IKUTON" 발효(醱酵) 고구마 전분박(澱粉粕)의 양돈사료(養豚飼料) 대체(代替)에 관(關)한 연구(硏究)

한성욱,정창조,Han, Sung-Wook,Chung, Chang-Cho 충남대학교 농업과학연구소 1976 Korean Journal of Agricultural Science Vol.3 No.2

IKUTON 발효(醱酵) 고구마 전분박(澱粉粕)의 농후사료대축수준(濃厚飼料代蓄水準) 調査하기 위하여 Large Yorkshire, Landrace, Duroc Jersey 삼품종(三品種) 교잡종(交雜種) 25두(頭)를 공시(供試)하여 농후사료(濃厚飼料)를 급여(給與)한 대조구(對照區)와 IKUTON 발효(醱酵) 고구마 전분박(澱粉粕) 10%, 20%, 30% 및 40%를 대치한 5개처리구(個處理區)를 완전임의배치(完全任意配置)하여 시험(試驗)한 결과(結果)를 요약(要約)하면 다음과 같다. 사료섭취량(飼料攝取量)은 40% 구(區)를 제외(除外)한 기타(其他)의 각처리구(各處理區)에서는 대조구(對照區)에 비(比)하여 유의적(有意的) (P<0.05)인 차이(差異)를 인정(認定)할 수 없었으며 40% 이상(以上)의 대체수준(代替水準)에서 사료섭취량(飼料攝取量)이 감소(減少)되고 있었다. 사료효율(飼料效率)은 20% 구(區); 3.43, 30% 구(區); 3.80, 10% 구(區) 3.97, 40% 구(區); 4.20, 0% 구(區0; 4.53의 순(順)으로 대조구(對照區)에 비(比)하여 높은 사료효율(飼料效率)을 나타내고 있었다. 증체량과 80kg 도달주수(到達週數)는 10% 구(區); 12주(週), 0%구(區); 13주(週), 20% 및 30%구(區)가 14주(週)였고 40%구(區)는 15주(週)까지도 80kg에 도달(到達)치 못하고 있었으며 대조구(對照區)에 비(比)하여 64%의 증체밖에 되지 않었다. 시험사료(試驗飼料)의 소화율(消化率)은 75.2~87.5%였으며 급수율(給水率)은 사료섭취(飼料攝取) 1kg당(當) $1.95-2.01{\ell}$로 되고 있어 사료급여회수(飼料給與回數)는 소화율(消化率)과 급수율(給水率)에 아무런 영향을 주지 않었다. Study was conducted to estimate the nutritional effect of substitution levels of "IKUTON" (R) inocculate fermented sweet potato pulp for the growing-finnishing pig rations. Twenty five Large white X Landrace cross-breed (15 kg). mixed sex were used in group feeding at the substitution levels of 0, 10, 20, 30, and 40%. The results obtained were summarized as follow: Voluntary feed intake of experimental diets was lowest in 40%. No significant difference in voluntary feed intake was found in 10,20, and 30% levels except 40% P<0.05). The feed efficiency was highest in 20%; (3.43), 30%; (3.80), 10%; (3.97), control; (4.53), and 40%; (4.20) respectively. There was tendency toward increasing feed effioiency in 10,20,30% levels than control. However, the lowest feed efficiency was found in 40% level. The weeks required to gain 80 kg of live weight were 12 weeks for 10%, 13 weeks for control. 14 weeks for 20%, and 30%, but in 40% level of substitution, no 80kg live weight was found up to the end of experiment (15 weeks). Pigs in 40% level were gained live weight only 64% of control animals. The digestibility of experimental diets was 75.2-78.5%, and water intake per kg dry matter intake was $1.95-2.01{\ell}$. No significant effects of feed offer interval to the digestibility and water consumption.

Estimation of Genetic Parameters for Economic Traits and Body Conformations in Korean Native Ogol Fowl

한성욱,상병찬,김홍기,Han, Sung Wook,Sang, Byoung Chan,Kim, Hong Ki Institute of Agricultural Science 1990 Korean Journal of Agricultural Science Vol.17 No.1

본(本) 연구(硏究)는 한국재래오골계(韓國在來烏骨鷄)의 효율적(效率的)인 선발(選拔) 및 육종계획(育種計劃)을 수립하는데 필요한 유전력(遺傳力)과 유전상관(遺傳相關)을 추정(推定)하기 위하여 1987년(年) 6월(月) 18일(日)부터 1989년(年) 2월(月) 6일(日)까지 부가계(父家系) 20수(首) 모가계(母家系) 150수(首)에서 생산(生産)된 자손 450수(首)의 검정성적(檢定成績)을 분석(分析)한 것이다. 유전력(遺傳力)에 있어서 체중(體重), 난중(卵重) 및 정강이 길이의 유전력(遺傳力) 추정치(推定値)는 0.415~0.558의 범위로 다소 높은 편이었으나, 초산일령(初産日令), 산란수(産卵數) 및 흉위(胸圍)에 대한 유전력(遺傳力)은 0.301~0.334로 중등도(中等度)의 추정치(推定値)이었다. 유전상관(遺傳相關)에 있어서는 체중(體重)과 산란수간(産卵數間)에 -0.552~-0.309로 부(負)의 계수(係數)이었으나, 체중(體重)과 난중간(卵重間)에는 0.285~0.380으로 다소 낮은 정(正)의 계수(係數)이었고, 산란수(産卵數)와 난중간(卵重間)에는 -0.383~-0.381의 부(負)의 계수(係數)로 추정(推定)되었다. 한편, 정강이 길이와 체중(體重) 및 초산일령간의(初産日令間) 유전상관(遺傳相關)은 0.328~0.843의 다소 높은 정(正)의 계수(係數)로 정강이 길이의 개량(改良)은 체중(體重)과 초산일령(初産日令)을 자동적으로 증대(增大) 시킬 수 있을 것으로 사료(思料)되었다. This study was conducted to estimate heritabilities and genetic correlations of economic traits and body conformations in Korean Native Ogol fowl. The data analyzed were the record of 450 pullets bred from 150 dams and 20 sires of the fowl obtained from June 18, 1987 to February 6, 1989. The results of this study were summarized as follows ; The estimates of heritability for body weight, egg weight and shank length from combined variance components were relatively high, ranging from 0.415 to 0.558, while those for age at first egg, egg production and breast width were moderate, ranging from 0.301 to 0.334. For genetic correlations, body weights were negatively correlated with egg production, ranging from -0.552 to -0.309, while positive correlations were found between body weight and egg weight, ranging from 0.285 to 0.380. Also, egg production was negatively correlated with egg weight, ranging from -0.383 to -0.381. The shank length showed very high positive correlations with the body weights and age at 1st egg, ranging from 0.328 to 0.843. Hence the improvement in shank length will increase the body weight as well as the age at 1st egg.

난용종계의 란중증대성과 기지 형질의 유전력 및 상관관계에 관한 연구

한성욱,오봉국 ( Seung W . Han,Bong Kug Ohh ) 한국축산학회 1975 한국축산학회지 Vol.17 No.1

The present study was conducted to estimate the heritabilities and genetic correlations. among the egg weight increase in pullet year and certain other economic traits of egg production stocks and to obtain information useful for the genetic improvement of Korean laying stocks especially for the improvement of egg weight. The data used in this study were the records on 3,121 White Leghorn hens from three different strains, LD, LH ana DS which were raised from 1964 to 1968 at Han Hyup Poultry Breeding Farm in Seoul. The traits studied were average weight of first ten eggs, average egg weight to 400 days of age, average March egg weight, body weight at 8 weeks of age, number of eggs. to 300 days of age, number of eggs to 400 days of age, age at first egg, age at average egg weight, time interval from first egg to average egg weight, and winter pause. The results obtained are as follows. 1. In the averages of each traits computed for each strain, the average weight of first ten eggs was 42.5±5.2g for the DS strain, 42.4±4.8g for the LD strain, and 43.9±5.4g for the LH strain, respectively; the average egg weight to 400 days of age and that in March were 50.3 and 53.9g for the DS strain, 51.3 and 54.5g for the LB strain, and 52.7 and 55.8g for the LH strain; body weights at 8 weeks for the DS, LD and LH strains were 580.2, 595.6 and 606.3g, respectively; numbers of eggs to 300 and 400 days of age were 72 and 138 for the DS strain, 72 and 141 for the LD strain, and 65 and 132 for the LH strain; age at first egg was 179 days for the DS strain, 181 days for the LD strain, and 186 days for the LH strain, respectively; age at average egg weight in pullet year was 260 days for the DS strain, 261 days for the LD strain, and 265 days for the LH strain; time intervals from first egg to average egg weight were 81 days for the DS strain, 73 days for the LD strain, and 79 days fer the LH strain. The range of winter pause for the three strains was 13∼23 days. 2. The range of heritability estimates derived from the sire component of variance in the three strains were 0.20∼0.45 for average weight of first ten eggs, 0.15∼0.89 for March egg weight, 0.15∼0.66 for egg weight at 400 days of age, 0.24∼0.64 for body weight at 8 weeks, 0.10∼0.14 for number of eggs to 300 days, 0.09∼0.21 for number of eggs to 400 days, 0.13∼0.44 for age at first egg, -0.11∼0.10 for age at average egg weight, 0.14∼0.18 for time interval from first egg to average egg weight, and -0.07∼0.00 for winter pause. The heritabilities of age at average egg weight were very low and those of time interval from first egg to average egg weight were of intermediate value, suggesting that the latter trait would be more useful for the improvement of egg weight increase than age at average egg weight. 3. Positive values of maternal variance were estimated in all three strains for number of eggs to 300 days of age, number of eggs to 400 days of age, age at average egg weight, and for winter pause, although the magnitude of them were somewhat different depending on the strain. For egg weight, the maternal variance was consistantly recognized only in the DS strain. 4. The genetic correlation of average weight of first 10 eggs with number of eggs to 300 and 400 days of age was -0.48∼-0.59 and -0.39∼-0.76, respectively. The genetic correlation of the trait with average egg weights to 400 days of age and with average March egg weight was 0.23∼0.93 and 0.44∼0.85, respectively. The correlations between average of first 10 eggs and 8 weeks body weight were generally positive, but were very low. The genetic and phenotypic correlations of age at first egg with number of eggs to 300 days of age were -0.48∼-0.84. The phenotypic correlations of age at first egg with number of eggs to 400 days were negative and high. But there were considerable differences between the strains in the genetic correlations of the trait with number of eggs to 400 days of age. The genetic correlation

돈의 산자수 , 이유두수 및 동복자 이유시 총체중에 대한 환경과 품종의 효과

한성욱,김창근 ( S . W . Han,C . K . Kim ) 한국축산학회 1979 한국축산학회지 Vol.21 No.1

This study was conducted to determine the effects of farrowing year, season and number, and mating system on litter size at birth, pig number and total litter weight at weaning in swine. The least square means were estimated on the basis of data obtained from 3,414 litters of Land-race, Large White and their crosses raised at St. Isidore Farm from 1972 to 1977. The results obtained are as follows: 1. The effect of farrowing year on litter size at birth and pig number at weaning was significant at 5% level and there was highly significant difference at 1% level for total litter weight at weaning. 2. The effect of farrowing season was nonsignificant for pig number and total titter weight at weaning except litter size at birth The litter size at birth was largest in fa1l. 3. The litter size at birth was smallest for the 1st parity, but the effects of over 2nd parity were nonsignificant The effects of parity for pig number and total titter weight at weaning 4. The litter size at birth and pig number at weaning from Landrace dams were larger than those from Large White dams. However, the total litter weight at weaning from Large White dams was heavier than that from Landrace dams.

육우의 생시체중에 대한 품종의 효과

한성욱,박영일,김영호 ( S . W . Han,Y . I . Park,Y . H . Kim ) 한국축산학회 1978 한국축산학회지 Vol.20 No.5

This study was conducted to determine the effects of sex, year of birth, season of birth, and the effects of breed or breed cross on birth weight in beef cattle. The data used in this study were obtained from a total of 1020 calves born at Chedong Farm in Cheju Island from 1974 through 1977. The Augus, Charolais and Hereford and their crosses were used, and the data were analysed by least squares method. The results obtained are as follows. 1. The birth weight of male calves was heavier than that of female calves by about 1.0 ㎏. 2. The effect of year of birth was statistically significant at 1% level. The birth weight of calves was lightest in 1974 when the Farm was in the first year after being established, and was heaviest in 1976. 3. The calves that were born in the spring had the heaviest birth weight, and those born in the fall had the lightest birth weight. 4. The Charolais had the heaviest birth weight of the three purebreds, being heavier than the Hereford by 0.4㎏, and the Angus had the lightest birth weight. Of the three crossbreds compared, the Charolais-Hereford cross had the heaviest birth weight, being heavier than the Hereford by 1.6㎏.

4-Methoxyaniline으로 부터 7-Hydroxy-2-aminophenazine-5, 10-dioxide의 합성과 항균성

한성욱 대구보건대학 1991 대구보건대학 論文集 Vol.12 No.-

7-Hydroxy-2-aminophenazine-5,10-dioxide was synthesized from 4-aminophenol and 6-hydroxiben-zofuroxan was previously obtained through various reaction steps starting from 4-methoxyaniline. All the intermediates and final product were purified by way of recrystallization, and extraction, and were identified by using IR and NMR spectrophotometer. Amtimicrobial activity of phenazine dioxide derivative was also determined for some Gram positive and negative bacteria. It was observed that 7-hydroxy-2-aminophenazine-5 10-dioxide was stronger antimicrobial activity against both Gram positive and negative microbes than phenazine dioxides bearing methoxy, methyl, hydrogen, acetyl and nitro groups. From the result of this study, it might be concluded that electron density of the oxygen on N→O bond.

Angus, Hereford, Charolais종(種)과 그 교잡종(交雜種)의 생시체중(生時體重)에 미치는 환경요인(環境要因)의 영향(影響)

한성욱,Han, Sung-wook 충남대학교 농업과학연구소 1977 Korean Journal of Agricultural Science Vol.4 No.2

This study was conducted from 1974 to 1977 at Chedong Animal Farm in Che-Ju to determine the effect of sex of calves, birth year and season, breeds and crossing methods on the birth weight of cattle. A total of 1020 calves from Angus, Charolais, Hereford breeds and their crossbred were used for the study and least square methods was applied to analysis the data. Birth weight of male calves was 1kg heavier than that of female. Highly significant differences were obtained in the effects of birthyear on the birth weight, i.e. the cattle born in 1976 and 1977 was 0.9 and 0.2kg heavier in birth weight than those born in 1975. The cattle born in 1974, when the farm was established, was 1.7kg lighter than those in 1975. The calves born in the spring and the summer was 0.6 and 0.3kg heavier in birth weight than those born in the winter. The calves born in the fall was 0.9kg lighter than the calves born in the winter. In birth weight, Charolais breed were 0.4kg heavier than those from Hereford breed. Angus breed were 1.1kg lighter than Hereford. The crossbred between Charolais and Hereford breed were 1.5kg heavier than the Hereford. The birth weight of calves from Angus and Hereford crossbred and Angus and Charolais crossbred were 0.6 and 0.4kg lighter, than Hereford breed respectively. 본(本) 연구(硏究)는 1974년(年)부터 1977년(年)까지 4개년간(個年間)에 걸쳐 제주도(濟州道) 소재(所在) 제동목장(濟東牧場)에서 사육(飼育)된 Angus, Charolais, Hereford종(種)과 그들 교잡종(交雜種) 총(總) 1020두(頭)에 대한 자료(資料)를 최소자승법(最小自乘法)을 통(通)해 통계분석(統計分析)하여 자우(仔牛)의 성(性), 출생년도(出生年度), 출생계절(出生季節), 품종(品種) 및 교배방법(交配方法)등이 자우(仔牛)의 생시체중(生時體重)에 미치는 영향을 추정(推定)하였다. 1. 생시체중(生時體重)에 대한 성(性)의 효과(效果)는 숫송아지가 암송아지 보다 1kg 더 무거웠다. 2. 출생년도(出生年度)의 효과는 1%수준(水準)에서 유의성(有意性)이 인정(認定)되었으며 '76, '77년도(年度)의 생시체중(生時體重)이 '75년도(年度)보다 0.9kg 0.2kg 더 무거웠고 목장개설(牧場開設) 초년도(初年度)인 '74년도(年度)는 '75년도(年度)보다 1.7kg 가벼웠다. 3. 출생계절(出生季節)의 효과(效果)는 봄과 여름에 출생(出生)된 송아지가 겨울에 출생(出生)된 송아지보다 0.6, 0.3kg무거웠으며 가을에 출생(出生)된 송아지는 0.9kg 가벼웠다. 4. 품종(品種)과 교배방법(交配方法)의 효과는 Charolais 종(種)이 Hereford종(種)보다 0.4kg무거웠으며 Angus종(種)은 1.1kg가벼웠다 Charolais종(種)과 Hereford종(種)의 교잡종(交雜種)은 Hereford종(種)보다 1.5kg 무거웠고 Angus와 Hereford 교잡종(交雜種), Angus와 Charolais교잡종(交雜種)은 Hereford종(種)보다 각각(各各) 0.6, 0.4kg 가벼웠다.

제주도 새마을 기술봉사단편-폐사직전의 양돈장을 재건

한성욱,Han, Seong-Uk 한국과학기술단체총연합회 1976 과학과 기술 Vol.9 No.1

돼지의 이유전체중(離乳前體重)과 이유후형질(離乳後形質)에 대한 유전력(遺傳力)과 유전상관(遺傳相關)의 추정(推定)

한성욱,상병찬,이한옥,Han, Sung Wook,Sang, Byung Chan,Lee, Han Ok 충남대학교 농업과학연구소 1987 Korean Journal of Agricultural Science Vol.14 No.1

본(本) 연구(硏究)는 1978년(年)부터 1983년(年)까지 국립종축원(國立種畜院)에서 사육(飼育)된 Landrace, Hampshire, Large Yorkshire 및 Duroc 종(種) 54 두(頭)의 종모돈(種牡豚)에서 생산(生産)된 253 두(頭)의 웅돈(雄豚)의 검정자료(檢定資料)를 이용(利用)하여 이유전(離乳前) 체중(體重)과 이유후(離乳後) 형질(形質)에 대한 유전력(遺傳力)과 유전상관(遺傳相關) 및 표현형상관(表現型相關)을 추정(推定)하였던바 그 결과(結果)를 요약(要約)하면 다음과 같다. 1. 유전력(遺傳力) 추정치에 있어서는 이유전체중(離乳前體重)인 생시체중(生時體重), 21 일령체중(日齡體重) 및 56 일령체중(日齡體重)에서 각각(各各) $0.233{\pm}0.160$, $0.485{\pm}0.185$ 및 $0.758{\pm}0.214$이었으며, 이유후체중(離乳後體重)인 일당증체량(日當增體量), 사과요구율(飼科要求率), 등지방(脂肪)두께, 90 kg 도달일령(到達日齡) 및 선발지수(選拔指數)에서 각각(各各) $0.270{\pm}0.164$, $0.350{\pm}0.174$, $0.272{\pm}0.165$, $0.887{\pm}0.221$ 및 $0.565{\pm}0.195$이었다. 2. 유전상관(遺傳相關) 추정치(推定値)에 있어서는 생시체중(生時體重)과 21 일령체중(日齡體重) 및 56 일령체중간(日齡體重間)에 각각(各各) 0.349 및 0.198 이었으며, 21 일령체중(日齡體重)과 56 일령체중간(日齡體重間)에는 0.907이었고, 일당증체중(日當增體重)과 사료요구율(飼料要求率), 등지방층(脂肪層)두께, 90 kg 도달일령(到達日齡) 및 선발지수간(選拔指數間)의 유전상관(遺傳相關) 각각(各各) -0.552, 0.107, -0.903 및 0.71 이었으며, 사료요구율(飼料要求率)과 등지방층(脂肪層)두께, 90 kg 도달일령(到達日齡) 및 선발지수간(選拔指數間)의 유전상관(遺傳相關)은 각각(各各) -0.058, 0.699 및 -0.942이었고, 등지방층(脂肪層)두께와 90 kg 도달일령(到達日齡) 및 선발지수간(選拔指數間)의 유전상관(遺傳相關)은 각각(各各) -0.237, -0.025 이었다. 3. 표현형상관(表現型相關) 추정치(推定値)에 있어서는 생시체중(生時體重)과 21 일령체중(日齡體重) 및 56 일령체중간(日齡體重間)에 각각(各各) 0.341, 0.287이었고, 21 일령체중(日齡體重)과 56 일령체중간(日齡體重間)에는 0.893이었으며, 일당증체량(日當增體量)과 사료요구율(飼料要求率), 등지방층(脂肪層)두께, 90 kg 도달일령(到達日齡) 및 선발지수간(選拔指數間)의 표현형상관(表現型相關) 각각(各各) -0.062, 0.093, -0.651 및 0.540이었고, 사료요구율(飼料要求率)과 등지방층(脂肪層)두께, 90 kg 도달일령(到達日齡) 및 선발지수간(選拔指數間)의 표현형상관(表現型相關)은 각각(各各) 0.105, 0.601 및 -0.613이었으며, 등지방층(脂肪層)두께와 90 kg 도달일령(到達日齡) 및 선발지수간(選拔指數間)의 표현형상관(表現型相關) 각각(各各) -0.040, -0.416 이었다. The study was conducted to estimate the heritabilities, genetic and phenotypic correlations on preweaning body weight and postweaning traits. The data analysis were the record of 253 male pigs produced from 54 boars of Landrace, Hampshire, Large Yorkshire and Duroc purebreds raised at National Animal Breeding Institute from 1978 to 1983. The results obtained in this study are summarized as follows. 1. The heritabilities of body weight at birth, 21days and 56days were $0.233{\pm}0.160$, $0.485{\pm}0.185$ and $0.758{\pm}0.214$, respectively, and the heritabilities estimated on postweaning traits were $0.270{\pm}0.164$ for average daily gain, $0.350{\pm}0.174$ for feed requirement, $0.272{\pm}0.165$ for backfat thickness, $0.887{\pm}0.221$ for days to 90Kg and $0.565{\pm}0.195$ for selection index. 2. Genetic correlations of body weight at birth with 21 days and 56 days were 0.349 and 0.19& and body weight at 21 days with 56 days was 0.907, and daily gain with feed requirement, backfat thickness, days to 90 Kg and selection index were -0.552, 0.107, -0.903 and 0.716, and feed requirement with backfat thickness, days to 90Kg and selection index were -0.058, 0.699 and -0.942, and backfat thickness with days to 90 Kg and selection index were -0.237 and -0.025, respectively. 3. Phenotypic correlations of body weight at birth with 21 days and 56 days were 0.342 and 0.287, and body weight at 21 days with 56 days was 0.893 and daily gain with feed requirement, backfat thickness, days to 90Kg and selection index were -0.062, 0.093, -0.651 and 0.540, and feed requirement with backfat thickness, days to 90Kg and selection index were 0.105, 0.601 and -0.613, and backfat thickness with days to 90Kg and selection index were -0.040, -0.416, respectively.

돼지의 이유전체중(離乳前體重)과 이유후형질(離乳後形質)에 대한 품종(品種)과 환경(環境)의 효과(效果)

한성욱,상병찬,이한옥,Han, Sung Wook,Sang, Byung Chan,Lee, Han Ok 충남대학교 농업과학연구소 1987 Korean Journal of Agricultural Science Vol.14 No.1

본(本) 연구(硏究)에서는 1978년(年)부터 1983년(年)까지 국립종축원(國立種畜院)에서 사육(飼育)된 Landrace, Hampshire, Large Yorkshire 및 Duroc 종(種) 54 두(頭)의 종모돈(種牡豚)에서 생산(生産)된 253 두(頭)의 웅돈(雄豚)의 자료(資料)를 이용(利用)하여 이유전체중(離乳前體重)과 이유후형질(離乳後形質)에 대한 품종(品種), 종모돈(種牡豚), 산차(産次), 년도(年度) 및 분만월(分娩月)이 미치는 효과(效果)를 추정(推定)하였던바 그 결과(結果)를 요약(要約)하면 다음과 같다. 1. 이유전체중(離乳前體重)에 대한 품종(品種)의 효과(效果)는 생시체중(生時體重), 21 일령체중(日齡體重) 및 56 일령체중(日齡體重)에서 고도(高度)의 유의적(有意的)(P<.01)인 차이(差異)가 있었으며, 산차(産次)의 효과(效果)는 56 일령체중(日齡體重)에서만 고도(高度) 유의적(有意的)(P<.01)인 차이(差異)가 있었다. 2. 이유전체중(離乳前體重)에서 품종별(品種別)로는 생시체중(生時體重)에서 Duroc 종(種)이 $1.593{\pm}0.001kg$로 가장 무거웠고, 21 일령(日齡) 및 56 일령체중(日齡體重)에서는 Landrace 종(種)이 각각(各各) $6.227{\pm}0.199$ 및 $18.590{\pm}0.493kg$로 가장 우수하였다. 3. 이유후형질(離乳後形質)에 대한 품종(品種)의 효과(效果)는 일당증체량(日當增體量), 사료요구율(飼料要求率), 등지방두께 및 90 kg 도달일령(到達日齡)에서 고도(高度)의 유의적(有意的)(P<0.01)인 차이(差異)가 있었으며, 산차(産次)의 효과(效果)에서는 등지방두께에서만 유의적(有意的)(P<.05)인 차이(差異)가 인정(認定)되었다. 4. 이유후형질(離乳後形質)에 있어서 품종별(品種別)로는 일당증체량(日當增體量) 및 사료요구율(飼料要求率)에서 Duroc 종(種)이 각각(各各) $876.279{\pm}8.198g$ 및 $2.754{\pm}0.198$로 가장 우수하였고, 등지방두께는 Hampshire 종(種)이 $1.969{\pm}0.198cm$로 가장 우수하였다. The study was conducted to determine the main effects of breed, sire, parity, farrowing year and month on preweaning body weight and postweaning traits. The data analysis were the record of 253 male pigs produced from 54 boars of Landrace, Hampshire, Large Yorkshire and Duroc purebreds at National Animal Breeding Institute from 1978 to 1983. The results obtained in this study are summarized as follows. 1. The effect of breed on preweaning body weight was highly significant at 1% level for body weight at birth, 21 days and 56days, and effect of parity was highly significant at 1% level for body weight at 56 days. 2. On preweaning body weight by breed, Duroc was superior with $1.593{\pm}0.001Kg$ for body weight at birth, and Landrace was superior with $6.227{\pm}0.199$ and $18.590{\pm}0.493Kg$ for body weight at 21 days and 56 days, respectively. 3. The effect of breed on postweaning traits were highly signicant at 1% level for average daily gain, feed efficiency, backfat thickness and days to 90Kg, and the effect of parity was significant at 5% level for backfat thickness. 4. On postweaning traits by breed, Duroc was superior with $876.275{\pm}8.198g$ and $2.754{\pm}0.198$ for average daily gain and feed efficiency, respectively, and Hampshire was thin with $1.969{\pm}0.198$ em for backfat thickness.