• Reproductive and Developmental Biology
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• 제30권3호
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• pp.195-199
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• 2006

본 연구는 후산정체 젖소에 있어서 Lipopolysaccharide(LPS)의 처리가 번식 성적에 미치는 영향을 구명하기 위하여 분만 후 12시간이 경과하여도 후산이 배출되지 않은 홀스타인 개체 33두 및 대조구 12두에 대하여 분만후 20일째에 LPS 100 ${\mu}g$을 자궁 내에 주입한 다음 7일후에 발정이 발현되었을 때 인공수정을 실시하여 다음과 같은 결과를 얻었다. 후산정체 젖소에 있어서 첫 수정에 의한 수태율은 대조구의 경우 공시한 12두가 모두 첫 수정에 의해 수태가 되지 않았고 처리구는 33두중 11두가 수태되어 33.3%의 수태율을 나타내었다. 후산정체 젖소에 있어서 대조구 및 처리구의 분만후 수태까지의 일수는 각각 $149.6{\pm}34.3$일 및 $53.0{\pm}12.5$일로 처리구가 대조구에 비하여 유의적(p<0.01)으로 단축되는 경향을 나타내었다. 후산정체 젖소에 있어서 대조구 및 처리구의 수태당 종부 횟수는 각각 $3.6{\pm}0.8$회 및 $2.1{\pm}0.3$회로 처리구가 대조구에 비하여 유의적(p<0.05)으로 낮은 경향을 나타내었다.

• 한국수정란이식학회지
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• 제29권1호
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• pp.7-12
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• 2014

본 연구는 한우 번식 기록이 잘 유지되고 있는 4개 농장의 2007년 1월부터 2010년 10월까지의 번식 자료 수집하여 분석하였다. 수태 당 평균 수정 횟수와 평균 공태일은 A농장 $1.7{\pm}0.1$회와 $77.4{\pm}4.8$일, B농장 $1.5{\pm}0.1$회와 $150.8{\pm}11.2$일, C농장 $1.5{\pm}0.1$회와 $90.4{\pm}4.5$일, D농장 $1.4{\pm}0.1$회와 $71.4{\pm}2.5$일이었다. 호르몬으로 발정을 유도하는 D농장을 제외한 3개 농장 531두의 번식 기록으로 분만 후 첫 수정 시기에 따른 평균 수정 횟수와 평균 공태일을 분석한 결과, 총 5개의 수정 시기에 따른 수정 횟수는 30일 이전 첫 수정이 $2.1{\pm}0.2$회로 31일 이후 첫 수정보다 유의적으로 높았다. 번식 장애우 58두에 2가지 배란 동기화법을 사용하여 수태율을 확인해 본 결과, Ovsynsh 법은 55.2%의 수태율을, CIDR-based TAI 법은 65.5%의 수태율을 나타냈다. 농장의 번식률을 높이기 위해서는 정확한 번식 기록 작성, 발정 관찰, 수정 후 임신 감정, 번식 기관 검진, 번식률을 고려한 첫 수정 시기 수정 등이 필요하다.

• 한국IT서비스학회지
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• 제11권2호
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• pp.107-118
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• 2012

Recently, as the clouding computing begins to receive a great attention from people all over the world, it became the most popular buzz word in recent IT magazines or journal and heard it in many different services or different fields. However, a notion of the cloud service is defined vaguely compared to increasing attentions from others. Generally the cloud service could be understood as a specific service model base on the clouding computing, but the cloud, the cloud computing, the cloud computing service and cloud service, these four all terms are often used without any distinction of its notions and characteristics so that it's difficult to define the exact nature of the cloud service. To explore and analyze the cloud service systematically, an accurate conception and scope have to be preceded. Therefore this study is to firstly clarify its definition by Delpi method using expert group and then tries to provide the foundation needed to enable relative research such as establishing business model or value chain and policies for its activation to set off. For the Delpi, 16 experts participated in several surveys from different fields such industry, academy and research sector. As a result of the research, Characteristics of the Cloud Service are followings : Pay per use, Scalability, Internet centric Virtualization. And the scope as defined including Grid Computing, Utility Computing, Server Based Computing, Network Computing.

• 한국수정란이식학회지
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• 제22권2호
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• pp.111-114
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• 2007

본 연구는 젖소의 산유 능력에 따른 번식 성적을 조사하기 위하여 축산과학원 시험우사에서 사육중인 젖소를 이용하여 분만 후 유즙중 P4농도를 분석하였고, 전문경영체농장 22개 소에서 사육중인 젖소에 대한 번식 기록을 이용하여 고능력우(305일 유량 10,000 kg 이상)와 평균 능력우(305일 유량 10,000 kg이하)의 번식 성적을 조사한 결과는 다음과 같다. 1. 젖소의 분만 후 progesterone peak는 고능력 및 평균 능력우의 경우에 각각 $38.8{\pm}11.1$ 및 $39.6{\pm}9.7$일로 거의 비슷한 결과를 나타내었다. 2. 분만 후 첫 발정까지의 일수는 평균 능력우 및 고능력우가 각각 $99.4{\pm}2.1$일 및 $117.7{\pm}4.2$일로 고능력우가 평균 능력우에 비하여 11.6일 늦어지는 결과를 나타내었고(p<0.01), 분만 후 수태까지의 일수도 평균 능력우 및 고능력우가 각각 $145.9{\pm}3.8$일 및 $165.9{\pm}6.5$일로 고능력우가 평균 능력우에 비하여 20일 늦어지는 결과를 나타내었다(p<0.01). 그리고 분만 간격은 평균 능력우 및 고능력 우가 각각 $421.5{\pm}4.0$일 및 $448.4{\pm}7.2$일로 고능력우가 평균 능력우에 비하여 26.9일 연장되었다(p<0.01).

• 한국수정란이식학회지
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• 제31권3호
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• pp.255-260
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• 2016

The aim of this study is to evaluate the effects of vitamin or mineral supplements on the conception rates of dairy heifers when replacing the last injection of GnRH with hCG in ovsynch protocol (experiment 1) and also to investigate whether the estrus synchronization treatment in the heifer stage affects the conception rates after $1^{st}$ parturition (experiment 2). In experiment 1, 50 heifers were randomly assigned into 3 groups: 20 heifers each in groups 1 and 2, and 10 in group 3. All three groups were treated with an intramuscular injection of GnRH on day 0 (day 0 = the day of program start), $PGF_{2{\alpha}}$ on day 7 and hCG on day 9, and were inseminated on day 10, 12~16h after hCG injection. In group 1 (vitamin group), the heifers were treated with an intramuscular injection of 5 ml of vitamin-ADE $500^{(R)}$, and group 2 (mineral group) was treated twice with an intramuscular injection of 30 ml of mineral supplement-LAPTOVET$^{(R)}$ on a one-week interval beginning on the day of hormone treatment (day 0 and day 7 respectively). Group 3 (control) was treated only with hormones. Pregnancy diagnosis was performed by ultrasonography through a rectal probe. First service conception rates (FSCR) and average services per conception (ASPC) were recorded for all subjects. Of the total 50 heifers, 6 (2 in group 1, 3 in group 2, and 1 in group 3) heifers were eliminated due to accidents during experiment 1. FSCRs were 58.8% (10/17), 66.7% (12/18) and 44.4% (4/9) in groups 1, 2 and 3, respectively. ASPCs were $1.53{\pm}0.72$, $1.27{\pm}0.59$ and $1.63{\pm}0.74$ in groups 1, 2 and 3, respectively. Although there were no significant difference between the groups, relatively good results (higher FSCR and lower ASPC) were obtained in both group 1 and 2. In experiment 2, 11 primiparous cows from group 2 of experiment 1 in heifer stage which had been treated both with the hormones for estrus synchronizing and mineral supplements (ES group), and 12 primiparous cows treated only with minerals (non-ES group) were compared to examine the effects of estrus synchronization program on conception rates after $1^{st}$ parturition. Following the examination, postpartum ASPCs were $1.55{\pm}0.82$ and $2.17{\pm}1.47$ in ES group and non-ES group, respectively. The postpartum average days open (ADO) were $116{\pm}56$ and $197{\pm}93$ in ES group and non-ES group, respectively. Although there were no significant difference between the two groups, desirable results (lower ASPC and shorter ADO) were found in ES group after $1^{st}$ parturiton. In conclusion, experiment 1 indicates that vitamin or mineral supplement with ovsynch protocol may have some positive effect on FSCR and ASPC of dairy heifers, and in experiment 2, ES program in heifer stage had a positive effect on ASPC and ADO following $1^{st}$ parturition.

• Asian-Australasian Journal of Animal Sciences
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• 제24권9호
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• pp.1192-1198
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• 2011

Peri-partum metabolic profile was evaluated in winter and summer calving, with 15 Murrah buffaloes in each seasonal group. In summer calvers, significantly lower values were observed for blood plasma urea nitrogen (BUN) at day 30 pre-partum (p<0.05), on calving day (p<0.05) and at all other stages (p<0.01); plasma non-esterified fatty acids (NEFA) values were significantly lower on day 30 pre-partum (p<0.01) and on day 60 post-partum (p<0.05). This was associated with significant reduction in days to first service (DFS) and service per conception (SPC) and an overall better reproductive performance in terms of service period, risk to first service on days 60, 90 and >90, and pregnancy risk to first service up to days 60 and 90. This may be attributed to better pre-partum nutritional status. Cervical and uterine involution were completed in fewer days, involutional changes took place at a faster pace and there were a lower number of abnormal involutional changes in winter compared to summer season. This may be attributed to better post-partum nutrition and less environmental stress. However, validation requires further targeted cohort investigation with a large sample size.

• Clinical and Experimental Reproductive Medicine
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• 제7권1_2호
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• pp.27-34
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• 1980

The status of artificial insemination was surveyed by investigating 20796 heads of adult dairy cattle out of 30464 heads at 1649 dairy farms located Seoul and Gyung-Gi and Chung-Cheong province area, and the results are as follows: 1. There were 286 small farms feeding less than 5 heads occupying 17.3% of total farm number, and 1083 medium sized dairy farms feeding between $6{\sim}20$ heads occupying 65.64% and also 280 large dairy farms feeding more than 21 heads occupying 17.06% of total. 2. Population of cow aging from 2 to 6 years were 87.26% and among 20907 heads of dairy cattles which had calved previously 13196 heads had histories of one to four calving 90.40%. 3. The successful conception rate with first A. I. occupied only 53.43% and 92.4% after third A. I. service. The average A. I. frequency for successful conception per/head was 1.8 times. 4. The breeding status was pregnancy 61.72%, uncertain pregnancy 19.39%, and as physiological vacancy 12.48% and reproductive disorders 10.62%. 5. Among 1264 heads of reproductive disorders 856 heads were clue to ovarian diseases and occupied 68.98% of total disorders and uterus diseases 10.64% and repeat breeders occupied 17.64%.

• 한국수정란이식학회지
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• 제30권4호
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• pp.265-270
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• 2015

Growth rate during rearing, which varies depending on provided nutrition, has been related with age at $1^{st}$ calving (AFC). This study investigated the effect of upgrowth parameters during the rearing period on the reproduction of nulliparous Holstein heifers. The study comprised 77 successively born heifers from the same herd. Growth rate and fertility traits were measured during rearing and fertility parameters were recorded in lactations 1. Growth parameters (body weight, height, heart girth and body length) were measured at the approximate birth time, 270 and 450 d of age. Reproduction data collected included age at $1^{st}$ breeding, number of services per conception (S/C), pregnancy rate to $1^{st}$ artificial insemination, AFC. Animals were subsequently divided into 4 AFC groups for analysis: <23 mo, 23~25 mo, 26~30 mo and >30 mo. The AFC reflected both upgrowth rate and heifer reproduction, with later calving heifers smaller. Increased skeletal growth (at 270 and 450 d) was related with a reduced AFC (p<0.05). Early calving animals (<23 mo) had the best reproduction as nulliparous heifers, with most conceiving at first service (87.5%). Fertility in the first lactation was the worst in the oldest AFC group (>30 mo). In the 1st lactation period, a number of services per conception ($3.1{\pm}0.3$) increased with increasing AFC (>30 mo). Sub-optimal upgrowth related with an increased AFC could be mitigated by improved monitoring of replacement heifers during the rearing period.

• 대한지구과학교육학회지
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• 제6권3호
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• pp.252-260
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• 2013

The purpose of this study is find out the correlation of level of knowledge of pre-service elementary teacher with space perception ability on 'Earth and Space' of elementary science. During the second semester of 2013, for 15 weeks, the classes were conducted for 3 hours per week and we find out knowledge Understanding degree and select terms offered by 5th grade science courses 'The solar system and the stars', 'Earth and Moon', 'change of seasons' section and measured space perception ability degree of pre-service elementary school teacher with a questionnaire. We analyzed the correlation of understanding level of knowledge in the field of astronomy of pre-service elementary school teacher with space perception ability. The results of the study are presented as follows. First, pre-service elementary school teacher showed a low level of knowledge understanding as it goes the upper grades about upper concept in 'The solar system and the stars', 'Earth and Moon', 'change of seasons' section' of astronomy area of elementary science 'Earth and space sector'. The pre-service elementary school teachers needs to acquire knowledge of astronomy area in elementary school curriculum. Second, pre-service elementary school teacher showed that there are differences individually in 'finding solid body' of sub-element of space perception ability. This shows that 'finding solid body' factor is associated with space perception ability. Third, in the section of 'The earth and the Universe' for elementary education, 'Reflection' and 'Finding solid body' which are low-level components of space perception ability were verified that have a corelationship with general grades in the astronomy conception test.

• Reproductive and Developmental Biology
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• 제38권3호
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• pp.123-127
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• 2014

This study was conducted for SNPs in the 5'-regions of estrogen receptor-${\alpha}$ (ESR-${\alpha}$), and association with calving interval (CI), service per conception (SPC) and 305 days milk yield in Hanwoo and Holstein dairy cattle. The genetic improvement was incurred low reproduction performance. The objective of this study was to investigate connections between single nucleotide polymorphisms (SNP) of Estrogen receptor-${\alpha}$ (ESR-${\alpha}$) with reproduction performance (calving interval, service per conception, and 305 d milk yield) in Hanwoo and Holstein dairy cattle. Hanwoo and Holstein blood samples were collected from 183 and 124 dam of breeding farms and DNA was extracted. Primer design was based on NCBI GenBank (Accession No. AY340579). The PCR-RFLP method with Bgl I was used to genotype the cattle. The result showed two variants of the ESR-${\alpha}$ gene. The Bgl I cut the 492 bp amplification product into 322 bp and 170 bp fragments for allele G, while allele A remained uncut, resulting in two restriction fragments for homozygote G/G and three fragments for heterozygote A/G. We found two of different genotypes in these breeds, A/G and G/G. In Hanwoo, the A/G genotype frequency was 0.13, and G/G was 0.87. The CI of A/G was $382.18{\pm}10.03$ days, and G/G was $381.69{\pm}5.22$ days. The SPC of A/G was $1.62{\pm}0.16$, and G/G was $1.32{\pm}0.04$. While CI showed no significance difference, SPC exhibited significant difference (p<0.05). In Holstein cattle, the frequency of genotype A/G was 0.02 and G/G was 0.98. The 305 days milk yield of A/G was $7,253.00{\pm}936.00kg$ and of G/G was $8,747.51{\pm}204.88kg$, showing no significant difference.