• Journal of Practical Agriculture & Fisheries Research
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• v.24 no.1
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• pp.41-48
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• 2022

This study was conducted to investigate effects of corn silage on final fattening performance, carcass characteristics, and gene expression of Hanwoo Longissimus dorsi muscle biopsy. Twenty one steers with initial body weight of control 291.5±6.5kg, corn silage 291.7.0±17.3kg were used for 18 months of fattening period. Average daily gain of corn silage tended to increase compared to control in early fattening period(p=0.092). Feed conversion ratio of corn silage was higher than control in early fattening(p=0.005). The animals in corn silage increased A grade 23% in meat quantity than the control. Myogenic gene expression on the Longissimus dorsi biopsy were compared between corn silage and control. The level of myosin heavy chain(MHC) I, IIX mRNA were greater than the control in the whole period(p<0.05). The level of Peroxisome proliferator-activated receptor γ (PPAR γ) mRNA was greater than the corn silage(p<0.05). Inconclusion, corn silage will be possible to use as an alternative concentrate feeding system.

• Journal of Animal Science and Technology
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• v.51 no.1
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• pp.69-74
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• 2009

This study was carried out to investigate the carcass characteristics of crossbred pigs according to mating system, carcass grade and age at marketing. A total of 656 pigs of 128 gilts and 528 barrows were collected and analyzed at public slaughter house. Differences between LY and LYD crossbred on marbling score and water holding capacity were significantly (p<0.05) found. The influences of LY and LYD crossbred on carcass weight, backfat thickness, meat colour, carcass grade and age at marketing were not significantly showed. The carcass weight of D carcass grade was significantly (p<0.05) heavier than that of the other grade. The backfat thickness was significantly (p<0.05) appeared gradually in accordance with the increase of carcass grade. There was significantly difference among the carcass grades on water holding capacity (p<0.05). The differences among the carcass grades on the meat colour, marbling score and age at marketing were not found significantly. The carcass weight of high age group at marketing was significantly heavier than that of the low age group (p<0.05). The backfat thickness of the group of high age at marketing was significantly thicker than that of the group of low age (p<0.05). There were significant differences among age group at marketing in marbling score, carcass grade, and water holding capacity, respectively (p<0.05). The carcass weight was positively correlated with the backfat thickness but negatively correlated with the carcass grade. The correlation between the backfat and carcass grade was significantly negative. The meat colour was negatively correlated with water holding capacity.

• Proceedings of the Korean Society of Developmental Biology Conference
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• 2003.10a
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• pp.139-139
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• 2003

최근, 한우의 수정란 체외이식두수가 급격히 늘어나고 있으나, 모축의 등록번호를 대부분 확인 할 수 없으며, 확인이 가능할지라도 개체별 수정란의 생산이 거의 이루어지지 않고 있다. 본 실험에서는 모축의 등록번호가 확인된 개체의 난소로부터 채취한 난포란만을 체외성숙, 수정, 배양하여 배 발생율을 조사하고, 동결성적을 조사하였다. 도축된 한우의 난소를 개체별로 채취하여 2$0^{\circ}C$생리식염수에 넣어 3시간 이내에 실험실로 운반하고, 난포란을 채취하였다 개체별로 채취한 난포란은 9~47개/난소였고, 평균 14.3개/난소였다. 개체별 난포란은 IVMD 101 (일본, 펩티트연구소)에서 22물24시간 동안 체외 성숙시킨 후, IVF 100(일본, 펩티트연구소)으로 2회 세정한 후, 각각의 배양액 50${\mu}\ell$ 소적에 5개씩 5~6시간 수정시켰다. 수정란을 저 산소 배지 IVD 101 (일본, 펩티트연구소)로 7~9일간 배양하여 배 발생율을 조사하고 동결하였다. 평균 수정율은 81%, 배반포의 발생율은 35% 였으며, 동결 가능한 수정란은 평균 4개/두 정도 얻을 수 있었다. 이상의 결과로 한우의 개체가 확인된 난소로부터 수정란생산이 가능하고, 육질등급이 우수한 한우의 수정란생산이 가능해졌으며, 앞으로 고 능력 젖소의 난소에서도 고능력 수정란의 생산이 가능할 것으로 사료된다.

• Korean Journal of Veterinary Research
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• v.51 no.2
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• pp.93-99
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• 2011

This study surveyed the prevalence of traumatic reticular diseases (TRD) of slaughter cattle in Korea, the typology of the causative foreign bodies and the effects on beef quality and carcass weight. The overall prevalence of TRD in 3,121 slaughter cattle was 5.5%. However, the prevalence was significantly higher in Korea indigenous cattle Hanwoo (5.8%, p < 0.05) and female cattle (20.75%, p < 0.001). The prevalence significantly increased in aged cattle (p < 0.001). Major lesions related to foreign bodies were reticulitis (96%) and peritonitis (86%). Most causative foreign bodies were made of iron including nails, wires, steel rods, screw nails, and syringe needles. Cattle affected with TRD produced significantly lower grade quality of beef compared to normal cattle (p < 0.0001), but TRD did not affect carcass weight. The data will be useful in the management of TRD, with the aim of increasing beef productivity in Korea.

• Korean Journal of Organic Agriculture
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• v.17 no.3
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• pp.393-403
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• 2009

This study was conducted to investigate the productivity of Hanwoo steers by feeding self-product organic rice straw and concentrates(conventional, T1 and organic T2). Sixteen Hanwoo steers(8 months on the average) were randomly assigned to two treatment groups. Feeding trail was carried out in 2 treatment(8 heads/ treatment) by Hanwoo steers for 600 days form 8 to 28 months in age. The range of average daily gains of T1 and T2 were 0.76 to 0.77kg in the growing stage, 0.93 to 0.90kg in the first fattening stage, 0.99 to 0.84kg in the middle fattening stage, and 0.59 to 0.64kg in the latter fattening, respectively, and the gains for overall period was higher in T1 than in T2. Concentrates and total digestive nutrients(TDN)(T1) intakes per unit of kg gains were higher than T2 without significant difference. In carcass characteristics, the carcass weight in T1 were higher about 5% than in T2. According to the above results, it may be concluded that dry matter(DM) intakes, crude protein(CP) and TDN contents of feedstuff between treatments was no significant difference. but marbling in T2 score was higher than in T1 about 20%. There were no significant differences rib-eye area, back fat thickness and fat color(p>0.05).

• Food Science of Animal Resources
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• v.27 no.4
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• pp.450-456
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• 2007

This study was carried out investigate the effects of the period of dietary supplementation and the level of fermented mineral feed on daily body weight gain and carcass characteristics of Hanwoo steer. The dietary treatments were compared during two supplementation periods (T1:Feeding Hanwoo steers from 18 months to 25 months, T2: feeding Hanwoo steers from 7 months to 25 months), and the diets tested were of four types (0%: normal concentrate as a basal diet, 1%: 1% addition of fermented mineral feed, 2%: 2% addition of fermented mineral feed, and 3%: 3% addition of fermented mineral feed). A Total of 35 Hanwoo steers were allocated into 7 feeding groups. The daily gain of the 0% fermented mineral feed group was lower (0.64 kg) than that of the other groups (1%: 1.08 kg, 2%: 0.90 kg, 3% treatment: 0.75 kg) for the T1 period, and for the T2 period the order was 1% (0.98 kg) > 0% (0.75 kg) > 1% (0.89 kg). The amount of back fat in decreasing order was as follows: 0% (12.0) > 1% (10.8) > 2% (10.2) > 3% fermented mineral feed (7.8 mm) for the T1 period, and for the T2 period the order was C (16 mm) > T1 (13.8 mm) > T3 treatment (12.6 mm). Eye muscle area increased with increased fermented mineral feed levels. The marbling score of the T1 groups was highest with 3% fermented mineral feed (4.2), and of the T2 groups, the highest score was seen with 1% fermented mineral feed (5.6). Meat color and meat maturity were not different among all groups. The grade of meat quantity and meat quality of both the T1 and T2 groups were highest with the addition of 3% fermented mineral feed. The daily income ranged from 2,062 won to 5,265 won in the T1 groups, which were ordered as follows: 1% > 2% > 3% > 0% fermented mineral feed, and of the T2 groups, the 1% group was highest at 6,098 Won, while the 3% group was lowest at 4,590 Won.

• Food Science of Animal Resources
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• v.28 no.3
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• pp.333-343
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• 2008

This study was conducted to investigate the compositional properties by different cut of Hanwoo steer beef. 10 cuts [Abjin (short plate), Bosup (top sirloin), Cheggt (striploin), Dngsim (Ioin), Guri (chuck tender), Hongduke (eye of round), Moksim (chuck roll), Sulgit (bottom round), Udoon (top round), Yangji (brisket)] were prepared from 10 Hanwoo steers ($24{\sim}28$ mon old) were used for the experiment. Calorie contents were $2,205{\sim}3713.20\;cal/g$ and loin, striploin, short plate were significantly higher than the other cuts (p<0.05). Loin was highest in cholesterol content, whereas top round and eye of round were lowest among 10 cuts (p<0.05). There were no significant differences in soluble and insoluble collagen contents although chuck tender, chuck roll and bottom round contained significantly higher total collagen and loin and striploin contained significantly lower total collagen contents than the other cuts (p<0.05). The result from the analysis of free amino acids showed that glutamate and alanine contents were $275.99{\sim}536.04\;mg/100g$, $130.63{\sim}175.23\;mg/100g$, respectively and followed by arginine ($7.00{\sim}10.49\;mg/100g$), phenylalanine ($4.70{\sim}13.88\;mg/100g$), and leucine ($5.98{\sim}10.26\;mg/100g$) in 10 cuts. $1^{++}$ grade Hanwoo steer beef had significantly higher IMP (Inosine monophosphate) and inosine in eye of round (30.04% and 6.25%) and top round (33.44% and 6.28%), while hypoxanthine contents were significantly higher in chuck tender than the other cuts (p<0.05). In fatty acid analysis, there were not significantly differences in fatty acid composition among 10 cuts only except for C16:1n7, C20:3n6, and C20:4n6 (p>0.05).

• Journal of Practical Agriculture & Fisheries Research
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• v.18 no.1
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• pp.13-24
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• 2016

Sixty Hanwoo steers(15 months of age; 409±29.2 kg of BW) were used to evaluate the effects of dietary vitamins A and D restriction on carcass characteristics. Steers were allotted randomly to 1 of 4 treatments: Control(diet supplemented with vitamins A, D and E), -A (diet supplemented with vitamins D and E), -D(diet supplemented with vitamins A and E) and -AD(diet supplemented with vitamin E only). Steers were fed the experimental diet for a period of 8 months(until 23 months of age), and then supplemented with vitamins A and D at 0.05% of the diet(as fed-basis) from 24 to 26 months of age, and at 0.1% of the diet from 27 to 31 months of age(harvesting time). Dietary restriction of vitamins A and D did not affect DM intake, daily gain and feed conversion ratio. But the concentration of serum retinol was significantly(P<0.05) decreased by vitamin A restriction with the lowest concentration being seen at 23 months of age(345.0 ㎍/L and 326.7㎍/L for control and -D treatment versus 169.3 ㎍/L and 175.4 ㎍/L for -A and -AD treatments). The serum concentration of 25(OH)D₃ was also decreased significantly(P<0.05) by vitamin D restriction and the lowest concentration was seen at 18 months of age(53.7ng/ml and 61.8ng/ml for control and - A treatment versus 24.0 ng/ml and 24.5 ng/ml for -D and -AD treatments). After the restriction period of vitamins A and D, the concentrations of retinol and 25(OH)D₃ for - A, -D and -AD treatments were recovered at those of control. Dietary restriction of vitamins A and D did not affect carcass weight, backfat thickness, ribeye area, quality grade and yield grade. But marbling score was significantly increased by vitamin A restriction compared with control(6.73, 6.87 and 5.73 for -A, -AD and control, respectively). The results of the present study suggested that dietary vitamin A restriction could improve marbling score in Hanwoo steers.

• Journal of The Korean Society of Grassland and Forage Science
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• v.39 no.4
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• pp.281-291
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• 2019

This study was carried out to investigate the effect of the feeding method of total mixed fermentation (TMF) and concentrate feed on the growth performance, carcass and meat characteristics of late fattening Hanwoo steers. Twenty-four Hanwoo steers were used in this study. The control group was fed with concentrate feed + rice straw from the growing to the late fattening period, while the T1 group was fed with TMF from the growing to the early fattening period and concentrate feed + rice straw for the late fattening period. The T2 group was fed with TMF from the growing to the late fattening period. The average daily gain (ADG) and feed conversion ratio (FCR) were not different between the treatment and control group. Serum cholesterol and high density lipoprotein (HDL) cholesterol concentrations were higher in the T2 groups than in the control group (p<0.05). The yield grade and quality grade were not different between the treatment and control group. The lightness of longissimus muscle was higher in the T1 group than in the control and T2 groups (p<0.05). Poly-unsaturated fatty acid (PUFA) of longissimus muscle was increased in the T2 groups than in the control group. Therefore, the method of feeding TMF and concentrate feed could have a positive effect on the lightness and fatty acid composition of longissimus muscle without affecting the growth and carcass grades of Hanwoo steers.

• Journal of Life Science
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• v.22 no.11
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• pp.1523-1528
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• 2012

In a previous proteomic study, heat shock protein beta 1 (HSPB1) was detected as differentially expressed protein in longissimus thoracis between low (grade 3) and high (grade 1++) meat quality groups by 2DE gel electrophoresis. The present study investigated an association of HSPB1 expression at the level of gene and protein with Warner-Bratzler shear force (WBS) measured in 20 Hanwoo steers. An analysis of variance (ANOVA) between expression values and WBS showed that WBS was affected by HSPB1 expression (p<0.05). The expression (at both gene and protein level) of the HSPB1 was 2 times higher in the low WBS group than that in the high WBS group (p<0.01). This result suggests that the HSPB1 gene may be a candidate gene associated with tenderness in longissimus thoracis of Korean cattle.