영양수준별 대추사료급여가 산란에 미치는 영향

오봉국,오세정,김춘수 ( Bong K . Ohh,Sae J . Oh,Chun S . Kim ) 한국축산학회 1979 한국축산학회지 Vol.21 No.5

Three Leghorn type and four brown egg type layers, 600 birds, were reared under three dietary restricted feeding systems and control during growing period (IO-20weeks of age)and also their productivities in laying period were observed from 8th June, 1977 to 1st March, 1978. Four different feeds were as follows : Control, High fiber feed containing much barley bran, Low protein feed consisting much amount of corn, and Barley (96%) feed. During rearing period this experiment was not observed significant differences among four treatments in viability but three restricted treatments showed less feed consumption and lower body gain due to lower quality of those feeds than control. And the feed requirement per unit body gain in barley treatment was observed especially low as reasonable re cult . In productivities followed by four different feeds during laying period, two restricted treatments, such as low protein and barley treatments except high fiber group, produced late their first egg, and all three restricted groups layed larger egg than control, which was indicated positive correlation between sexual maturity and egg weight. Production rate for short term until 48 weeks of age and laying intensity after peak production were greatly influenced by sexual maturity which was affected according to nutrition conditions of feed Therefore 79% and 75% of barley treatment in total production rate after peak production surpassed 7 and 3%, compared with control of white and coloured layers respectively. In this respects, this experiment found the most interested fact that restricted feed causing the change of fat tissues in growing chick could make efficient productivity, especially barley feed under Korea condition seemed to be able to increase egg production rate, lay large egg and require little feed intake All restricted layers consumed more feed and showed more body gain than control after feed restrictiction was cancelled at 20 weeks of age. The layers of barley treatment in low quality consumed 3.6g in white and 4.4g in coloured more than control in every day, being caused recover from unfavorable feed in growing. As shown above, restrict of feed quality in growing chick could meet with results of less feed consumption, higher egg production and larger egg resulted from laying intensity and delaying the first egg day contrast control. And in general tendency coloured layers seemed to be affected more variably than white in accordance with restricted treatment but 100% barley treatment of white and coloured layer during growing period were identified as the most efficient groups.

사료의 영양수준에 따른 Broiler 품종간의 능력 비교 시험

오봉국,오세정 ( Bong K . Ohh,Se J . Oh ) 한국축산학회 1978 한국축산학회지 Vol.20 No.5

This study was conducted to investigate the performance of four broiler strains (A, B, C, D) when they were fed by three different nutritional level (high protein and high energy; H.H., medium protein and medium energy; M.M., low protein and low energy; L.L., in Seoul National University, Agriculture College from 28th, October 1977 to 23rd. December 1977. It was considered that all strains were same in viability but H.H. treatment showed significantly lower viability compared with M.M. and L.L. treatments. In propotion to nutrition levels other characters; body weight, feed efficiency, and point spread: were significantly differentiated H.H., M.M., and L.L. treatment in order. There was found significantly differences in body weight, feed efficiency and point spread among broiler strains when comparison was made without consideration with respect to nutrition levels. A,C, and D strains were considered to show same ability except B strain in body weight at 8 weeks of age, and feed requirement 2.27㎏ in C strain was identified significant difference compared with A, D strains. In point spread E. strain also showed worse record than those of other strains. The most interested interaction between feed and strain in each character was nut showed significantly difference through statistical analysis, but having a precise investigation D strain was observed low viability in H. H. treatment, body weight of B, C strains did not significantly different in M.M. and H.H. treatments. In feed requirement, every strain was regarded different performance in H.H. and M.M. treatments but the same in L.L. treatment. In economic analysis of broiler production, the highest income was D strain (432 won) and C, B, A in order, and in accordance with nutrition levels H.H. treatment was the best and M.M. was; slightly superior to L.L. treatment.

돼지 성조절에 관한 연구

이용빈,오봉국,서국성,오성종,임경순 ( Yong B . Lee,Bong K . Ohh,Guk S . Suh,Sung J . Oh,Kyong S . Im ) 한국축산학회 1979 한국축산학회지 Vol.21 No.1

This study was conducted to investigate the sex ratio between the natural born pigs and B-body test sperm, which the data were obtained from a total of 1.242 pigs born at Swine Farm, Jeil Sugar Co. And it was attempted the sedimentary and galvanic separation. of X-and Y-bearing spermatozoa with 4 boar semens at College of Agriculture, Seoul National University. The results obtained were as follows; 1. The natural sex ratio of pigs born was about 50%, and B-body test sperm was a-so about 50%. It was, therefore, statistically non-significant differences of the sex ratio between the natural born pigs and B-body test sperm. 2. The B-body test sperm obtained from Fractionated semen was similar to B-body sperm of control 3. Spermatozoa of swine were separated into different fractions by sedimentation. B-body rest sperm to anode was 53.70%, and the B-body from bottom was 33.43%. 4. The swine semen could separate X- and Y-bearing sperm by galvanization without interfering the sperm liability. In galvanization of sperm, the percentage of the B-body sperm induced to anode was 60.4%, while the sperm to cathode was 28.15%. This experiments with seminal galvanization and sedimentation for the separation of X- and Y-bearing sperm have been exclusively conducted with swine. Since the data presented in this report were still unstable, more detail research would, so far, be needed.

유우의 산유능력과 초기체측치간의 유전력과 유전 및 표현형상관 추정에 관한 연구

오봉국,손시환,이정구 한국축산학회 1984 한국축산학회지 Vol.26 No.7

Heritability, genetic and phenotypic correlations between milk production and four body measurements taken at three ages before calving were estimated to study the usefulness of body measurements in predicting future milk production. Measurements of body length, withers height, chest girth, and weights were obtained at 6, 12, 18 months of ages, from the National Livestock Breeding Station in Korea. Heritability and correlations were estimated from paternal half sister analyses involving from 1,429 records of 44 sires. Estimates of heritability from paternal sister data for body measurements varied from 0.22 to 0.86. Phenotypic correlation between measurement traits and milk or milk fat yields fell between -0.09 and 0.06, and were not significantly different from zero. Estimates of genetic correlations were mostly negative. These associations indicate that any effort to select for milk production alone would lead to animals with reduced chest girth, withers height, body length, and weights. It was concluded, however, that body measurements seem to be of little value in predicting milk production and appeared some genetic antagonism between measures of body size and milk production in dariy cattle.

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.