지리산 면양목장조성에 관한 연구 제7보 자연초지에서의 면양사육시험

정현승,문승식,염월형,강창중 ( H . S . Chung,S . S . Moon,W . H . Yom,C . J . Kang ) 한국축산학회 1974 한국축산학회지 Vol.16 No.1

Five of ten Corriedale weaning ewe-lambs were fed native grasses with or without some concentrate supplements on the native grasslands for sheep range development in the Mt. Chiri from July 6, 1970 to October 30, 1971. 1. The daily body gain of ewes fed native grasses with or without concentrate supplements was averaged 110g and 122g respectively for the first grazing period and 64g and 63g for the second grazing period. There were no significant differences in the daily gain for the periods between both groups. The daily gain for the first dry-lot feeding period in the ewes fed supplements was 46g, which was significantly (P$lt;0.05) more than that in the ewes fed native grasses (33g), but there was no significant difference in the over-all average daily gain through the experimental period between both groups (65 vs. 63g). 2. The total digestible nutrients required for 1㎏ body gain were 10.549㎏ and 7.973㎏ respectively, in the ewes fed native grasses with or without concentrate supplements through the whole periods. 3. The fleece yield in the groups of feeding the native grasses with or without supplements was averaged 3.43 and 3.45㎏ respectively. 4. Three of four or five ewes used were pregnant in the group of feeding native grasses with or without supplements. 5. In the group of feeding native grasses with supplements, three of five ewes were infected with Lumbar paralysis from which one of them was died during the first grazing period. 6. The gross revenue and labor cost per ewe were similar in both groups, but the concentrate supplement cost was 2,987 won which resulted in decrease of farm income for the group of feeding native grasses with concentrate.

연탄회 급여가 돼지의 철분주사대용 및 미량광물질공급원으로서의 효과

정현승,한인규,유동준,김철욱 ( H . S . Chung,I . K . Han,D . J . You,C . W . Kim ) 한국축산학회 1985 한국축산학회지 Vol.27 No.6

This experiment was conducted to study the effects of Briquette ash as a substitutive material for Fe injection and mineral supplements in pigs from April 1, 1981 to July 19, 1984. Birth weight of the Briquette ash fed group was slightly higher than that of the control group. From birth to weaning time the Briquette ash caused high survival rate (p$lt;0.02) compared to the control groups. During growing-finishing period, pigs fed Briquette ash ad libitum gained more weight and consumed more feed. Feed conversion was also improved by feeding Briquette ash ad libitum. In conclusion, it might be suggested that the pigs farrowed from sow fed ad libitum Briquette ash could grow without Fe injection and when fed Briquette ash ad libitum, grorving-finishing pigs could gain more rapidly.

돈방 상부공간을 이용한 가토사육이 돼지의 증체에 미치는 영향

정현승,한인규,유동준,김철욱 ( H . S . Chung,I . K . Han,D . J . Yoo,C . W . Kim ) 한국축산학회 1985 한국축산학회지 Vol.27 No.7

This experiment was carried out to investigate the effects of the falling feces and residual roughage when rabbit was raised on the interior upper space of the pig pen on the growth of 43 pigs farrowed. Animals were fed either formula feed only (A), formula feed + rabbit feces (B), formula feed + rabbit feces + residual roughage (C), or formula feed + residual roughage (D). Body weight gain, feed consumption and feed conversion of the group A were significantly (p$lt;0.05) poorer, than those of the other groups. Feed cost required to gain 1 ㎏ was considerably (p$lt;0.05) lower in the group C than in the other groups. The concentration of urea N in blood plasma of group D was significantly (p$lt;0.05) higher than those of the other groups. Ham and fat portions of the group B were significantly heavier than those .of the group A.

지리산 면양목장조성에 관한 연구 제6보 지리산의 목초재배시험

정현승,문점동,이종렬,김상철 ( H . S . Chung,J . D . Moon,J . R . Lee,S . C . Kim ) 한국축산학회 1974 한국축산학회지 Vol.16 No.1

Orchardgrass, tall fescue, ladino clover, and alfalfa were sown on the plowed native grasslands of 600 to 900m altitude in the Mt. Chiri on September 10, 1970. Germinating date, winter survival ratio, plant length at each time of 5 successive cuttings, and the pasture yield through October, 1971 were observed. The soil properties of the fields were characterized as pH: 5.5 and loamy, and O.M. : 13.3%. The fertilizers such as N, P₂O_5, K₂O, lime, and borax were applied on the fields. And yield of native grasses, which were fertilized or not, was determined. 1. The germinating dates were ranged from September 19 to September 26 and were 2 to 3 days later on the upper lands. Tall fescue was germinated 2 to 4 days earlier than other pasture species and alfalfa was the latest germinating pasture species of them. 2. Orchardgrass showed the highest winter survival ratio (58.6 to 72.2%) and alfalfa showed the lowest (31.6 to 64.5%). The winter survival ratio of alfalfa and tall fescue decreased critically in the fields of 700 to 900 and 900m altitude, respectively. 3. The average plant length of 5 cuttings was ranged from 31.6 to 37.3 ㎝ in the 3 field locations. The shorter pasture grew in the higher altitude. The orchardgrass was longest in all the fields (45.0 to 58.2 ㎝). 4. Orchardgrass showed the most highest hay yield (719 to 825 ㎏/10a) and alfalfa showed the least (645 to 725 ㎏/10a). The native grasses showed the hay yield of 803 to 825㎏/10a in the non-fertilized plot and 877 to 829㎏/10a in the fertilized plot in the first year.

연탄재 어즙흡착사료가 육성돈의 성장과 경제성에 미치는 영향

정현승(H . S . Chung),김철욱(C . W . Kim),한인규(I . K . Han),하종규(J . K . Ha),최윤재(Y . J . Choi),유동준(D . J . Yu) 한국축산학회 1989 한국축산학회지 Vol.31 No.8

This experiment was conducted to study the effects of substituting ration with fish soluble absorbed briquette ash feed and its economic values on growing pig. A total number of 60 pigs was divided into 4 treatments: Control, T1, T2, and T3 each substitution with 0, 3, 5 and 10% of ration with fish soluble absorbed briquette ash feed. The results were summarized as follows; 1. Average daily feed intake was highest it T3(1.61kg) and T2(1.59kg) $gt; T1(1.55kg) $gt; control(1.54kg) respectively showing that the feed intake increases according to the increasing level of concentrated fish soluble. 2. Average daily gains of pigs fed fish soluble absorbed briquette ash Iced were significantly (p $lt;0.01) higher compared to those of pigs fed control diet. In addition, feed conversion was also improved significantly(p $lt;0.01) showing that the best result was in T2 group. The optimum level of substitution seems to he 5% though the difference between treatments was not statistically significant. 3. The digestibility didn`t show significant differences between the experimental one diets. 4. There was no significant changes in chemical composition during storage period of nearly one month. 5. In economic analysis feed cost required per kg body weight gain was cut down by 19.14 Won in TI; 24.62 Won in T2 ; 21.10⁴Won in T3 than that in the control diet.

연탄재 어즙 흡착사료 개발에 관한 연구

정현승(H . S . Chung),김철욱(C . W . Kim),한인규(I . K . Han),하종규(J . K . Ha),유동준(D . J . Yu) 한국축산학회 1988 한국축산학회지 Vol.30 No.3

This experiment was conducted to investigate the compositions of minerals and amino acids in brequette ash absorbed with concentrated fish soluble and to study the effects of brequette ash-fish soluble absorption feed on growth performance of pigs. A total number of 10 pigs (Landrace (♀) × Berkshire (♂) were divided into 2 treatments which had 5 replicates per treatment and fed the experimental diets for a period of 84 days. The results obtained were summarized as follows : 1. As the levels of fish-solubles, which were absorpted to brequette ash, increased, the contents of minerals and amino acids increased. 2. Average daily gains of pigs fed brequette ash-fish soluble feed were higher compared to those of pigs fed control diet. And feed efficiency was unproved by adding brequette ash concentrated fish soluble to control diet. 3. In economic analysis, feed cost required per ㎏ body weight gain for pigs fed brequette ash absorbed with concentrated fish soluble was less than those for pigs fed control diet. And the periods to reach marketing weights (90㎏) were shorter in brequette ash absorbed with concentrated fish soluble treatment by 14 days than in control.

부화율에 미치는 제요인에 관한 연구 ( 란중 , 란형 , 란색 및 세란이 부화율에 미치는 영향 )

정현승 ( H S Chung ),한봉우 ( B W Han ) 한국축산학회 1970 한국축산학회지 Vol.12 No.2

This experiment was carried out to determine the effects of egg weight, egg shape, egg color and egg washing on the hatchability using 9,600 eggs laid from 2 years old white Leghorn. New Hampshire eggs 3,200 laid from 2 years old were used by egg color level on hatchability. The results were summarized as follows: 1. There was a highly significant difference(P$lt;0.01) in hatchability by the egg weight level. T₃ lot(55∼58g) had the highest hatchability of T₁ lot(51∼62g), T₂ lot(51∼54g) and T₄ lot(59∼62g). Heavier eggs had lower hatchability than the light eggs. 2. In the egg shape Ta lot(egg shape index 0.7) had the highest hatchability. T₃ lot(egg, shape index$gt;0.7) had lower hatchability than T₄ lot(egg shape index[0.7). 3. In the egg color T₂ lot(dark brown) had the highest hatchability of T₁ lot(random selected eggs), T₃ lot(medium brown) and T₄ lot(light brown). The thinner the color of eggs were the lower hatchability they had. There was a highly significant difference(P$lt;0.01) for hatchability of treatments in the egg color level. 4. There was a highly significant difference(P$lt;0.01) in hatchability by the egg washing level. T₁ lot(unwashed eggs) had the highest hatchability and T₄ lot(dirty eggs) had the lowest hatchability of all experiment lots. Comparing T₂ lot(partial washed eggs) and T₃ lot (all washed eggs) T₂ lot had higher hatchability than T₃ lot.

도시철도차량의 충돌압괴 특성분석

정종덕(J. D. Chung),권태수(T. S. Kwon),정현승(H. S. Jung),박기준(K. J. Park),편장식(J. S. Pyun) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.10월

Silver Nitrate 용액의 정소내 주입에 의한 돈의 거세효과에 관한 연구

강양수(Y . S . Kang),박충생(C . S . Park),정현승(H . S . Chung) 한국축산학회 1993 한국축산학회지 Vol.35 No.6

In order to develop a new chemical castration method in pigs, the effects of intratesticular injection of the various volumes and concentrations of AgNO₃ solution with or without lactic acid on the testicular atropy and their effects on body growth, body temperature and blood siver content were determined. The effects of castration on the daily gain of body weight and backfat thickness were also determined. These chemical solutions were injected to testes of a total of 32 suckling pigs. The results obtained were as follows. The size of scrotal testis was significantly (p$lt;0.05) increased by swelling up to 4 days and then decreased from 5 days after intratesticular injection of 1 or 2 ㎖ of 0.1, 0.5, 1.0 or 5.0% AgNO₃ solution with or without 88 part of lactic acid. The testes were fully atropied at 14 and 21 days after intratesticular injection of 1 or 2 ㎖ of 5% AgNO₃ solution without and with 88 part of lactic acid. However. The testes were not successfully atropied after intratesticular injection of 1 or 2 ㎖ of 0.1 or 0.5% AgNO₃ or 1 ㎖ of 1.0% AgNO₃ solution. These results were reconfirmed by autopsy at 170 days of age. Compared with the data of controls, there were no significant (p$gt;0.05) differences in the growth rate and body temperatures of pigs up to 21 days after intratesticular injection of 1 or 2 ㎖ of 0.1, 0.5, 1.0 or 5.0% AgNO₃ solutions with or without 88 part of lactic acid. There was found no increase in serum silver content at 170 days of age. The daily gain of body weight of pigs for the period from AgNO₃ treatment to 170 days of age was not significantly (p$gt;0.05) different between 8 control boars (0.61±0.03㎏) and 12 barrows(0.61±0.04㎏). However, the backfat thickness of pigs at 170 days of age was significantly increased in barrows(2.40±0.21㎝), compard with control boars(1.96±0.09㎝).