• Journal of the Korean Data and Information Science Society
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• v.22 no.6
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• pp.1145-1152
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• 2011

This study was conducted to estimate genetic effects on economically important traits for genetic improvement in Hanwoo by using the real-time ultrasound measurements for longissimus dorsi muscle area (LMA), backfat thickness (BFT), and marbling score (Marb). The phenotypic data were obtained from 1,648 pedigreed cows, and general linear models were applied to test the effects of age, region, and body condition socre. The cows between 50 and 60 months of age had the greatest scores for LMA and BFT, and Marb (P<0.05). The cows in region C had the greatest scores for body condition socre, LMA and BFT, while in region J Marb was the lowest (P<0.05). There was positive relation with LMA, BFT, and Marb according to increase body condition socre. Heritabilities for LMA, BFT, and Marb were estimated as 0.136, 0.351, and 0.236, respectively. These results would provide primary information for the efficient implementation of genetic improvement schemes in Hanwoo.

• Proceedings of the Korean Society of Developmental Biology Conference
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• 2003.10a
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• pp.135-135
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• 2003

본 연구는 체세포 핵이식 복제 수정란의 이식에 의한 고능력 한우를 다량 증식하기 위한 방안을 확립하기 위하여 수행되었다. 본 실험에 공여된 체세포는 육질과 육량 등급이 국내에서 100위 이내의 암소 귀세포를 채취하여 동결 및 계대배양하여 사용하였다. 한편, 핵이식 수정란의 준비를 위하여 도축장에서 채취한 난소에서 난자를 회수하여 22시간 성숙배양 후 난구세포를 제거하고 극체가 존재하는 난자만을 선별하여 recipient cytoplasm으로 이용하였다. 난자의 제핵, 체세포 핵이식, 전기융합 및 활성화 처리는 본 실험실의 방법에 준하여 실시하였으며, 핵이식란은 CR1aa 배양액 내에서 5% $CO_2$, 95% Air 및 39$^{\circ}C$의 기상조건하에서 7일간 배양 후 이식에 이용되었다. 한편, 수란축은 2회 이상 정상 발정주기가 확인된 경산우와 미경산우에 25mg의 PG $F_{2}$$\alpha$/를 투여하여 발정을 유기하거나 자연발정우를 선발하여 수란축으로 이용하였다. 그 결과, 배반포기배를 이식한 경우 14두중 5두에서 임신이 확인되었으며 그중 4두에서 유산되었고, 1두는 임신 6개월령으로 정상 발육되고 있는 것이 확인되었지만 상실배기단계에서 이식된 경우는 임신이 되지 않았다. (중략)

• Food Science of Animal Resources
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• v.20 no.3
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• pp.214-221
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• 2000

사슴(Elk deer ♀, 월령 28~30개월, 체중 170$\pm$10kg)의 등심부위와 대퇴부위를 도축 직후 함기포장과 진공포장하여 4$^{\circ}C$에서 10일간 냉장하면서 경시적으로 이화학적 특성의 변화를 실험한 결과 지방산은 등심부위와 대퇴부의 모두 palmitic acid가 각각 35.16%와 31.75%가 많고 그 다음으로 oleic acid, stearic acid의 순으로 많아\ulcornerT다. 냉장기간이 경과하면서 포화지방산은 증가하였고 불포화지방산은 감소하는 경향이었는데 함기포장육의 변화 폭이 컸다. 냉장기간 중 TBA가는 등심부위 가 0.0598에서 0.5616 mgMA/kg, 대퇴부위가 0.0650에서 0.3770 mgMA/kg,이었으며, 냉장기간이 결과함에 따라 점차 상승하고 상승폭은 진공포장육보다 함기포장육이 대퇴부위보다 등심부위가 크게 나타났다. 냉장기간중 VBN가는 등심부위가 3.93에서 7.31 mg%, 대퇴부위가 3.98에서 6.35 mg%이 었으며 냉장기간이 경과함에 EK라 진공포장육보다 함기포장육이 대퇴부위보다 등심부위가 더 높게 나타났다. 이상의 결과를 종합하여 볼 때 등심부위와 대퇴부 모두 냉장 10일까지 신선한 상태이었고 진공포장육이 함기포장육보다 선도 유지가 잘 되었다.

• Journal of Animal Science and Technology
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• v.55 no.5
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• pp.373-380
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• 2013

The study aimed to develop prediction models of primal cut yield using body measurements of Hanwoo steers in Korea. The progeny of 874 steers at Hanwoo Improvement Main Center from 2008 to 2010 were recorded. Pearson's correlation coefficients for primal cuts and other traits were estimated. Primal cuts were adjusted for slaughter date and age using the SAS GLM procedure. Afterwards, a stepwise regression was performed on each primal cut by fitting body measurement traits. An independent covariable was selected at the highest coefficient of determination with the greater fitness model using Mallows's Cp statistic. Results showed that primal cuts were significantly influenced by slaughter date (P<0.01). The age at slaughter, however, was only significant for the top round (P<0.05). There was a moderate to high correlation between chest girth and tenderloin (0.54), loin (0.74), and rib (0.80). Most primal cut percentages were negatively related to BFT. Similar negative to low positive correlations were observed for primal cut percentage and body size traits. In addition, a correlation of 0.21 was observed between rib percentage and chest girth. The regression of body measurements on the adjusted primal cuts were significant for later traits. Regression estimates revealed that wither height, body length, rump length, hip bone width, and chest girth are important for primal cut weight and percentage determination. In particular, chest girth was always important for primal cut weight estimates.

• Parasites, Hosts and Diseases
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• v.30 no.1
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• pp.15-20
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• 1992

The Taenia species in East Asia, hitherto identified as Taenia saginata, has been recognized as differing from the classical descriptions of life cycles and was recently named Taenia saginata taiwanensis (tentatively until 1992) . Major differences between T. saginata and the newly recognized Asian T. saginata are their intermediate hosts and the infected tissues. Asian T. saginata metacestodes are found in the livers of pigs rather than in the muscles of cattle. In this study, we observed the natural infection status of Asian T saginata metacestodes in the livers of 25,358 pigs at an abattoir in Cheongju City, Korea, from 1989 to 1990. Total 256 livers(1.01%) were infected with 1∼96 (mean 2.5 per capita) metacestodes. Most of the metacestodes, however, were either calcified (87.1%) or highly degenerated (12.9%). Living metacestodes were found in only 0.01% (3/25,358) of the examined livers. And these were distributed randomly in each lobe of the livers. The liver of pigs in Korea was con- firmed as an organ hosting the Asian T. saginata metacestode. But its epidemiological significance as a source of human infections should be properly evaluated because of the rarity of the living metacestodes.

• Journal of Life Science
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• v.20 no.10
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• pp.1498-1504
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• 2010

A number of studies have shown that the calpain system is important in normal skeletal muscle growth. An increased rate of skeletal muscle growth can result from a decreased rate of muscle protein degradation, and this is associated with a decrease in activity of the calpain system, due principally to a large increase in calpastatin (CAST) activity. The CAST gene, mapped to BTA 7, is considered a candidate gene for beef tenderness and muscle growth. The present study used comparative sequencing of five novel polymorphisms located within exon 20 and 22 of the bovine CAST gene in Hanwoo: exon20- 109737G/A, 109749T/C, 109823T/C, exon22- 116151G/A, intron- 109926G/A. The association of the CAST SNPs with economic traits was studied. The 109926G/A showed a significant effect only on the longissimus muscle area (LMA, p<0.05) in Hanwoo. 109926G/A with the genotype GG had a significantly higher effect on LMA (75.35) than the genotype AA (69.6, p<0.05). Also, the 116151G/A showed a significant effect only on weight at 18 months (W18, p<0.05). 116151G/A with the genotype GG had a significantly higher effect on W18 (428.54) than the genotype AA (408.87, p<0.05).

• Food Science of Animal Resources
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• v.28 no.2
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• pp.196-203
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• 2008

This study was carried out to investigate the effect of sawdust-bedded thickness in floors (SBTF) of Hanwoo on meat quality of M. longissimus after slaughter. The 7 mon-aged bulls (22 heads) were housed in single sheds ($3{\times}8\;m^2$/animal) bedded with sawdust of 10, 15, and 20 cm thickness for 20 mon prior to slaughter. The M. longissimus from carcasses were then stored at $4{\pm}0.2^{\circ}C$ for 9 d. SBTF had no significant effect on carcass traits and pH, water-holding capacity, drip loss, cooking loss, Warner-Bratzler shear force, aroma pattern with electronic nose, and sensory attributes of beef. The 20 cm group had the highest crude fat and the lowest n6/n3 (p<0.05). At 9 d, the 10cm group showed the highest total reducing ability and the lowest TBARS content (p<0.05). During storage, the 10 and 20 cm groups had lower MetMb content, higher OxyMb content, and redder meat color than the 15 cm group (p<0.05).

• Journal of The Korean Society of Grassland and Forage Science
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• v.39 no.4
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• pp.264-271
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• 2019

This study was conducted to investigate the effect of whole crop rice based TMR on the meat quality of Korean Native Cattle (Hanwoo). Sixteen Hanwoo steers (average 8 months old) were divided into the control group (commercially marketed TMR) and the WCR-TMR group (whole crop rice based TMR). Feeding trials were carried out up to 30 months of age, and after slaughter, the strip loin were collected and analyzed for meat quality. There were no significant differences in proximate compositions of Hanwoo (P>0.05), and crude protein, crude fat and crude ash were 19.51~20.23 %, 11.53~11.35 % and 1.10~1.12 %, respectively. There was no significant difference in water holding capacity and cooking loss between treatments (P>0.05), but it was slightly lower in the control group. Among the various functional components in meat, β-carotene was not detected, but α-tocopherol was significantly higher in WCR-TMR group and vitamin A content in control (P<0.05). The a^⁎-value in the meat color index decreased significantly with longer storage period in the control group, whereas the WCR-TMR fed group showed no significant difference (P>0.05) according to the storage period. There were no difference between the treatments in the TBARS (2-Thiobarbituric acid reactive substances) value used as an indicator of lipid oxidation and in fatty acid content. But the control group had high myristic acid content, whereas the WCR-TMR supplemented group showed higher oleic acid and linoleic acid content. In conclusion, feeding of WCR based-TMR increased the α-tocopherol content, which is a functional ingredient in meat, and the other components were not significantly different from the control. Therefore, it was judged that there was no significant difference between WCR based and conventional TMR in meat quality characteristics.

• Journal of agriculture & life science
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• v.46 no.1
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• pp.123-131
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• 2012

This study was conducted to estimate correlation structure between Hanwoo steer growth traits - body weights at 6 month, 12 month, 18 month and 24 month of age, average daily gain, carcass traits, body size traits at 18 months of age. Hanwoo progeny test data(body weight, body size traits) collected from 2004 to 2008 on a total of 1,838 steers at Hanwoo Improvement Main Center(NACF) were analyzed. Carcass traits were used to score the 24 months of age and slaughter. Correlation analyses were performed with observed scales of the traits and with residuals considering fixed effects in generalized linear models. The correlated coefficient estimated between live weight at slaughter(24 months of age) and cold carcass weight was high at 0.92. Correlation between beef yield index values and backfat thickness was estimated to be high and negative at -0.92. Hip height and wither height was found to be highly correlated(0.89). Chest width and chest depth also was found to be highly correlated at 0.73. Rump width was highly correlated with chest depth(0.75) and chest width(0.74). Correlation between pelvic width and rump width was estimated to be 0.74. Hipbone width was shown to be highly correlated with chest depth(0.73), chest width(0.70), rump width(0.75), or pelvic width(0.75). Correlation between wither height and carcass weight was 0.48 in observed scale. Chest girth was phenotyically (residual correlation) correlated with carcass weight (0.51), the estimates of which were some higher than than with the other carcass traits. This study will be utilized for Hanwoo Steers genetic evaluation.

• Food Science of Animal Resources
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• v.25 no.2
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• pp.196-202
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• 2005

This study was carried out to investigate the effect of dietary Rhus verniciflua Stokes on the quality of Hanwoo (Korean cattle) beef during cold storage $(4^{\circ}C)$ after thawing. After 4 groups (3 heads/group) of 22 months-Hanwoo (Korean cattle) steen were fed a common basal diet with 0, 2, 4 and $6\%$ Rhus verniciflua Stokes (RVS) powder for 4 months prior to slaughter, samples of M semimembranous from 12 carcasses were stored at $-20^{\circ}C$ for 9 months. Crude fat was significantly lower in 4 and $6\%$ RVS treatments than in control (p<0.05). pH value was significantly higher in4 and $6\%$ RVS treatments than in control from 2 and 5 days (p<0.05). Thawing loss was not significantly different among the treatments but drip loss was significantly lower in 4 and $6\%$ RVS treatments than in control during storage (p<0.05). CIE $L^{\ast}$ value was significantly lower in RVS treatments than in control during storage (p<0.05) and CIE $a^{\ast}$ value was significantly higher in 4 and $6\%$ RVS treatments than in control (p<0..05). CIE $b^{\ast}$ value was significantly higher in control than in $6\%$ RVS treatment in 0 days (p<0.05) but it was significantly higher in $4\%$ RVS treatment than in control in 7 days (p<0.05). CIE $C^{\ast}$ value was significantly higher in $4\%$ RVS treatment than in control during storage (p<0.05) and CIE $h^0$ value was significantly lower in $4\%$ RVS treatment than in control (p<0.05). TBARS value of 2 days was significantly lower in 4 and $6\%$ RVS treatments than in control (p<0.05) but it was significantly lower in $4\%$ RVS treatment than the other treatments from 5 days (p<0.05). Surface MetMb concentration was significantly lower in RVS treatment than in control during storage (p<0.05) and it was significantly lower in $4\%$ RVS treatment than in the other treatments in 7days (p<0.05) but surface $R_{6.30}/R_{580}$ value was opposite to this result.