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자돈 (仔豚) 의 근친도 (近親度) 가 이유전 (離乳前) 형질과 이유후 형질에 미치는 영향
안병석(Byeong Seog Ahn),김내수(Nae Soo Kim),강만석(Man Seok Kang),박태진(Tae Jin Park) 한국축산학회 1989 한국축산학회지 Vol.31 No.9
This study was undertaken to determine the effects of inbreeding, years, seasons, breeds and dam`s parities on pre- and post-weaning traits of litters. The data for this study were obtained from 187 heads of Landrace, Hampshire, Yorkshire and Duroc purebreds which were tested from 1980 to 1984 at National Animal Breeding Institute. The results obtained in this study are summarized as follows ; 1. Litter size and pig weight were significantly affected by year, breed, dam`s parity(p $lt;0.01), but were not affected by inbreeding. 2. Daily gain, feed efficiency, backfat thickness, days to 90 kilogram and selection index were affected by year and breed(p $lt;0.01) and backfat thickness was affected by dam`s parity(p $lt;0.01), but inbreeding didn`t affect above all traits. 3. Regression coefficients on pre-and post-weaning traits, that is, litter size, pig weight at birth, pig weight at 21 day, daily gain, feed efficiency, backfat thickness, days to 90 kilogram and selection index were -0.064, -0.002, -0.005, -0.049, 0.001, 0.003, 0.012, -0.136, respectively.
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姜萬石 대구효성가톨릭대학교 1978 연구논문집 Vol.20 No.1
In this paper, I treat of the distribution of vegetation division by records of monthly mean temperature and monthly average precipitation from 1931 to 1960 in Korea, and explain climatic characteristics of vegetation regions which are composed of woody plant and herbaceous plant. the results of the analysis may be summarized as follows: (1) The vegetation zone of woody plant and herbaceous plant are divided into three types by three climatic regions. That zone of herbaceous plant is divided into six types based on the method of Klima-diagramm. (2) The forest zone is classified according to temperature and amount of precipitation. The approximate boundary line between the evergreen needle-leaved forest region and the deciduous brad-leaved forest region is decided by warmth index 85, precipitaiton effectiveness ratio 60, and potential evapotranspiration 650. And the demarcation between the deciduous broad-leaved forest region and the evergreen broad-leaved forest region is fixed on warmth index 110, continentality 58, and oceanity 13. (3) According to temperature of 0.5℃ and 1.0℃ in the type of the hotest month, the herbaceous plant is classified into the continental type (Forage type, Sasamorpha type), the transitional type (Miscanthus type, Pteridium type), and the maritime type (Zoysia type, Phragmites type). While, in case of setting up continentality 67 and 55 as a criterion of classifying grasslands, there are appeared some differences in location. (4) The grassland region based on temperature and precipitation are divided into six homoclimatic types which show N-S direction in southern are and E-W direction in northern are. The regional arrangement of three grassland types caused by temperature appears N-S direction in the whole country. (5) In the climatic characteristics of the vegetation zone, the frigid zone is cool in summer and severe in winter, and is belonged to the cold temperate climate within the annual range of temperature of being between 35℃ and 44℃. The amount of precipitation in this zone is between 500mm and 950mm. The temperate zone which has hat summer and comparatively cold winter is compounded the warm temperate climatic region and the cold temperate climatic region. Annual precipitation reached between 950mm and 1300mm is more than that of the frigid zone. The subtropical zone has hot summer and mild winter as a maritime climatic region, so the annual range of temperature becomes the smallest. Since it precipitates normally between 1300mm and 1800mm in a year, this zone forms the heaviest rainfall area.
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