• Journal of Animal Science and Technology
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• 제59권12호
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• pp.25.1-25.7
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• 2017

Background: Rabbit breeding with high performance imported ones would be of benefit for genetic diversity and improvement of performance in domestic rabbit breeds. The rearing of more productive rabbit breeds could be pathway to improve the productivity and reduce the production cost. Maternal nutritional status exert a great influence on reproductive functions of does, which may expand from conception, through gestation and parturition and development of kits to puberty. Methods: Four breeds of rabbit were evaluated for their parturition, weaning and pubertal differences among the rabbit population in Ibadan, Nigeria. The breed consist of Fauve De Bourgogne (FDB), Chinchilla (CHA), British Spot (BS) and New Zealand White (NZW) rabbits. A total of 60 bucks and 360 does consisting of 15 bucks and 90 does per breed were mated in 6 mating cycles, three each of natural mating and artificial insemination. All does were synchronized for estrus with 20 IU pregnant mare serum gonadotropin 48 h prior to mating. The does after parturition were assessed for milk yield (g) and kit survival rate (%) till weaning, weight changes of kits from birth to puberty. At puberty, the pubertal age (days) and weight (g) of the offspring were assessed. Result: Results obtained reveals that British Spot doe had highest milk yield among the breeds which significantly increased growth of kit and weight at weaning in British Spot rabbits. Survival rates of Chinchilla kits were significantly (p < 0.05) higher than Fauve de Bourgogne, British Spot and New Zealand White kits. Puberty attainment of the rabbits indicates that British spot does and Fauve de Bourgogne bucks are early maturing. Conclusion: Chinchilla shows high kit survivability and British spot has highest milk yield among the four breeds of rabbit.

• The Plant Pathology Journal
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• 제19권3호
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• pp.143-147
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• 2003

Sensitivity of Phytophthora infestans isolates to fungicides metalaxyl and ethaboxam in Korea was examined with 260 isolates for 3 years (9 isolates in 2000,93 isolates in 2001, and 158 isolates in 2002). Both Al and A2 mating types were found from the isolates collected for 3 years. Al mating type was dominant in the population with 8 isolates (88.9%) in 2000, 84 isolates (89.4%) in 2001, and 138 isolates (87.3%) in 2002. Only some isolates from diseased tomatoes in Buyergun and diseased potatoes in Pyeongchanggun were of the A2 mating type. As for metalaxyl sensitivity, 77.0% of the isolates were moderately resistant with 8 isolates (88.9%) in 2000, 73 isolates (77.7%) in 2001, and 120 isolates (75.9%) in 2002. Meanwhile, those found resistant were 1 isolate (11.1%) in 2000, 16 isolates (17.0%) in 2001, and 33 isolates (20.9%) in 2002. Only 5 isolates (3.2%) were sensitive to metalaxyl in 2002. There was no significant difference in the sensitivity among years. As for ethaboxam, no isolate was able to grow at 5.0 $\mu\textrm{g}$ /ml, and only four isolates (1.5 %) grew at 1.0 $\mu\textrm{g}$ /ml with heavy retardation compared with the untreated control. Based on these 3-year results, the minimum inhibitory concentration (MIC) of ethaboxam to p. infestans was determined to be 0.2-1.0 $\mu\textrm{g}$ /ml. Results indicate that resistance development by p. infestans to ethaboxam is not likely to occur in the natural condition. furthermore, there was no indication of cross resistance between metalaxyl and ethaboxam because all the isolates, regardless of classification for their sensitivity to metalaxyl, were not able to grow at 5.0 $\mu\textrm{g}$ /ml of ethaboxam.

• International Journal of Industrial Entomology and Biomaterials
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• 제23권1호
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• pp.167-174
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• 2011

The large bumblebee $Bombus$ $terrestris$, indigenous to Europe and adjacent areas and used extensively for high-value crop pollination, has been artificially introduced to several parts of the world. Here we show the occurrence of interspecific hybridization between the bumblebee species $B.$ $hypocrita$ $sapporoensia$ and $B.$ $terrestris$ under laboratory conditions. The mating and oviposition percentages resulting from the interspecific hybridization of a $B.$ $terrestris$ queen with a $B.$ $h.$ $sapporoensis$ male were higher than those resulting from the intraspecific mating of $B.$ $h.$ $sapporoensis$. Furthermore, a competitive copulation experiment indicated that the mating of $B.$ $h.$ $sapporoensis$ males with $B.$ $terrestris$ queens was 1.2-fold more frequent than the mating of these males with $B.$ $h.$ $sapporoensis$ queens. The interspecific hybridization of a $B.$ $terrestris$ queen with a $B.$ $h.$ $sapporoensis$ male produced either $B.$ $terrestris$ workers or the $B.$ $terrestris$ male phenotype, and the hybridization of a $B.$ $h.$ $sapporoensis$ queen with a $B.$ $terrestris$ male produced $B.$ $h.$ $sapporoensis$ males. Our results indicated that interspecific hybridization occurred between $B.$ $h.$ $sapporoensis$ and $B.$ $terrestris$. These results suggest that such hybridization will have a negative competitive impact and will cause genetic contamination of native bumblebees.

• Asian-Australasian Journal of Animal Sciences
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• 제12권6호
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• pp.868-870
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• 1999

A total of 69 ovaries were collected from 345 camels slaughtered in Maiduguri abattoir, North-Eastern part of Nigeria, to study the influence of season on ovary weight and corpus luteum count in the dromedary (single humped) camel (Camelus dromedaries). Right ovary was significantly heavier (p<0.01) and had more follicular fluid than the left. Although corpus luteum count increased gradually throughout the study period, no camel had 3 active corpora lutea and only 53 out of the total number had two. Ovarian activity seem to be higher in the cold dry harmattan season, November/December, than during the warmer post rainy season, September/October. These periods can be exploited by farmers, especially peasants who rely heavily on natural mating, to obtain greater conception rates and reduce the chance of failure during mating.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2002년도 춘계공동학술대회
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• pp.272-279
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• 2002

A common task in assembly modeling is the determination of the position and orientation of a set of components by solving the spatial relationships between them. Assembly models could be constructed at various levels of abstraction. They could be classified into component or geometry-level assembly models. The geometry-level assembly design approach using mating constraints such as against and fits is widely used in the commercial modelers, but it may be very tedious in some cases fur designer. In this paper, we propose a new method to construct an assembly model at the component-level by extracting joint mating features from the kinematics constraints specified between components. The assembly model constructed using the proposed method includes hierarchical and relational assembly models, component/sub-assembly positions and degrees of freedom information. The proposed method is more intuitive and natural way of assembly design and it guarantees the topological robustness of assembly modification such as component replacement and modification.

• 한국균학회지
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• 제37권1호
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• pp.86-90
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• 2009

KACC에서 분양받은 C. militaris 4균주와 야생에서 채집된 6균주 그리고 교배 육성한 4균주를 대상으로 DNA분석에 의한 분류동정을 시행하였다. 표준균주 10균주와 교잡균주 4균주에서 조사된 전 부위(ITS1, 5.8S rDNA, ITS2)에서 많은 염기서열 차이를 보이고 있으나 같은 종으로 확인된 표준균주들과 수집균주들과 비교한 바 같은 균으로 분류된 것을 확인할 수 있었다. 교잡에 쓰여 졌던 표준 균주에서 교잡된 교잡균주 중 가장 우수한 교잡균주 mat1과 교잡에 사용되었던 표준균주(MPNU10306, MPNU10366)를 선택하여 RAPD 분석을 하였으며, RAPD에서 나타난 각 균주간의 다양한 유전적 변이가 관찰되었다. 이는 새로운 C. militaris종 균주로 판단되어지며, HPLC 분석에서도 교잡에 쓰여 졌던 표준균주보다 교잡한 C. militaris 균주가 cordycepin 생산량이 우수하게 나타났으며, 이는 교잡균주가 cordycepin 함량을 보다 더 높일 수 있음을 의미하고 상업적 가치가 있을 것이라 판단되어지며, 지속적인 연구가 필요할 것으로 생각된다.

• 한국산림과학회지
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• 제102권2호
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• pp.264-271
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• 2013

설악산 권금성 일대에 분포하는 잣나무 자연집단을 대상으로 동위효소와 cpSSR 표지를 이용하여 교배양식을 추정하였다. 동위효소를 이용하여 교배양식 모수를 추정한 결과 다수유전자좌 타가교배율($t_m$)은 0.882, 단일유전자좌 타가교배율($t_s$)은 0.881, 부계상관($r_p$)은 0.368로 유효 화분친 수는 평균 2.7개였다. cpSSR 표지를 이용하여 교배양식 모수를 추정한 결과, 타가교배율은 평균 0.831이었으며 유효 화분친 수는 평균 12.4개였다. 두 표지 간 평균 타가 교배율은 0.857로 침엽수종들의 타가교배율과 비슷한 수준이었다. 화분친 수는 동위효소를 이용하여 추정된 결과에 비해 cpSSR 표지로 추정된 결과가 높게 나타나서 DNA 표지의 개체식별력이 동위효소 표지에 비해 교배양식 구명에서 상대적으로 화분친을 정확하게 추정하는데 유리한 것으로 판단되었다.

• Applied Microscopy
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• 제31권4호
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• pp.385-392
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• 2001

본 연구의 목적은 키토산올리고당의 쥐 간조직 독성여부를 관찰하고자 하였다. 건강한 Wistar계 쥐를 사용하였다. 실험군은 Group 1. 일반식이를 섭취한 대조군, Group 2 0.1%(1mg/ml)키토산올리고당 수용액을 30일 간 음용수를 통해 자유자재로 섭취시킨 후 교미시켜 태어난 $F_1$ 세대, Group 3 $F_1$ 세대의 쥐에게 0.1%(1 mg/ml) 키토산올리고당 수용액을 30일간 음용수를 통해 자유자재로 섭취한 후 교미시켜 태어난 $F_2$ 세대, Group 40.1% (1 mg/ml) 키토산올리고당 수용액을 90일간 음용수를 통해 자유자재로 섭취시킨 군, Group 50.1% (1 mg/ml) 키토산올리고당 수용액을 365일간 음용수를 통해 자유자재로 섭취시킨 군의 쥐 등으로 각 실험군 당 쥐 10마리를 사용하였고, 다음과 같은 결과를 얻었다. Group 4의 경우 약간의 소포체 팽창을 관찰하였을뿐, 다른 실험군에서는 대조군과 비교하여 특별한 간 조직의 미세구조 변화를 관찰하지 못하였다. 결론적으로 키토산올리고당은 무독성 물질로서 안전성이 있다고 사료된다.

• 한국환경생태학회지
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• 제28권3호
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• pp.273-280
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• 2014

본 연구는 번식기 북방산개구리(Rana dybowskii)를 대상으로 고속도로 소음지역과 자연지역에서 울음소리 차이가 있는지 분석하였다. 연구대상지는 강원도 원주시 영동고속도로변 논 2개소와 소음 영향이 없는 자연지역 논 2개소를 선정하였다. 울음 녹음은 2014년 2월 24일, 2월 27일, 3월 14일, 18:30~20:00 사이에 진행하였다. 북방산개구리 번식기 울음은 자연지역에서 700Hz대에서 기음이 형성되었으며, 2~4개의 배음이 관측되었다. 반면 고속도로 소음지역 번식기 울음은 보다 높은 주파수대에서 기음이 형성되었을 뿐 아니라 배음도 2~7개까지 관측되었다. 분산분석 결과, 고속도로 소음에 직접 노출된 논에 서식하는 개구리 울음소리 제1배음의 주파수가 다른 지점에 서식하는 개구리 울음소리 주파수 보다 통계적으로 유의미하게 높은 것으로 나타났다. 하지만 고속도로와 인접한 지역이라 하더라도 지형의 단차가 있고 산림으로 막혀 있어 고속도로 소음에 의한 직접적인 영향을 받고 있지 않은 지점의 경우는 자연지역과 개구리 울음소리 차이가 없는 것으로 나타났다. 이는 북방산개구리가 고속도로 소음 환경에서 자연지역보다 고주파 영역에서 더 많은 배음을 만들어서 에너지 효율적으로 자동차 소음에 의한 음향 간섭을 피하기 때문으로 판단된다. 이 결과는 또한 인공적인 소음에 의한 개구리 번식을 방해하지 않기 위해서는 이 임계수준 이하로 서식처 소음 환경을 관리하는 것이 필요하다는 것을 시사해 준다.

• International Journal of Industrial Entomology and Biomaterials
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• 제2권2호
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• pp.91-105
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• 2001

Taxonomic and phylogenetic studies of firefly in Japan have been reviewed. Fourty-six lampyrid species and one rhagophthalmid are distributed in the Japanese Islands including the Ryukyus. Recently, molecular phylogenetic approaches have been employed in the systematic study of firefly using mitochondrial and luciferase genes. Based on the molecular phylogenetic trees, evolutionary process of flashing patterns related strictly to mating behavior was estimated. Furthermore, genetic diversity studies revealed geographic differentiation patterns within species, and conservation measures of firefly were proposed to protect genetic resources endemic to the localities.