• 한국축산식품학회지
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• 제34권6호
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• pp.815-821
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• 2014

The effects of ultraviolet (UV) radiation were investigated with regards to the microbial growth inhibitory effect on the shelf life of Korean native cattle (Hanwoo) beef prior to refrigerated storage. The Hanwoo samples were exposed to UV radiation ($4.5mW/cm^2$) for 0, 5, 10, 15, and 20 min. The UV-irradiated beef that was exposed for 20 min showed significantly reduced mesophilic and psychrotrophic bacterial populations to the extent of approximately 3 log cycles, as compared to that of non-irradiated beef. About 2.5 Log CFU/g of mesophilic bacteria were different compared with UV-irradiated and non-irradiated meat. UV irradiation showed the most significant growth inhibition effects on mesophilic and psychrotrophic bacteria. Coliform and Gram-negative bacteria were also reduced by 1 log cycle. The population of L. monocytogenes, S. Typhimurium, and E. coli O157:H7 decreased significantly to 53.33, 39.68, and 45.76% after 10 min of UV irradiation. They decreased significantly to 84.64, 80.76, and 84.12%, respectively, after 20 min of UV irradiation. The results show that UV irradiation time and the inhibitory effect were proportional. These results verified that UV radiation prior to refrigeration can effectively reduce the number of pathogenic bacteria on the surface of meat and improve the meat's microbial safety.

• Journal of Animal Science and Technology
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• 제63권5호
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• pp.1064-1075
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• 2021

Recently, a high level of dietary crude protein (CP) has become of interest as a possible practice to improve the carcass quality of beef cattle, and its level has been increasing in the field. However, there is little scientific evidence that supports this. This study was conducted to test whether a high dietary CP level would improve growth performance, body metabolism, and carcass traits in Hanwoo beef cattle. A total of 32 Hanwoo finishing beef cattle (18 multiparous cows, six heifers, and eight steers) participated in a 12-weeks feeding trial. Two kinds of total mixed rations were prepared to contain two different CP; 156 g/kg for the control (CON) and 173 g/kg of CP for the treatment (HCP), while maintaining a similar level of metabolizable energy. The experiment was ended when more than half of the steers reached the target body weight (730 kg). Blood was collected at the end of the experiment. After harvesting, the carcass trait was evaluated at the slaughterhouse according to Korean standards. The carcass yield score and grade were also calculated based on revised criteria. Overall, dry matter intake, average daily gain, blood metabolites concentration, and the carcass traits, except for backfat thickness and the yield score, did not differ between the treatments. The HCP had lower backfat thickness than those of CON. There was no difference in the carcass yield grade, but the yield score was higher in the HCP treatment. According to the newly revised carcass grading criteria, both yield score and grade were higher in HCP than in CON. Increasing CP supply decreased the carcass's backfat thickness without altering growth performance and body metabolism, resulting in improved yield score and grade. Therefore, feeding a high CP diet may be beneficial in the farm income, although it may also increase feed cost and nitrogen excretion to the environment.

• 한국축산식품학회지
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• 제31권6호
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• pp.935-943
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• 2011

본 연구에서 거세한우(26-28개월) $1^+$, 1 등급육과 뉴질랜드산 냉장수입 육우로부터 채끝, 등심, 우둔, 꾸리부위를 공시시료로 이용하여 일반성분, 육색, 전단력, 가열감량, 지방산조성, 아미노산조성 및 무기물 함량을 비교하였다. 뉴질랜드산 흑우육은 채끝, 등심, 꾸리, 홍두깨 부위 모두 단백질 및 수분함량이 한우고기 $1^+$, 1 등급육보다 유의적으로 높았다(p<0.05). 반대로 근내지방함량은 뉴질랜드산 채끝, 등심, 꾸리부위가 한우고기 $1^+$, 1 등급육보다 유의적으로 낮았다(p<0.05). 육색은 뉴질랜드산 흑우육이 한우고기 $1^+$, 1 등급육과 비교했을 때 채끝과 홍두깨 부위의 $L^*$값(백색도)이 유의적으로 높았고 꾸리 부위의 $a^*$값(적색도) 및 $b^*$값(황색도)은 유의적으로 낮았다(p<0.05). 전단력은 채끝, 등심, 홍두깨 부위에서는 원산지간에 유의적인 차이가 없었으나 꾸리부위에서는 한우고기 $1^+$, 1 등급육이 뉴질랜드산 흑우육보다 전단력이 유의적으로 높았다(p<0.05). 뉴질랜드산 흑우육이 한우고기보다 4개 부위 모두에서 유의적으로 가열감량이 높은 것으로 분석되었다(p<0.05). 지방산 조성에서 뉴질랜드산 흑우육은 한우고기보다 C18:0 및 C18:3n3 함량이 유의적으로 높았고 C16:1n7 및 C18:1n9 지방산은 유의적으로 낮은 것으로 분석되었다(p<0.05). 특히 C18:2n6 지방산은 한우고기 $1^+$ 등급육이 4개 부위 모두에서 가장 높게 나타났다(p<0.05). 뉴질랜드산 흑우육은 한우고기 $1^+$, 1 등급육보다 포화지방산(SFA) 함량이 유의적으로 높은 반면에 단일불포화지방산(MUFA) 함량은 유의적으로 낮았다(p<0.05). 한편 n-3 계열 다가불포화지방산 함량은 뉴질랜드산 흑우육이 유의적으로 더 높았다(p<0.05). 아미노산 조성에서 aspartic acid, threonine, serine, alanine, valine, leucine, isoleucine, tyrosine, phenylalanine, lysine, histidine 함량은 채끝, 등심, 꾸리 및 홍두깨 부위 모두에서 뉴질랜드산 흑우가 유의적으로 높았다(p<0.05). Cystein, arginine과 proline 함량도 뉴질랜드산 흑우육이 한우고기 $1^+$, 1 등급육보다 채끝과 등심 부위에서 유의적으로 높았다(p<0.05). 무기물 조성 비교에서 뉴질랜드산 흑우육은 한우고기보다 채끝부위의 Ca 함량과 홍두깨 부위의 Zn 함량이 유의적으로 더 높았던 반면에 한우고기 1 등급육은 뉴질랜드산 흑우육보다 채끝과 꾸리 부위에서 Fe 함량이 유의적으로 더 높은 것으로 분석되었다(p<0.05). 결론적으로 한우육과 뉴질랜드산 수입흑우육은 부위에 따라 차이는 있었으나 전반적으로 한우육은 근내지방과 단일불포화지방산 함량이 높았고 뉴질랜드산 흑우육은 단백질함량과 아미노산함량이 상대적으로 더 높은 것으로 나타났다. 뉴질랜드 흑우육은 한우육보다 유통경로상 냉장숙성기간이 더 길었으나 전단력 수치를 비교한 결과 등심, 채끝등심, 홍두깨 부위의 연도는 차이가 없는 것으로 나타났다. 결론적으로 한우고기는 뉴질랜드산 흑우육보다 근내지방함량이 높고 특히 단일불포화지방산함량이 높았으며 뉴질랜드산 흑우육은 단백질함량과 아미노산함량이 높았다. 또한 뉴질랜드산 흑우육이 수입육 유통경로상 한우육보다 숙성기간이 더 길었음에도 불구하고 전단력 분석결과 등심, 채끝등심 및 홍두깨 부위의 연도에 있어서 한우육과 유의적인 차이가 없었고 가열감량이 적어 한우육이 뉴질랜드산 흑우육보다 숙성효과 및 육질이 우수한 것으로 분석되었다.

• 한국유기농업학회지
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• 제31권4호
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• pp.327-341
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• 2023

The Ministry of Agriculture, Food and Rural Affairs, Hanwoo Association and Nonghyup have discussed proactive reduction measures for cows in response to concerns about an oversupply of hanwoo to ensure supply stability. This study aims to empirically analyze whether the cow fattening support program is being implemented in line with its objectives. Based on the analysis of beef traceability data, the slaughter age of participating cows was reduced by 7.6 to 14.7 months compared to non-participating cows. And heifer was reduced 1.5 months in their slaughter age. In case of parity, participating cows showed a reduction of 1.4 compared to non-participating cows. Through the SUR model, an analysis was conducted to examine the effect of the cow fattening support program on the suppression of calf production numbers. The analysis results showed that the calf production numbers are positively influenced by the number of fertile cow and the quantity of semen sales. Furthermore, it is estimated that calf production decreased as the fat index increased, and during the period when the cow fattening support program was implemented, an average monthly suppression of 3,558 calves was observed.

• Asian-Australasian Journal of Animal Sciences
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• 제27권9호
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• pp.1328-1335
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• 2014

Significant SNPs associated with Warner-Bratzler (WB) shear force and sensory traits were confirmed for Hanwoo beef (Korean cattle). A Bonferroni-corrected genome-wide significant association (p< $1.3{\times}10^{-6}$) was detected with only one single nucleotide polymorphism (SNP) on chromosome 5 for WB shear force. A slightly higher number of SNPs was significantly (p<0.001) associated with WB shear force than with other sensory traits. Further, 50, 25, 29, and 34 SNPs were significantly associated with WB shear force, tenderness, juiciness, and flavor likeness, respectively. The SNPs between p = 0.001 and p = 0.0001 thresholds explained 3% to 9% of the phenotypic variance, while the most significant SNPs accounted for 7% to 12% of the phenotypic variance. In conclusion, because WB shear force and sensory evaluation were moderately affected by a few loci and minimally affected by other loci, further studies are required by using a large sample size and high marker density.

• 한국축산식품학회지
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• 제28권5호
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• pp.629-636
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• 2008

본 연구는 비육기 이전에 초지에서 방목한 한우육과 옥내에서 비육한 한우육의 품질을 비교하고자 실시하였다. 방목사육구는 $28{\pm}4$개월령 암소 5두를 7개월 동안(4월-11월)방목한 다음 다시 6개월 동안 옥내에서 비육하였으며, 옥내사육구는 6개월령 거세우 10두를 24개월 동안 옥내에서 비육하였다. 시료로 등심(M. longissimus)부위를 채취하여 $4{\pm}0.2^{\circ}C$에서 7일 동안 저장하였다. 도체성적은 방목우의 도체중, 지육율, 배최장근단면적 및 육질등급이 옥내사육우보다 낮았으나(p<0.05), 조직감 및 성숙도는 방목우가 높았다(p<0.05). 조지방 및 n-6 지방산, n-6/n-3은 방목우가 낮았으나(p<0.05), n-3 지방산, 포화지방산은 방목우가 높았다(p<0.05). pH 및 보수력은 방목우가 낮았으며(p<0.05), 전자코에 의한 향기패턴은 두 처리구들간에 뚜렷한 차이를 보였다. 저장중 품질은 방목우의 지방 및 육색소 산화안정성이 낮았으며, 옥내사육 우보다 어둡고 덜 붉은 육색을 나타내었다.

• 한국축산식품학회지
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• 제30권4호
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• pp.685-694
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• 2010

The present study investigated the combined effects of modified atmosphere packaging (MAP) and organic acid salts on the quality and shelf-life of Hanwoo ground beef patties. The ground beef containing 500 ppm of ascorbic acid was prepared with air-packaging (Air-P), high oxygen-MAP (70% $O_2$+30% $CO_2$/OxyMAP), and nitrogen-MAP (100% $N_2$/NitroMAP), in combination with organic acid salts (1500 ppm of sodium acetate and 500 ppm of calcium lactate). The samples were stored for 11 d at $5^{\circ}C$. The pH value of ground beef patties decreased during storage in all the treatments. The ground beef patties with organic acid salts showed relatively higher level of pH during storage compared with non-added patties (p<0.05). Lipid oxidation was accelerated in OxyMAP while it was delayed in NitroMAP treated with organic acid salts. Nitro-MAP treated with organic acid salts was effective in stabilizing the color characteristics of lightness (CIE $L^*$) and redness (CIE $a^*$) during storage. Oxygen content in MAP was shown to be a more important factor affecting color stability and lipid oxidation of ground beef than organic acid salts. The aerobic and anaerobic bacterial counts were reduced both in OxyMAP and NitroMAP (p<0.05), and the lactic acid bacteria was inhibited by Oxy-MAP (p<0.05). Coliform bacteria decreased during storage as pH value was decreased in all treatments. According to the sensory evaluation, the ground beef patties in NitroMAP showed the best quality among all treatments during storage. Therefore, Hanwoo ground beef patties added with sodium acetate and calcium lactate and packed with NitroMAP showed better quality characteristics than other treatments. This packaging method is recommended and could be utilized for packaging hanwoo ground beef patties for improving quality and extending shelf-life.

• 한국축산식품학회지
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• 제33권3호
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• pp.390-394
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• 2013

The aim of this study was to determine the optimal storage condition of pre-packed Hanwoo beef without freezing. Hanwoo loin was purchased from a local distributor at 48 h after slaughter, then sliced in $1.5{\pm}0.5$ cm thickness, and packed in a polyethylene (PE) tray covered with linear low-density polyethylene (LLDPE) film. The studied factors to set the optimal storage condition were chamber temperature (5, 2.5 and $-1^{\circ}C$ for 14 d), cooling method (direct and indirect cooling system), and ultraviolet (UV) light irradiation for beef surface sterilization (0, 30, 60, and 120 min). The changes of pH, thiobarbituric acid reactive substances (TBARS) and number of aerobic bacteria were measured during storage. Beef samples stored in $-1^{\circ}C$ showed the minimal increasing rate in TBARS and microbial growth. After 15 d of storage, there was no significant difference in pH and TBARS values. However, the microbial population of beef stored in direct type cooling chamber ($4.25{\pm}0.66$ Log CFU/g) was significantly lower than that of beef stored in indirect type chamber ($6.47{\pm}0.08$ Log CFU/g) (p<0.05). After 4 d of storage, 60 or 120 min UV light irradiated beef samples showed significantly lower microbial population, and at 14 d of storage, 60 min UV irradiated beef sample showed significantly lower microbial population ($3.14{\pm}0.43$ Log CFU/g) than control ($4.46{\pm}0.13$ Log CFU/g) (p<0.05). However, TBARS values of 60 or 120 min UV light irradiated beef samples were significantly higher than non-irradiated beef sample after 4 d of storage (p<0.05).

• 한국축산식품학회지
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• 제38권4호
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• pp.679-692
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• 2018

The effects of high-pressure processing (HPP) treatment on the quality characteristics of low graded Hanwoo beef marinated with five different sauces (soy, fish, fish-soy, soy-fish and fish-soy-meat sauces) obtained from Asian countries were studied. The Hanwoo beef striploins were marinated with the aforementioned sauces (at ratio: 3:1 w/w) for 3 days at $4^{\circ}C$ before they were treated with HPP at 550 MPa for 5 min at $10^{\circ}C$. All the sauces used were equalized to a same salt level of 12.5%, and the samples marinated with a 12.5% brine solution were served as a control. After treating with the HPP, all the samples were stored for further 7 days at $4^{\circ}C$ for analyses. Results revealed that HPP treatments showed some effects on technological quality traits (pH, cooking loss and color) but had no effect on the collagen contents of the marinated beef. Noticeably, the HPP treatment led to the increases in amounts of free amino acids associated with monosodium glutamate-like taste and sweet taste in the samples marinated with fish sauce or soy-fish sauce, fish-soy sauce and fish-soy-meat sauce whereas, it only reduced these amino acids in the samples marinated with soy sauce or control. Furthermore, the total bacteria count in all the marinated beef samples treated with HPP were significantly (p<0.05) lower than those of the non-HPP-treated samples throughout the storage periods. It is concluded that HPP could be applied for enhancing the taste-active compounds production such as free amino acids, and improving the shelflife stability of the marinated beef.

• 한국축산식품학회지
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• 제27권2호
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• pp.244-249
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• 2007

본 연구는 비육한우 32두(거세우 16두, 암소 16두)를 대상으로(C-1구 거세우에게 일반사료 : C-2구 암소에게 일반사료 : T-1구 거세우에게 쑥 2% 첨가 : T-2구 암소에게 쑥 2% 첨가) 4개 처리구를 두고 14개월간(생후 14개월-27개월) 비육시험한 결과는 다음과 같다. 등심부위의 전단력과 보수성은 T-1구($3.20kg/0.5inch^2$, 54.32%)가, 가열감량은 C-2구(22.22%)가 다른 처리구보다 크게 높았다(p<0.05). 관능검사의 다즙성, 연도 및 향미는 처리구가 대조구보다 높은 경향을 보였고, 그 중에서도 T-1구(5.50점-5.20점)가 가장 높게 나타났다. Catechin 성분에서 총 카테킨 및 에피카테킨 성분은 처리구(0.43-0.46 mg/kg, 0.056-0.065 mg/kg)가 대조구(0.23-0.25 mg/kg, 0.031-0.032 mg/kg)보다 더 높게 나타났다. 지방산 조성에서 oleic acid은 47.56-48.45% 정도, palmitic acid은 28.86-29.67%, stearic acid는 9.92-10.82%, palmitoleic acid 및 myristic acid는 4.68-5.49%와 2.48-3.89%의 범위로서 처리간에 유의차가 없었다. 이상의 시험결과로 볼 때, 거세한우에 대한 쑥첨가는 육질의 관능검사(다즙성, 연도, 향미) 및 이화학적 특성(전단력, 보수성)에서 크게 향상되었다.