한국재래산양의 산지집단 사양체계 개발에 관한 연구 - 산지집단 사육과 사내 (舍內) 사육법의 비교 -

강대진(D . J . Kang),곽종형(C . H . Kwack),송준익(J . I . Song) 한국영양사료학회 1996 韓國營養飼料學會誌 Vol.20 No.1

3-D ESPI법을 이용한 단점용접부의 변형률 측정

차용훈(Y.H. Cha),강대진(D.J. Kang),장훈(H. Jang),장경천(K.C. Jang),성백섭(S.B. Sung) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.7

Currently knowledge of strain in welds has mainly been obtained from strain gaging method: that is directly attaching most of the material to the gage. The very few non-contact methods are still in the early stage. One of the non-contact methods is by the use of the laser that has high-level of the accuracy for the measurement, and this laser also has excellent characteristics on which many studies for its applications are focused throughout the many fields. A method of study is on the measurement of the strain caused by the characteristics of the spot welded zone which is used with 3-D ESPI system that is functionally modified through the laser ESPI(Electronic Speckle Pattern Interferometry) system. This system employed the SGCC 1.2t which are mainly used for the steel plate such as automobile, structure, building material and electronic appliances.

돼지의 번식형질에 대한 유전 및 환경적 효과 상호작용에 관한 연구

김철욱,강대진,박충생 ( C . H . Kim,D . J . Kang,C . S . Park ) 한국축산학회 1983 한국축산학회지 Vol.25 No.1

This study was conducted to determine the main effects and interactions of breed, furrowing season and parity on swine reproductive traits: litter size at birth and weaning, pig and litter weight at birth, 21 days and weaning on the basis of the data obtained from 1047 litters of Berkshire and Landrace born from 1976 to 1980 at Sacheon Branch, National Livestock Station. The data were analysized by the least square method and results obtained are summarized as follows: 1. Landrace was heavier by 10% in litter weight at weaning, 17% in litter weight at 21 days, 10% in litter weight at birth, 23% in pig weight at 21 days than Berkshire. 2. The effect of breed for each litter weight and pig weight at 21 days was highly significant at 1% level. 3. The effect of furrowing year was highly significant for all the traits studied without any consistent pattern as the year passed. 4. The reproductive performance of the pigs born in the spring was significantly higher (p$lt;.001) than that in the fall except for the pig weight and litter size at weaning. 5. The litter size at birth or weaning was significantly larger (.1%) in the groups of the 2nd to 6th parity than in the other groups. All the body weight traits studied were significantly (.1%) superior in the 2nd 4th, the 5th - 6th, the 7th and over, and the 1st parity in that order. 6. The pig weight at weaning in Berkshire was significantly heavier in the spring-born group. The litter size at weaning and litter weight at birth in Landrace was significantly higher in the spring-born groups than in the fall-born ones. 7. The effect of breed x parity interaction was nonsignificant for the traits studied.

면양에 있어서 성장 및 산모량에 (産毛量) 영향을 미치는 불변요인효과에 관한 연구 Ⅲ. 생시 이유시 및 18개월령 체중에 대한 불변요인효과 추정

조헌조,강대진,최광수,오대균,김영직 ( H . C . Cho,D . J . Kang,K . S . Choi,D . K . Oh,Y . J . Kim ) 한국축산학회 1989 한국축산학회지 Vol.31 No.11

The study analyzed in the study were collected from the results of performance-testing on Corriedale, Polwarth at the Nawweon Branch of the National Animal Breeding Institute from January 1981 to May 1985. Birth weights, weaning weights, body weight at the age of 18-month were analyzed; and constants and least-squars means for the traits were estimated by the least-squares methods. The results are summarized as follows: 1. Years of birth affected significantly body weights at birth, at weaning and at the age of 18-month in corriedale and Polwarth(p $lt;0.01). The constant estimates of years of birth for birth weights ranged -0.167∼0.208㎏ in corriedale and -0.113∼0.089㎏ in Polwarth, and the corresponding figures for weaning weights were estimated -1.655∼1.509㎏ and -1.983∼2.051㎏; and the estimates for body weight at the age of 18-month were -1.982∼2.746㎏ and -1.757∼1.884㎏, respectively. 2. The effects of ages of dam were significant for birth weights and weaning(p $lt;0.01), but were not influential for body weights at the ages of 18-month. The constant estimates of ages of dam ranged -0.124∼0.079㎏ for birth weights and -0.664∼0.631㎏ for weaning weights in Corriedale, and the corresponding estimates in Polwarth were -0.133∼0.086㎏ and -0.628∼0.921㎏ respectively. Lambs from above two-year-old matured ewes were heavier than those from two-year-old ewes. 3. Sex of the individual lamb greatly affected birth weights and weaning weights in Corriedale and Polwarth, but no significant differences were found between lamb sexes in birth weights in polwarth compared with the birth and weaning weights of ewe-lambs those of ram-lambs were 0.08㎏ heavier in Corriedale and 0. 06㎏ heavier in polwarth, and weaning weights of ram-lambs were 1.22㎏ heavier in corriedale and 1.02㎏ in Polwarth. 4. Types of birth had significant effects on body weighs at birth and weaning in Corriedale and Polwarth(p $lt;0.01). Singles were heavier than twins by 0.68㎏ in corriedale and 0.48㎏ in polwarth at weaning In body weights at the age of 18-months singles were superior to twins by 0.54㎏ in Corriedale and by 2.84㎏ in Polwarth, and a significant difference was detected only in polwarth

아미노산 첨가수준에 따른 산란계용 사료의 단백질 절약효과

곽종형,강대진,고영두,하정기,한인규,김성겸 ( C . H . Kwack,D . J . Kang,Y . D . Ko,J . K . Ha,In K . Han,S . K . Kim ) 한국축산학회 1981 한국축산학회지 Vol.23 No.6

To investigate the protein sparing effect of DL-methionine and L-lysin on the laying hen ration, the present experiment with a total of 288 hens (Hi-sex commercial hens) was carried out for a period of 14 weeks (23-36 weeks). In this experiment 8 treatments ((1) control, CP 16%; (2) basal, CP 14% (3)basal +L-lysine 0.1% ; (4) basal+L-lysine 0.2% ; (5) basal+DL-methionine 0.1 % ; (6) basal+DL-methionine 0.2%; (7) basal+L-lysine 0.1%+DL-methionine 0.1 %; and (8) basal+L-lysine 0.2%+DL-methionine 0.2%) were employed. Metabolism trial was conducted at the end of feeling trial. The results obtained are summarized as follows; 1. The highest egg production was obtained from the group of basal+L-lysine 0.2%+DL-methionine 0.2% and the lowest from the group of basil +L-lysine 0.2%. But no statistically significant difference was found among all the treatments. 2. The heaviest egg weight was obtained from the group of basal+L-lysine 0.2%+DL-methionine 0.2% and the lightest was obtained from basal+L-lysine 0. 1%. But no significant difference was found among all the treatments. 3 . In feed intake, significant (p$lt;0.05) differences were found among treatment groups. Higher feed consumptions were generally resulted from the groups supplemented with L-lysine and/or DL-methionine. 4. Best, feed efficiency was obtained from control group, and the worst from the group of basal+L-lysine 0.1%+DL-methionine 0.1%. But no significant difference was found among all the treatments. 5. Nutrient utilization was not affected by supplementation with L-lysine and/or DL-methionine. 6. Feed cost per Kg egg mass production was in order of basal, basal +L-lysine 0.1%, basal+L-methionine 0.1%, basal+L-lysine 0.2%+DL-methionine 0.2%, control, basal+L-lysine 0.2%, basal+L-lysine 0.1%+DLmethionine 0.1%, and basal+DL-methionine 0.2%. Therefore, based on the results of this experiment, it is concluded that supplementation of L-Lysine and DL -Methionine at the level of 0.2% respectively with the basal ration(14% protein) would be able to spare 2% dietary protein.

Silver Nitrate 용액의 정소내 주입에 의한 가토의 거세효과에 관한 연구

이은봉,박충생,강대진,윤창현 ( E . B . Lee,C . S . Park,D . J . Kang,C . H . Yun ) 한국축산학회 1985 한국축산학회지 Vol.27 No.12

This experiment was carried out to develop a chemical castration with a single intratesticular injection of silver nitrate solution in domestic rabbits. A total of 44 bucks of 4 to 5 months old were alloted at random into the following 4 groups: 9 bucks for controls, 6 bucks for 0.3㎖ injection of 1% AgNO₃, 14 bucks for 0.5㎖ injection of 1% AgNO₃ and 15 bucks for 0.5㎖ injection of 5% AgNO₃. Changes in body weight, testicular width in scrotum. weight and histology of testis at necropsy, blood cell counts and plasma levels of testosterone of the buck were measured for 4 weeks after treatment. The results obtained were summarized as follows: Compared with the controls, the body weight gain of bucks treated with AgNO₃ was not significantly (P$lt;0.05) different during the experimental period for 4 weeks. The white blood cell counts were tended to be increased slightly but insignificantly 1 day after injection of AgNO₃ and then decreased to normal level soon. There was no significant change in red blood cell counts in the bucks treated with AgNO₃. Most of the testis of bucks were swollen significantly (P$lt;0.05) by 6 to 12㎜ in the width of testis in scrotum 1 day after injection of AgNO₃, but began to decrease in sue from 3 days after treatment and to their normal size in a week. The AgNO₃ injection was not sufficient to castrate some bucks successfully. Only 60.0 to 66.7% of the bucks treated with 0.0㎖ of 1 or 5% AgNO₃ solution showed the plasma levels of testosterone of !sower than 0.1 ng/㎖ by 28 days after treatment. This result was considered to be due to the fact that not a whole but a limited part of testis was injured by the present method of injection. The weight of testis of the bucks of which plasma testosterone were less than 0.1 ng/㎖ by 7 to 28 days after treatment was not significantly(P$lt;0.05) different between the treatments or periods after treatment. This result indicates that the period of 4 weeks following treatment might be insufficient for the injured testicular tissue to be necrotized and absorbed fully. The extent of damage of testis by injection of AgNO₃ was much different by the local effect in the parts of distance from injection. The proximal portion of testis injected with AgNO₃ was fully damaged and necrotized, but a distal part of testis was not severely damaged.

면양에 있어서 성장 및 산모량에 영향을 미치는 불변요인효과에 관한 연구 2 . 생시체중 및 이유시 체중에 대한 품종간 교잡효과 및 이유시 체중에 대한 유전력 추정

조헌조(H . C . Cho),강대진(D . J . Kang),최광수(K . S . Choi),오대균(D . K . Oh),김영직(Y . J . Kim) 한국축산학회 1988 한국축산학회지 Vol.30 No.7

The data analyzed in the study were collected from the results of performance-testing on Corriedale, Polwarth, Romney Marsh and breed-crosses at the Namweon Branch of the National Animal Breeding Institute from January, 1980 to May, 1985. Theresultswere summarized as follows: 1. Mating systems affected significantly body weights at birth and weaning (P$lt;0.01). The least-squares means estimated for birth weight were. 3.72㎏ in pure bred Polwarth, 3.90Kg in Romney Marsh × Polwarth crossbred, 3.94㎏ in Pure bred Corriedale, 4.21㎏ in Romney Marsh × Corriedale crossed and 4.47㎏ in pure bred Romney Marsh; the corresponding for figures for weaning weights were 17.08㎏, 19.43㎏, 19.82㎏ and 20.97㎏, respectively. 2. Heritability estimates for weaning weight were 0.44±0.135 in corriedale and 0.41±0.204 in Polwarth.

젖소의 후산정체 예방을 위한 PGF2α 투여효과

정기화,이광원,곽대오,강대진,박충생 ( K . H . Chung,K . W . Lee,D . O . Kwack,D . J . Kang,C . S . Park ) 한국축산학회 1991 한국축산학회지 Vol.33 No.9

To investigate the effect of PGF₂α treatment on prevention of retained placenta and on subsequent reproductive performances of induced-and spontaneous-parturient cows, 151 heads of Holstein cows raised at National Animal Breeding Institute were used. The parturition was induced by injecting 20 ㎎ of dexamethasone into cows at 5 days perior to expected calving date, and to prevent retained placenta a single dose of 10 ㎎ PGF₂α was injected i.m. within 1 hour after induced-or spontaneous-calving. The cows which did not expelled their placenta until 12 hours postparturient were termed as the cow of placenta retention. The calving of cows was induced at 45.5±2.0 hours after injection of dexamethasone. PGF₂α injection after calving to the induced-calving cows resulted in a greater reduction(P$lt;0.01) of incidence of placenta retention (27.3%)than physiologycal saline injected cows (9.09%) In days to the Ist service after calving, there was no significant difference(P$lt;0.05) between spontaneous and PGF₂α treatment after induced-calving, but physiological saline injection after induced-calving cows resulted in significantly(P$lt;0.05) longer days(106.5±27.5 days) than spontaneous calving(66.5±4.1 days). A single dose of 10 ㎎ PGF₂α to 35 spontaneous-calving cows did not significantly(P$lt;0.05) preventive effect on placenta retention (25.7%) compared with physiological saline treatment.

면양에 있어서 성장 및 산모량에 영향을 미치는 불변요인 효과에 관한 연구 1 . 오모량 ( 汚毛量 ) 에 대한 불변요인 효과 및 반복력 추정

조헌조(H . C . Cho),강대진(D . J . Kang),최광수(K . S . Choi),오대균(D . K . Oh) 한국축산학회 1987 한국축산학회지 Vol.29 No.12

The study was conducted to obtain some environmental and genetic information for sheep performance-testing, selection, and making quantitative statements about other experimental result in sheep. The environmental and genetic parameters estimated in the study were effects of some factors due to permanent differences on wool production and repeatabilities for wool production in sheep. The results were summarized as follows : 1. Significant (P$lt;0.01) differences were detected for greasy wool weights among ages of ewes at shearing. The effects of years of shearing were estimated -0.41∼0.40㎏ in Corriedale and -0.48∼0.44㎏ in Polwarth. The constant estimates of ages of ewes at shearing were -0.70 ㎏ in one year, -0.20 ㎏ in two-year and 0.32∼4.40㎏ in above-two year in Corriedale and -0.95㎏ in one-year, 0.13 ㎏ in two-year and 0.40^0.42 ㎏ in above two-year in Polwarth. 2. Estimate repeatabilities for greasy wool 0.74 in Corriedale, and 0.51 in Polwarth.

우리나라 남부지방의 사슴사육 실태조사

곽종형(C . H . Kwack),강대진(D . J . Kang),안병홍(B . H . Ahn) 한국축산학회 1991 한국축산학회지 Vol.33 No.8

This survey was carried out to investigate the feeding situation of Sika deer, Red deer and Elk raised in the southern district of Korea. Herd size of deer investigated was divided into two groups of above 10 heads and below 10 heads. Questionnaire and inquiry were carried out simultaneously. The results obtained are as follows. 1. As for the educational background of deer farm owners, high school graduates were above 78% and owners averaged 8.52 years in deer farm management. 2. In the management type, 29% of owners specialized in a deer industry and 71% of owners kept deer farming as a side line. 3. Among breeds of deer raised, Sika deer(84.10%), was the principal breed and average number of deer per farm was 26.6 heads. 4. Rations for growing cattle were fed most frequently as concentrates for deer. Native grasses and leaves of trees were offered largely as roughages. During the winter season, kudzu hay, alfalfa cube and acacia leaf hay were mainly offered. 5. Male Sika deer consumed 2.02 to 2.52㎏ of feed daily and took 0.30 to 0.45㎏ of crude protein. Daily ME intake per metabolic body size ranged from 174.6 to 193.6㎉. Female Sika deer consumed 1.63 to 2.46㎏ of feed daily and took 0.24 to 0.44㎏ cf crude protein. Daily ME intake per metabolic body size ranged from 190.3 to 248.5㎉. Sika deer consumed less feed and nutrients during the winter season than during the spring, summer and autumn seasons. 6. Male Red deer consumed 3.41 to 3.91㎏ of feed daily and took 0.56 to 0.70㎏ of crude protein. Daily ME intake per metabolic body size ranged from 185 to 195㎉. Female Red deer consumed 2.78 to 3.48㎏ of feed daily and took 0.43 to 0.63㎏ of crude protein. Daily ME intake per metabolic body size ranged from 194 to 211㎉. Red deer consumed less feed and nutrients during the winter season than during the spring, summer and autumn seasons. 7. Male Elk consumed 6.41 to 8.29㎏ of feed daily and took 1.17 to 1.18㎏ of crude protein. Daily ME intake per metabolic body size ranged from 194 to 236㎉ and EIk took more energy during the winter season than during the spring, summer and autumn seasons. Female EIk consumed 7.76 to 7.77㎏ of feed daily and took 1.10 to 1.23㎏ of crude protein. Daily ME intake per metabolic body size was 254㎉. 8. About 50% of deer farms has a holding pen and diarrhea was the most frequently occurred disease. 9. The amount of velvet production from an adult deer per year was 0.88㎏ in Sika deer, 2.31㎏ in Red deer and 9.84㎏ in EIk. The amount of blood shed in case of harvesting velvet was 699㎖ in Sika deer, 1,369 ㎖ in Red deer and 2,685㎖ in Elk. According to the above results, it may be concluded that the moderate herd size for raising. deer is 40 heads for Sika deer, 20 heads for Red deer and 10 heads for EIk. Feeds used in example 1 to 12 were approximately adequate to the energy and protein requirements for deer by breeds, body weight and sex during four seasons. However, in the calcium and phosphorus contents shown in example l to 12, it needs to draw an attention that phosphorus content of ration was slightly lower than the requirement.