• Food Science of Animal Resources
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• v.28 no.5
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• pp.604-609
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• 2008

Analyses were conducted to estimate carcass component of yield grade factors by sex and live weight class and to develop the prediction equation of retail product weight by sex in Korean native cattle (Hanwoo). Data from 42,113 Hanwoo carcasses were used to estimate the traits of yield grade factor and an additional 1,066 carcasses were used to develop the prediction equation of retail meat weight. The average of fasting weight of cow, bull and steer were 529 kg, 596 kg, and 634 kg respectively. Carcass weight (CW), backfat thickness (BFT), loineye area (REA), Index score of wholesale meat and yield grade were significantly (p<0.01) affected by sex and live weight. The lean meat percentage, fat percentage and bone percentage based on the weight of cold carcasses were significantly different (p<0.05) between sex groups. The equation of predicting the retail meat product from this study could be expressed as a multiple regression $Y=-4.18+0.63{\times}CW\;(kg)-0.17{\times}BFT\;(cm)+0.16{\times}REA\;(cm^2)$, $R^2=0.93$. Among the independent factors, the BFT was the highest contributor to the prediction equation. Using the equation from this study should allow for rapid, precise and cost-effective assessment of the retail product in Hanwoo beef carcasses.

• Journal of Embryo Transfer
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• v.9 no.1
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• pp.95-102
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• 1994

본 연구는 종모우의 선발방법으로 난포란을 이용하여 실험실내 정자의 수정능력을 직접 검정하여 평가코자 시도되었다. 즉 본 실험은 후대검정중에 있는 한우 후보종모우 15두의 동결융해정자의 수정능력을 평가하기 위하여 정액을 고장액(HIS)에 처리한 후 DM에서 6시간 그리고 소 난포액이 20% 첨가된 DM에서 4시간 전배양하여 수정능을 획득시켜 정자의 활력과 첨체 반응율을 조사하였고 전배양된 정자의 체내(토끼 난관) 또는 체외수정능력을 조사하기 위하여 FCS 15%, 발정암소혈정(CSS) 10%가 첨가된 mKRB에서 체외성숙된 한우난포란과 수정시켜 수정능력을 평가하였으며 인공수정에 의한 개체별 수태율과도 비교 검토한 바 다음과 같은 결론을 얻었다. 1. 한우 난포란의 체외성숙율은 BSA 첨가구 에서 43.8%, FCS 15% 첨가구에서 67.4%, CSS10% 첨가구에서 69.9%이었다. 2. 토끼 난관에서 체외수정율은 BSA 참가구에서 43.8%, FCS 15% 참가구 41.2% 및 CSS 10% 참가구 35.0% 이었다. 3. 후보종무우 15두의 정액을 HIS-DM으로 처리후 6시간 전배양하였을 때 정자의 활력지수는 9-32%였고 첨체반응율은 19-44% 이었으며 20% 난포액을 첨가하여 4시간 전배양 하였을 때 정자의 활력지수는 9-13% 이었고 첨체반응율은 20-43%로 개체간에 차이가 있었다. 4. 체외수정율은 6.6-85.7%였으며, 발정암소혈청(CSS) 10%가 첨가된 mKRB에서 성숙시킨 난포란이 FCS 15% 첨가된 mKRB에서 성숙시킨 난포란보다 다소 높았으나, 정자수정능획득방법간에는 차이가 없었 다. 5. 체외수정율에 있어서 전배양후 정자활력지수와는 부의 상관이 었으며, 첨체반응율과는 낮은 정의 상 관을 나타냈다. 6. 종모우의 수태율은 체외수정율, 정자활력지수 및 첨체반응율과 낮은 정의 상관관계를 나타냈다. 7. 종모우의 개체간 수태율 우열순위에서는 수정율순위와의 사이에 더욱 낮은 부의 상관관계를 보였다. 8. 이상의 연구결과 비록 후대정검중의 제한된 자료로 인하여 종모우 수태율과 체외수정율간에 유의적 인 상관관계는 없었으나, 연결 한우 수정율 평가에 대한 실험실내의 검정가능성을 찾을 수 있었다.

• Journal of Animal Environmental Science
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• v.5 no.3
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• pp.157-170
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• 1999

This study was conducted to investigate the effects of Scoria, Quartz porphyry and Oak charcoal powder feeding by 1% level of concentrate on the fattening cross bred bulls(5/8 Korean Native Cattle, 2/8 Charolais, 1/8 Brahman germ plasma) Feeding trial was conducted with 4 treatment groups which were T1(Full feeding of concentrate and roughage for 12 months), T2(T1 and Scoria addition), T3(T1 and Quartz porphyry addition) and T4(Oak charcoal addition) for 360 days, consisting of 32 heads whose initially weights were about 299.7kg. The results obtained are summarized as follows; 1. During the over-all period, average daily gains by T3, T4, T2 and T1 were 1.024, 0.987, 0.977kg and 0.964, respectively, without a significant difference by treatments. 2. Concentrate intakes per body weight and TDN intakes required per unit of kilogram gain were lower in addition agent groups than in control, and in all the treatments feed efficiency was higher at early stage for 360 fattening day than at end stage. 3. Carcass weight, dressing percent, back-fat thickness and loin eye muscle area by treatments were 330.9 to 348.4kg(average 340.3kg), 55.2~56.2(average 55.8%), 0.41~0.55(average 0.46cm)and 76.0~80.9$\textrm{cm}^2$(average 77.6$\textrm{cm}^2$), respectively, and were improved in addition agent groups than in control. 4. Meat quality grade is higher in addition agent groups than in control, and heads of 1st grade by treatments was 3, 2, 1 and none in T4, T2, T3 and T1, respectively. 5. Incidence heads of diseases by treatment were not apparently different, but diseases of digestive system was decreased in addition agent groups than in control. 6. The nitrate nitrogen content of fattening bull dung which collected in rectum were 0.082~0.089% (average 0.084%), and the content in addition agent groups was smaller than in controll. 7. Income was higher in order of T4, T3, T2, and T1 and incomes of treatment groups were grater than that of control group by 21.4 to 33.5 percent. According to the above results it may be concluded that fattening bulls may be required to feed no more than 1% of Scoria, Quartz porphyry and Oak charcoal powder based on the concentrate feeding level during the fattening period(12 to 24 month of age) to produce high quality meat and increase income.

• Journal of Environmental Impact Assessment
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• v.6 no.1
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• pp.77-92
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• 1997

To know of the biological basic method that can improve the environment of the organisms that inhabit at Deokjin Park. We studied the flora and the fauna in Deokjin Park on June, 1996. The study was surveyed and researched according to the items floras, phytoplanktons, insects and vertebrates. The floras are composed of eleven varieties, one forma, eighty-three species, eighty-four genera and forty-nine families. In the lake of Deokjin Park, the dominant species were Nelembo nucifera and Spirodela polyrhiza. The authors thought that those species be artificially excluded in winter for the improvement of the quality of water. The phytoplanktons were composed of forty genera, eighteen families, ten orders and six classes. Among those, Anacystis(=Microcystis) and Anabaena that make eutrophication, were distributed in the lake of Deokjin Park. The fauna of insects were composed of forty-one species, thirty families and eleven orders. The authors observed seven species of fish, two species of amphibian, three species of reptile, seven species of the bird and one species of mammal. Among those, Bull-frog and Blue-turtle as exotic species must be excluded by artificial methods for the other native organisms of the lake of Deokjin Park.

• Korean Journal of Agricultural Science
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• v.16 no.1
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• pp.62-70
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• 1989

This study was conducted to determine the main effects of the sire, farrowing year, month and parity on the average daily gain, feed efficiency, body weight and body type on the basis of data obtained from 64 Korean native bulls from 8 sires raised at Chungnam Animal Breeding Station from 1985 to 1987. The results obtained are summarized as follows; 1. Average daily gain, DCP and TDN requirement were 1.049, 0.977 and 4.584kg, and the effect of sire was highly significant(p<0.01) for average daily gain and TDN requirement, respectively. 2. Body weight at 6 and 12 months of age were 182.023 and 371.750kg, and the effects of sire, farrowing year and month were highly significant(p<0.01) for body weights, respectively. 3. Wither height and body length were 106.672 and 108.986cm for 6 months of age, 119.984 and 132.312cm for 12 month of age, and the effect of sire was significant(p<0.05) for these all traits, respectively. 4. Chest girth and chest width were 129.578 and 27.937cm for 6 months of age, 166.281 and 38.357cm for 12 months of age, and the effect of sire was significant(p<0.05) for chest girth at 6 and 12 months of age, respectively.

• Journal of Life Science
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• v.29 no.1
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• pp.1-8
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• 2019

In Hanwoo cattle (Korean native cattle), there is a scarcity of comparative analysis papers using highdepth sequencing and haplotype phasing, particularly a comparative analysis of the Truseq Synthetic Long-Read Haplotyping sequencing platform serviced by Illumina (TSLRH) versus the Chromium Genome Sequencing platform serviced by 10X Genomics (10XG). DNA was extracted from the sperm of a Hanwoo breeding bull (ID: TN1505D2184/27214) provided by Hanwoo research canter and used for the generation of sequence data from both the sequencing platforms. We then identified SNVs using an appropriate analysis pipeline tailored for each platform. The TSLRH and 10XG platforms generated a total of 355,208,304 and 1,632,772,004 reads, respectively, corresponding to a Q30 (%) of 89.04% and 88.60%, respectively, of which 351,992,768(99.09%) and 1,526,641,824(93.50%) were successfully mapped. For the TSLRH and 10XG platforms, the mean depth of the sequencing was 13.04X and 74.3X, the longest phase block was 1,982,706 bp and 1,480,081 bp, the N50 phase block was 57,637 bp and 114,394 bp, the total number of SNVs identified was 4,534,989 and 8,496,813, and the total phased rate was 72.29% and 87.67%, respectively. Moreover, for each chromosome, we identified unique and common SNVs using both sequencing platforms. The number of SNVs was directly proportional to the length of the chromosome. Based on our results, we recommend the use of the 10XG platform for haplotype phasing and SNV identification, as it generated a longer N50 phase block, in addition to a higher mean depth, total number of reads, total number of SNVs, and phase rate, than the TSLRH platform.

• Journal of Embryo Transfer
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• v.30 no.1
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• pp.45-50
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• 2015

The purpose of this study is to produce wanted sex progeny of genetically confined White Hanwoo (albinism) with preselected sex sperm. One bull of White Hanwoo was chosen for semen donor and X sperm was sorted by MoFlo XDP cell sorter. To compare the pregnancy and birth rates, KPN straw was used as control, total number of unsorted sperm was $20{\times}10^6/straw$. Sexed X frozen semen with $20{\times}10^6$ cells or $4{\times}10^6$ cells per straw were in seminated twice on Hanwoo heifers. The abnormality of the sexed X semen was $24.9{\pm}7.31%$ and distal reflex abnormality of mid piece was significantly (p<0.05) higher (11.7%) compared with that of KPN 768 (5.6%). There were no differences on the pregnancy and birth rates between $2{\times}10^6$ cells or $4{\times}10^6$ cells of X-sperm but KPN semen showed significant differences (p<0.05). The pregnancy rates of KPN 768, $2{\times}10^6$ cells and $4{\times}10^6$ cells X-sperm of White Hanwoo cattle were 85.0%, 26.3% and 50%. The birth rates were 80.0%, 15.8% and 21.4%, respectively. The female offspring rates of KPN 768, $2{\times}10^6$ cells and $4{\times}10^6$ cells X-sperm of White Hanwoo cattle were 43.8%, 100% and 100% (p<0.05). These results indicated that sex sorted White Hanwoo could be used for the production of wanted progeny with $2{\times}10^6$ cells/straw for AI. To increase the efficiency of calf production, the sperm number of sex sorted semen will be optimized for sex selection of White Hanwoo progeny.