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한우의 번식이 조해되는 요인의 분석연구 ( 강원지역을 중심으로 ) 제1보 빈우의 초산령과 성빈우의 분만간격 및 불임우의발생이 소번식에 미치는 영향
이영철,리해종 ( Y . C . Rhee,H . J . Rhee ) 한국축산학회 1974 한국축산학회지 Vol.16 No.3
This study was an attempt to establish the basic materials for the first parturition age. the parturition interval, ana the sterility, in relation to the factors control lng the increase of the Korean cattle in order to improve the fertilization rate and to supply the meat which is needed in large amount as the result of national income elevation. The results of analyses on the prerequisite of reproductive failure of Korean native cattle were as follow; 1. The fertilization talc of Korean cattle was higher in love land area than in up-land. 2. The fertilization rate of Korean cattle was varied according to its delay of first parturition age, relative length of parturition interval of adult cow and its occurrence frequency of sterile cattle. 3. among the basic factors which decrease breeding ability of Korean cattle, the first was the delay of first parturition, the second was the extension of parturition interval and the third was the state of sterile cattle. 4. The fertilization rate of Korean cattle decreased as the feeding period was longer and such phenomena occurred more markedly in up-land area than in low land. Parturition interval of calving time in feeding period was longer in up-land area than in low land in general and the variation of parturition interval showed similar trend.
닭에 있어서 계분의 사료가치에 관한 연구 ( 제1보 )
이영철,홍병주,강창기 ( Y . C . Rhee,B . J . Hong,C . G . Gang ) 한국축산학회 1974 한국축산학회지 Vol.16 No.3
Two experiments were carried out to determine the chemical composition of dehydrated poultry waste(D.P.W) according to its collecting time after excretion and to determine the nutritive value of D.P.W. as a feed of laying hen. The results were summarized as follows: 1. Protein content of D.P.W. is gradually decreased as the time passes after excretion, the excreta collected within 24 hour showed 31.02% of protein, and the one within 48 hour shoved 16.60%. There was a wide variation in the amount of non-protein nitrogen(NPN), while the true protein is fairly constant. Above 50% of the nitrogen in D.P.W. occurs in the form of NPN. 2. The nitrogen content of D.P.W. was not affected by the dietary protein level, but seemed to be influences significantly by the age of chicken. The highest nitrogen value was obtained from laying hen, although their dietary nitrogen was lower than that of growing chick. 3. 10% D.P.W-A ration showed highest egg production among the treatments and feed efficiency was substantially reduced when 20% of the D.P.W-B was included in the ration which reflected its low metabolizable energy value. The result of this experiment demonstrates that the inclusion of 10% D.P.W. did not interfere with the egg production. 4. There were no differences in egg weight, shell thickness and haugh unit among the treatments. This result proves that the inclusion of D.P.W. did not interfere with egg quality.
간이 ( 簡易 )처리에 의한 우모분이 병아리 성장에 미치는 영향 ( 제1보 )
이영철 ( Y C Rhee ) 한국축산학회 1970 한국축산학회지 Vol.12 No.3
Nutritional values, of under-processed feather meal as a practical chicken feed were studied. When feather was steamed heated at 25 p.s.i. for 30 rain., 60 min., 90 min. and 120 min. respectively, Pepsin- Hcl digestibility was improved gradually and the bulk density was appeared to be increased as the processing increased. The 10% feather meal diet by the replacement of fish meal and soybean oil meal was inferior to corn-soy type control diet. However, 5% feather meal diet proved to be a satisfactory substitute for some portion of soybean oil meal. It is suggested that feather meal processed at 25 p.s.i. may be made available as adquately as the ordinary processed once, if they were autoclaved more than two hours.
이영철 ( Y C Rhee ),홍병주 ( B J Hong ) 한국축산학회 1973 한국축산학회지 Vol.15 No.2
Two experiment were carried out to determine the effect of supplementing chicken diets with fish soluble as a partial substitute for the protein component. The results obtained are summarized as follows: 1. The chicken fed fish soluble diet at the level of 2%, 4% and 6% respectively increased their bony gain during the 3 weeks experimental period comparing to the corn-soy type control diet which contained 12.6% fish meal. However, chicken fed 8% fish soluble diet showed decrease in growth rate. No statistical significance among the treatments were obtained. 2. These results indicate that fish soluble up to 6% level can be used in the broiler diet satisfactorily. 3. There were no statistical difference among the treatments in feed consumption and feed efficiency. Chicken fed the 2% fish soluble diet consumed less feed than other groups, on the other hand, those fed 8% fish soluble diet consumed much more feed and showed decreased feed efficiency. 4. There were no statistical significance among the treatments in egg production, but the hens fed fish meal and/or fish soluble produced more eggs (5-7%) than those fed corn-soy type control diet. On feed consumption and feed efficiency, no statistical difference among the treatments were obtained. Hens fed fish soluble diet showed slight degree of diahhrea.
닭에 있어서 비단백태질소화합물의 이용성에 관한 연구 ( 제2보 )
이영철 ( Y C Rhee ),김정익 ( C I Kim ) 한국축산학회 1973 한국축산학회지 Vol.15 No.1
Two experiments were carried out to determine the effect of supplementing chicken diets with non-protein nitrogen as a partial substitute for the protein sources. The results obtained were summarized as follows: When diammonium citrate and urea were supplemented 2%, 4% and 6% protein equivalent in a 12% protein hen`s diet, respectively, not only all the level of DAC (diammonium citrate) supplemented diets but also that of urea diets showed a little better nitrogen absorption and retention in comparison with 16% protein control diet. From these results it appears that ammonium nitrogen in the above forms is normally absorbed by the adult hen.
홍병주,이영철 ( B . J . Hong,Y . C . Rhee ) 한국축산학회 1973 한국축산학회지 Vol.15 No.3
This experiment was conducted to compare the effects of antibiotic additives(baciferm, aurofac, SMS and terramycin 3+3) on body weight gain and some lymphoid tissues of broiler chicks. The results obtained were summarized as follows: 1. All of the antibiotic additive treatments showed higher weight gain(1.5-8%) than that of control, but the growth rate was varied according to the kind of antibiotics. 2. When antibiotics were added, the weight of adrenal, bursa of fabricius, spleen, colon and pancreas were heavier than those of antibiotic free treatment.