight and litter size were not different among treatments. However, the growth rate and average daily gain of piglets during suckling period were better in the pigs fed supplemental tallow than control. The length of suckling period can also be reduced by the addition of tallow to the ration. (p$lt;0.01) 3. Litter size and survival rate during the suckling periods were increased as the tallow level increased. 4. As the level of tallow increased the percentage of sows exhibited estrus within 10 days after weaning increased. The results of this experiment indicated that the addition of tallow to the ration of sows in gestation and lactation periods decreased the body weight loss of sows, increased daily gain and growth rate of piglets, and shortened the interval from weaning to first estrus.