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RISS 인기검색어
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- 저자 : 여정수(Jung S. Yeo) (검색결과 3 건)
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여정수(J . S . Yeo),정일정(I . C . Cheong),정경진(K . J . Chung),정선부(S . B . Chung),정연후(Y . H . Jung),이기복(K . B . Lee),설동섭(D . S . Sul),오봉국(B . K . Ohh) 한국축산학회 1990 한국축산학회지 Vol.32 No.9
Through chromosomal analysis of 109 heads of the Korean Native Cattles, this research was observed results as follows; 1. Six heads(5.5%) were cosisted of two kinds of mosaic chromosomal spreads( I : monosomy, normal and trisomy II: monosony and normal) and these mosaicsms were variated at #29 chromosome. 2. One head was showed supernumery chromosome suggested B-chromosome. 3. 1/29 Robertsonian translocation was not found in the Korean Native Cattles.
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金載弘,吳鳳國,鄭槿基,閔炳烈,呂政秀 서울大學校 農科大學 1982 서울대농학연구지 Vol.7 No.2
1. The primary purpose of this study was to analyze the current status of broiler operations in Korea related to management practices and input and output relationship in broiler production by surveying 150 broiler producers throughout the country. Based on this primary information, this study attempted to illustrate a model of broiler farming budget. 2. The average size of the broiler operation included in this survey was 27,376 birds produced per farm during the period from September Ⅰ, 1980 to August 31, 1981. However, around 70% of the produces with the broiler farming with less thatn 20,000 birds produced annually or less than \5 million during the late half of 1960's and the early half of 1970's. About 83% of the farmers were graduates from high school or college. These broiler produced listed that the capital shortage and poor production and management skills are the most important problems in the operation. 3. The farmers used to purchase baby chicks from the well known hatcheries and commercial mixed feeds on one or two month's credit. The broilers were sold to wholesalers or assemblers. 4. On the average, every famer raised chicks 4 or 5 times a year. Approximately 42% of farmers purchase baby chicks once a week and 33% of farmers twice a month for the replacement of broiler houses. Approximately 72% of farmers practiced all in all out system for the replacement of broilers. Debeaking was practiced by a few farmers and 67% of farmers have kepa fairly reasonable records. 5. The labor used per 1,000 birds a year was 163 man hours on the average, which means one man alone can namage approxomately 20,000 birds of broilers in a year. Total of 163 hours, 40% or 64.5 hours was allocated for general management, 42% for feeding and watering, 18% for cleaning, waste management and forwarding. 6. The average size of housing unit was 25 pyung which can accommodate 1,000~1,250 birds of broilers, and most of the house were built a simple frame vinyle house. 7. Underground water has been the major source of water supply to the birds on the most of the operations, however, the quality of the water has never been tested yet. CRD, Marek's disease, Lucocytozoon and Newcastle disease occurred very frequently at the broiler operation. 8. The average cost for raising a broiler was \7,889 per 10kg of live weight during the study period, and the cost was significantly decreased as the size of operation increased. It was required about 8 weeks of age the broiler reaches 2.0kg of body weight. 9. The production cost was constituted of 64.6% feed cost, 17.5% of chick cost, 8.7% of labor cost and 9.2% of other cost items in total. The rate of body weight gain and the rate of feed requirement were considered as the most important factors affecting the cost of broiler production. 10. Income to the management and owned labor and capital per 10kg of broiler live weight was \1,447 on the average, but varied significantly as the size of operation changed. For example, the income per 10kg of broiler weight was \1,423 for the farmers with 10,000~20,000 birds, while that was \1,552 for the farmers with 20,000~50,000 birds or more. 11. It is recommanded that an increase in broiler production efficiencies should be achieved through the introduction of modern facilities and equipment, expansion of flock size and adaptation of advanced management practices such as high potential chicks, all in-all out management system and the scientific disease prevention programs. The goals for the rate of body weight gain should be 2.0kg or more body weight at 8 weeks of age, the feed requirement 2.0kg per kilogram of body gain and the mortality less thatn 4% for 8 weeks of age. 12. based on the results of this survey and the recommendations made above, two model budgets were developed for the 25,000 birds operation and the 50,000 birds operation in a year, respectively. The difference in broiler production costs was \100 per 10kg of body weight in favour of the large operation. It was true because the large scale operation needed relatively small amount of land and capital per bird.
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産卵鷄에 있어서 營養水準과 系統間의 相互作用에 關한 硏究
吳鳳國,崔光洙,呂政秀 서울大學校 農科大學 1979 서울대농학연구지 Vol.4 No.1
To investigate the interaction between breeds and feed regimes, 1800 experimental layers of the commercial egg laying strains under two nutrition levels were fed during laying period(22∼72 weeks of age). The results of laying performances of two regimes and ten commercial strains seem to be interpreted as followed. In viability there were no significant differences between nutrition levels but strains No. 2, 4, 6 were significantly superior in high nutrition level and strain No. 8 was superior in medium level in significant interaction in term of variance between strains and feed regimes. Egg production over three phases did not indicate significant differences between feed regimes but was significant among strains identifying No. 1, 2, 3, 4 as superior strains. Especially this study researched that high nutrition level influnced strongly in phase Ⅰ(22∼38 weeks of age), and in phase Ⅲ(56∼72 age of age) significant interaction identified as superior stocks No. 2 strain under high feed regime and No. 3, 5 strains under medium regime. As above result in egg production during first phase, early egg weight(22∼38 weeks of age) was significantly influenced by high nutrition level but average egg weight during all laying period was not significantly different between feed regimes and interaction between breeds and feed regimes. According to increase protein and energy level it was evident that feed efficiency was improved in all layer strains, but also this experiment could be deduced that egg production as well as feed requirement influenced feed efficiency.
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