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저수태 한우에 대한 성선자극 호르몬 방출호르몬 투여 효과
임석기,우재석,윤상보,전기준 韓國受精卵移植學會 1997 한국동물생명공학회지 Vol.12 No.1
The objective of this study was to enhance the pregnancy rate of repeat-breeder Hanwoo with gonadotropin-releasing hormone(Gn-RH) at the time, dose and site of administration.The results obtained were summaried as fallows:1.Ovulation time and pregnancy rate following GnRH administration time was 46.0, 27.4, 42.0 and 43.2hr and 33.3, 57.1, 37.5 and 40.0% at non-treatment, estus, 1st A' and 2nd Al treatment, respectively.2. Ovulation in repeat-breeder was induced 100% within 24hr with GnRH administration at the time of estrus.3. Ovulation time and pregnancy rate following GnRH adminstration dose and site was 25.2, 32.6, 17.6 and 27.6hr, and 28.6, 42.9, 75.0 and 66.7% at 50g+IU, 50g+IM, 100g+IU and 100g+IM treatments, respectively. It is concluded that GnRH administration for repeat-breeder was enhanced the pregnancy rate when treated with 100g intrauterine at the time of estrus.
한우에 있어서 FSH-P 투여량과 에너지수준이 정상수정란의 생산에 미치는 영향
임석기,전기준,우제석,장선식,박준철,정종원,윤상보 韓國受精卵移植學會 1997 한국동물생명공학회지 Vol.12 No.3
The present study was carried out to investigate effect of FSH -P dose and energy level on normal embryo production after superovulation in Hanwoo. The results obtained were as follows ; 1. There was a significant effect of dose of FSH-P on normal embryo production in Hanwoo(P5.9), 40(4.9i5.7), 50mg(2.22.6). 2. The plasma P levels on the first treatment day were higher group( >4ng /ml) than lower group( <=4ng /ml), produced significicantly(P<0.05) higher number of normal embryos. 3. There was a significant effect of energy level on normal embryo production in Hanwoo(P6.0), number of normal embryos were higher than TDN 70%(5.16.5) and TDN 130%(4.42.6) 4. The donor returned to normal estrus after superovulation were 44.8, 28.4 and 29.9 days by TDN 70, 100 and 130%, respectively.
가을송아지 거세한우의 육성기 방목 및 농후사료 급여수준이 성장 및 도체특성에 미치는 효과
임석기,우제석,강수원,손용석,정종원 한국동물자원과학회 2001 한국축산학회지 Vol.43 No.5
This study was conducted to investigate the effect of pasture grazing and concentrate feeding levels for 6 months of growing steps in autumn born Hanwoo steers. Feeding trial was conducted with 3 treatment groups which were T1(full feeding of concentrate and hay for 18 months) and T2(pasture grazing with 1.5% of apparent body weight in concentrate for 6 months and concentrate full feeding for pre-and post-pasture grazing), T3(1.5% of apparent body weight and full feeding in concentrate at pre-and post-grazing period, respectively). During the over-all period, average daily gains increased higher in the order of T2, T3 and T1. TDN intakes required per unit of kilogram-gain were 7.922 to 8.695㎏(average 8.347㎏) and decreased in the order of T2. T1 and T3. Dressed carcass and retailed cut percentage was 61.1 to 63.7%(average 62.1%) and 62.4 to 66.1%(average 64.5%1, respectively, with significantly difference(P$lt;0.05) and the former were increased in the order of T1, T2 T2 and T3 but the latter were decreased in the order of T2, T3 and T1. Appearant rate of 1st grade or more in meat quality was 62.5 to 87.5%(average 75%) and increased in the order T1. T2 and T3. Back-fat thickness and marbling score was 7.0 to 10.5㎜(average 8.4㎜) and 4.5 to 5.2(average 4.8), respectively. and the former was higher in the order of T1, T2 and T3 but the latter was higher in the order of T1, T3 and T2. In chemical composition of beef. the percentage of moisture, protein, fat and ash were 64.8 to 67.6%(average 66.6%). 18.9 to 20.1%(average 19.6%). 10.1 to 14.4%(average 11.6%), 0.88 to 0.94% (average 0.92%), respectively. In addition. the rate of moisture. protein, ash were higher but fat was lower in T2 and T3 than in T1. Income was higher in T2 and T3 than in T1, and income of T2 was increased by 29 percent in comparison to T1. According to the above results it may be concluded that autumn born Hanwoo steers have to raised from the coming spring to autumn on the rotational grazing pasture with 1.5% of apparent body weight in concentrate. Thereafter it is necessary to increase the concentrate by up to full feeding level for about l2 months to produce high quality of meat and increase income.
임석기,강수원,손용석 한국동물자원과학회 2000 한국축산학회지 Vol.42 No.5
A series of experiments were carried out to determine the milk production potential and milk composition as well as physico-chemical properties in Korean cattle depending on an effective milking method. Total 620 milk samples were collected bi-weekly for 6 months post-partum from one hundred and two nursing cow-calf pairs on test for 5 year period. The $quot;machine milking while suckling$quot; method, which had been developed and eventually proved to be easiest and most effective in the experiments testing various milking methods, was adopted throughout 180 days of lactation. In this method each cow was milked by a portable vaccum-operated bucket milker on 24-hour shifts at two teats of one udder while the other two teats were being suckled simultaneously by her calf. The average daily and total 180-day yield of dams were 3.49 and 627.5㎏ , respectively, although considerable individual variations in daily production existed ranging from 1.60 to 6.20㎏ . The average daily yield measured at 30 day intervals for the first six months after calving were 4.73, 4.34, 3.70, 3.21, 2.73 and 2.20㎏ , respectively. In general, the peak lactation was attained about 10th day after calving with its average coming up to 5.l㎏ . The milk production decreased thereafter by 0.017㎏ per day throughout the rest of the lactation, exhibiting a quite linear decline with the gradient of 4.94% every 10 day period. The physico-chemical properties such as specific gravity, pH and acidity of total milk samples were about 1.035, 6.68 and 0.215, respectively. The concentrations of butter fat, protein, lactose, ash, total solids and solids-not-fat were 4.69, 4.10, 4.23, 0.85, 13.86 and 9.18%, respectively. It is concluded that this new method, that is the machine milking while suckling, may be a usefull milking methods for estimating dam's milk yield and measuring physico-chemical properities as well as for illuminating milk composition of Hanwoo. There is a wide difference in individual milk performance. If a cows of full capacity in milk production and composition is sellected by the utilization of this method and the foundation of mating system for improvement of Hanwoo is established, it may be greatly decreaed the production cost of Hanwoa calf.
임석기,조희찬,Lim Seok ki,Cho Hee chan 한국자원리싸이클링학회 2003 資源 리싸이클링 Vol.12 No.4
혼합되어 배출되는 플라스틱을 분리 및 선별하기 위한 기존의 방법들은 플라스틱 비중의 유사성, 입도의 제한 등의 요인으로 인해 단일재질의 플라스틱으로 분리하는데 많은 어려움이 따른다. 본 연구에서는 플라스틱의 재질별 연화온도와 점착 특성이 다른 점에 착안하여 열 점착 방식을 이용하여 혼합 플라스틱을 분리하는 방식을 개발하고자 하였다. 일상생활에서 사용되는 범용수지를 시료로 이용, batch 방식의 실험장치를 제작하여 온도를 변화시키면서 각 플라스틱의 점착 온도 범위, 점착율을 실험적으로 조사하였다. 또한 접촉시간과 플라스틱의 착색제의 유무, 입자 크기 등 다양한 조건들을 변화시키면서 그에 따른 영향을 조사하였으며 이를 실제 혼합 폐 플라스틱에 적용하여 분리효율을 조사하였다. 실험 결과 혼합 플라스틱에서 비중이 유사한 LDPE와 HDPE, PET와 PVC, 그리고 PP와 PVC 등을 온도의 변화에 의해 선택적으로 분리할 수 있음을 확인하였다. Separation of mixed plastics is not a simple task due to similarities of specific gravity and limitations of sizes, etc. In this study, a new technique was developed to separate plastics selectively by a thermal adhesion method using the different softening or melting temperatures of various types of plastics. Tests were conducted to investigate softening or melting temperatures and adhesion probabilities of plastics with change in temperature. Tests also were conducted to analyze the operating variables, including contact times, size and color pigment. It was founded that LDPE, HDPE and PVC, PET, etc among mixed plastics could be separated selectively according to the change of temperature.