• Journal of Animal Science and Technology
• /
• 제47권2호
• /
• pp.233-242
• /
• 2005

Effects of supplemental charcoal powder and vitamin A on growth performance, serum profile and carcass characteristics with 24 Hanwoo steers were inves$\ell$ated. The Hanwoo steers were randomly assigned to one of the three dietary treatments: 1) Control(commercial feed), 2) Tl(commercial feed supplemented with 2% charcoal powder and 0.2 % vitamin A), 3) T2(commercial feed with 2 % charcoal powder). In the age 26 month, body weight of control Tl and T2 were 633.8 kg, 621.0 kg, 619.4 kg, respectively, with not significantly different(P> 0.05). The daily weight gain of control was the highest followed by Tl and T2. The contents of vitamin A(retinol) and total cholesterol in the blood of Tl was higher Tl(56.32 $\ell$ / dt, 163.83 mg/ dz) than the other treatment groups(P < 0.05). The average of WBC value in the blood was 6.86-" 9.83 k / ${\mu}\ell$, RBC value was 7.98 - 11.26 k / ${\mu}\ell$ and blood platelet was 236.7 - 287.0 k / ${\mu}\ell$. But The serum profile in blood was not significantly different between control and treatment groups. The carcass grade and characteristics of all treatments in Hanwoo steers were not significantly different except the texture.

• 한국축산식품학회지
• /
• 제37권3호
• /
• pp.440-448
• /
• 2017

This study was conducted to establish the shelf life of $1^{++}$ grade Hanwoo beef by evaluating the changes in meat quality and storage stability under distribution conditions similar to those during export to Hong Kong and China. Four muscles of the loin, striploin, tenderloin, and top round muscles were obtained from 10 animals of $1^{++}$ grade Hanwoo steers. The distribution conditions were 0, 7, or 14 d of aging at $2^{\circ}C$ and continuous storage at $-18^{\circ}C$ for 0, 3, 6, or 9 mon. The lightness (CIE $L^*$) values decreased as the duration of freezer storage increased (p<0.05). The water-holding capacity of 4 muscles increased as the aging time increased when they were frozen for 3 mon (p<0.05). The cooking loss values of the four muscles were significantly increased as the duration of freezer storage increased (p<0.05). The Warner-Bratzler shear force values were significantly decreased in the loin, striploin, and top round muscles as the aging time increased (p<0.05). The changes in volatile basic nitrogen (16.67-18.49 mg%) and thiobarbituric reactive substance values (0.75-0.82 mg MA/kg meat) were significantly increased when the meat was frozen for 9 mon after 14 d of aging. On the basis of these observations, the shelf life of $1^{++}$ grade Hanwoo beef during distribution should be limited to less than 9 mon of freezer storage at $-18^{\circ}C$ after 14 d of aging at $2^{\circ}C$.

• 생명과학회지
• /
• 제21권12호
• /
• pp.1705-1709
• /
• 2011

본 실험에서는 새송이버섯 수확 후 배지 발효산물 첨가급여가 한우 거세우의 성장과 도체성적에 미치는 영향을 조사하기 위하여 비육기(17-24개월령) 한우 거세우 32두를 공시하여 30개월령까지 사양시험을 수행하였다. 공시동물은 30%의 새송이버섯 수확 후 배지 발효산물(F-SMS)이 첨가된 TMR 사료를 급여한 처리구와 시판 배합사료와 볏짚을 분리 급여한 대조구로 나누어 처리구별로 각각 16두씩 배치하였으며 한 우리($5{\times}6m$)당 4두씩 수용하였다. 30%의 F-SMS가 첨가된 TMR 사료의 영양 가치를 분석한 결과, 30%의 F-SMS가 첨가된 TMR 사료는 볏짚보다는 조단백질(11.67%)과 TDN(72.11%) 함량이 높게 나타났으나 시판배합사료와는 큰 차이가 없었다(p<0.05). 시험기간 동안 사료섭취량은 30%의 F-SMS가 첨가된 TMR 사료 급여구가 대조구보다 유의적으로 많았으나(p<0.05) 공시동물의 증체량에서는 처리구간에 큰 차이가 없었다. 육질등급에서는 30%의 F-SMS가 첨가된 TMR 사료 처리구(100%)의 1등급 이상 출현율이 대조구(87.5%)보다는 높게 나타났으나 육량등급에 있어서는 처리구별로 큰 차이가 없었다(p<0.05). 이상의 결과로 볼 때, Bacillus amyloliquefaciens CS47와 Saccharomyces cerevisiae로 발효시켜 기호성과 저장성이 개선된 새송이버섯 수확 후 배지는 한우 거세우의 원료사료로 사용 가능한 것으로 사료된다.

• 한국동물생명공학회지
• /
• 제38권3호
• /
• pp.158-166
• /
• 2023

Background: Copy number variation (CNV) can be identified using next-generation sequencing and microarray technologies, the research on the analysis of its association with meat traits in livestock breeding has significantly increased in recent years. Hanwoo is an inherent species raised in the Republic of Korea. It is now considered one of the most economically important species and a major food source mainly used for meat (Hanwoo beef). Methods: In this study, CNVs and the relationship between the obtained CNV regions (CNVRs) can be identified in the Hanwoo steer samples (n = 473) using Illumina Hanwoo SNP 50K bead chip and bioinformatic tools, which were used to locate the required data and meat traits were investigated. The PennCNV software was used for the identification of CNVs, followed by the use of the CNV Ruler software for locating the different CNVRs. Furthermore, bioinformatics analysis was performed. Results: We found a total of 2,575 autosomal CNVs (933 losses, 1,642 gains) and 416 CNVRs (289 gains, 111 losses, and 16 mixed), which were established with ranged in size from 2,183 bp to 983,333 bp and 10,004 bp to 381,836 bp, respectively. Upon analyzing the restriction of minor alleles frequency > 0.05 for meat traits association, 6 CNVRs in the carcass weight, 2 CNVRs in the marbling score, 3 CNVRs in the backfat thickness, and 2 CNVRs in the longissimus muscle area were related to the meat traits. In addition, we identified an overlap of 347 CNVRs. Moreover, 3 CNVRs were determined to have a gene that affects meat quality. Conclusions: Our results confirmed the relationship between Hanwoo CNVR and meat traits, and the possibility of overlapping candidate genes, annotations, and quantitative trait loci that results depended on to contribute to the greater understanding of CNVs in Hanwoo and its role in genetic variation among cattle livestock.

• Asian-Australasian Journal of Animal Sciences
• /
• 제18권2호
• /
• pp.209-213
• /
• 2005

This study was conducted to determine the optimum substitution level of dried leftover food (DLF) in formula feed for Hanwoo (Korean Native Cattle) steers. A total of forty growing steers were assigned to 5 treatments based on substitution level of DLF (at 0, 25, 50, 75 and 100% level of formula feed). The experiment was carried out with growing steers from 6 months of age to 24 months of age. Average daily gain (ADG) was not affected by DLF substitution level up to 75% of formula feed. However ADG decreased at 100% substitution level. Daily feed intakes were similar among treatments but the amount of feed per 1 kg gain increased with increasing substitution level of DLF. Dressing percentage was around 62% in all treatments without any significant differences. Proportion of quality beef higher than grade 1 was the greatest from animals fed 25% substitution level of DLF. Economic efficiency for Hanwoo steer operator was the highest with 50% substitution level of DLF.

• 한국축산식품학회지
• /
• 제37권5호
• /
• pp.780-786
• /
• 2017

The objective of this study was to investigate the relationship between muscle fiber characteristics, intramuscular fat (IMF) content, and fatty acids composition in longissimus lumborum (LL) muscle from Hanwoo steers. The LL muscles were obtained from four quality grades (QG) carcasses and subjected to histochemical analysis. There were significant (p<0.05) differences in fiber number percentage (FNP) and fiber area percentage (FAP) of muscle fiber types among muscles from four QGs. Both FNP and FAP of type I increased while those of type IIB decreased with increasing QG from QG 2 to QG $1^{{+}{+}}$ (p<0.05). Also, with increasing QG, the saturated fatty acid (SFA) proportion decreased while monounsaturated fatty acid (MUFA) increased significantly (p<0.05). IMF content was positively correlated with both FNP and FAP of type I, but negatively correlated with those of type IIB. The proportions of SFA and MUFA were significantly (p<0.001) correlated with both type I and IIB composition. These results implied that muscle fiber type composition is an important factor influencing fatty acid composition in LL muscle of Hanwoo steer.

• Journal of Animal Science and Technology
• /
• 제47권2호
• /
• pp.283-292
• /
• 2005

This study was conducted to determine the effect of dietary supplements of mineral(pegmatite) powder on the growth performance and meat quality during 14 month in 24 heads of Hanwoo steers. The Hanwoo steers were randomly allotted 3 treatments(8 heads I treatment); Control(0 %), Tl(supplemented with pegmatite 2.0% and vitamin A 0.2 %), T2(supplemented with pegmatite 2.0 %). The body weights of control, Tl and T2 were 646.2 kg, 624.0 kg and 656.8 kg on 26 month respectively. The daily gain was higher in T2(0.87 kg) than the others. The concentration of vitamin A(retinol) in the blood serum in T1(61.75 $\ell$ I dl) was higher than' control(41.93$\ell$ I dl) and T2(46.10mg I dl)(P < 0.05). The concentration of total cholesterol was lowest in TI (130.17mgI di) than the others(P< 0.05). Marbling scores and meat quality grade were to significnatly higher in T2(5.50 and 3.50) than control(2.71 and 1.83) and Tl(3.00 and 2.00)(P< 0.05).

• 농업과학연구
• /
• 제48권4호
• /
• pp.975-985
• /
• 2021

The sufficient amount of protein supply is crucial for improving the growth performance of growing beef cattle. In addition, due to the improvement in the genetic potential of the carcass weight of Hanwoo steers, dietary protein requirements may be increased during the rapid growth period. Accordingly, the dietary crude protein (CP) level in growing Hanwoo steers has been increasing in the field. However, little scientific evidence is available in relation to this. Therefore, this study was conducted to test whether a higher dietary CP level than convention would improve the growth performance and body metabolism in growing Hanwoo steers. Fifty growing Hanwoo steers were randomly divided into two groups and fed either a commercial diet (CON) or a higher CP (HCP) concentrate mix, provided with a similar level of dietary energy. Tall fescue hay was provided ad libitum. The dietary CP level did not affect growth performance and blood metabolite. Nitrogen intake, predicted nitrogen excretion, and retained nitrogen were higher in the HCP group than in the CON group (p < 0.01). Although there was no difference in the nitrogen utilization efficiency, the growth efficiency per retained nitrogen decreased in the HCP group (p = 0.02). A higher dietary CP level may increase nitrogen retention in growing Hanwoo steers without improving growth performance, which leads to reduced growth efficiency per retained nitrogen. Furthermore, considering the high price of feed protein and increased nitrogen excretion to the environment, a further increase in the protein level may not be sustainable.

• Asian-Australasian Journal of Animal Sciences
• /
• 제33권7호
• /
• pp.1202-1208
• /
• 2020

Objective: The aim of this study was to identify a distribution pattern of meat quality grade (MQG) as a function of carcass yield index (CYI) and the gender of Hanwoo (bull, cow, and steer) to determine the optimum point between both yield and quality. We also attempted to identify how pre- and post-deboning variables affect the gender-specific beef quality of Hanwoo. Methods: A total of 31 deboning variables, consisting of 7 pre-deboning and 24 post-deboning variables from bulls (n = 139), cows (n = 69), and steers (n = 153), were obtained from the National Institute of Animal Science (NIAS) in South Korea. The database was reconstructed to be suitable for a statistical significance test between the CYI and the MQG as well as classification of meat quality. Discriminant function analysis was used for classifying MQG using the deboning parameters of Hanwoo by gender. Results: The means of CYI according to 1+, 1, 2, and 3 of MQG were 68.64±2.02, 68.85±1.94, 68.62±5.88, and 70.99±3.32, respectively. High carcass yield correlated with low-quality grade, while high-quality meat most frequently was obtained from steers. The classification ability of pre-deboning parameters was higher than that of post-deboning parameters. Moisture and the shear force were the common significant parameters in all discriminant functions having a classification accuracy of 80.6%, 71%, and 56.9% for the bull, cow, and steer, respectively. Conclusion: This study provides basic information for predicting the meat quality by gender using pre-deboning variables consistent with the actual grading index.

• 한국초지조사료학회지
• /
• 제29권4호
• /
• pp.375-382
• /
• 2009

본 시험을 수행하기 위해서 6개월령 거세한 우 64두를 공시하여 주구는 조사료원으로 목건초와 볏짚 처리구를 배치하였으며, 세구는 출하시기로 24개월, 26개월, 28개월 및 30개월 배치하였다. 본 시험은 조사료원 및 출하시기별 발육 및 육질에 미치는 영향을 구명하기 위하여 수행하였다. 발육 및 사료이용성은 목건초 급여구가 볏짚 급여구에 비하여 동일 출하월령에서 10~12% 정도 더 발육이 향상되었으며(p<0.05), 배합사료 요구량에서도 목건초 급여 구가 볏짚 급여구에 비하여 kg 증체당이 향상 되는 결과를 얻었다. 또한 도체등급에서도 등 지방두께 및 배최장근단면적은 출하월령이 증가할수록 증가하였으며, 근내지방도 역시 출하월령이 증가할수록 증가하는 경향을 보였다. 따라서 한우 고급육을 생산하기 위해서는 볏짚 보다는 목건초 급여로 출하시기를 28개월령 이상 사육하는 것이 바람직한 것으로 사료된다.