• Journal of Animal Science and Technology
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• v.64 no.1
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• pp.143-154
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• 2022

This study was conducted to evaluate the relationship among market weight, slaughter age, yield grade, and primal cut yield in Hanwoo. A total of 403 Hanwoo (Korean native cattle) was assessed for carcass traits such as carcass cold weight, backfat thickness, ribeye area, dressing percentage, yield index, and marbling score. The production yield of the individual major primal cuts of Hanwoo beef was also measured. Carcass cold weight, ribeye area, and backfat thickness, which affect meat quality increased with increased market weight (p < 0.05). The production yield of the ten major primal cuts also increased with increased market weight (p < 0.05). In terms of slaughter age, carcass cold weight, ribeye area, and backfat thickness all increased from 25 months to 28-29 months, and the production yield of all prime cuts also increased with increasing slaughter age. According to the meat yield grade, carcass cold weight and backfat thickness increased from grade A to grade C, although the ribeye area was not affected. The combined findings of the study suggest that slaughtering Hanwoo at the weight of 651-700 kg and 701-750 and age of 28.23 and 29.83 months could be desirable to achieve the best quality and quantity grade of Hanwoo beef. However, the positive correlation of carcass cold weight and backfat thickness, and the negative correlation of the yield index according to primal cuts yield indicated that it is necessary to couple the slaughtering management of cattle with improved genetic and breeding method of Hanwoo to increase the production yield of the major prime cuts of Hanwoo beef.

• Korean Journal of Agricultural Science
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• v.44 no.4
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• pp.574-585
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• 2017

This study was conducted to investigate effects of a potato byproduct on growth performance, blood metabolites, and carcass characteristics of Hanwoo steers. The palm oil coated potato byproduct was supplemented to the diet of Hanwoo steers to estimate the effect on growth performance, blood metabolites, and carcass characteristics during the late fattening period. Thirteen steers with initial body weight of control ($676.8{\pm}31.7kg$), treatment 1 ($671.8{\pm}46.2kg$) and treatment 2 ($672.8{\pm}31.1kg$) were used for 60 days, respectively. Average daily gain of steers in treatment 2 and control was greater than that in treastment 1 (p > 0.05). All steers in treatment 2 had a grade quality grading system than B in meat quantity and had a meat quality higher than the $1^{st}$ grade. According to the physicochemical analysis of longissimus muscle, treatment 2 had high brightness resulting from high meat quality (p > 0.05), and a decrease in redness and yellowness is seen as a dilution effect due to muscle hypertrophy (p > 0.05). The fatty acid composition showed low levels of linoleic acid (p = 0.039) and arachidonic acid (p = 0.008) in treatment 2. This resulted in lower polyunsaturated fatty acid (PUFA) levels (p = 0.034). On the other hand, high levels of oleic acid resulted in high levels of MUFA (p > 0.05). These results indicate that potato byproduct had similar effects with ${\beta}_2-adrenergic$ agonist (${\beta}_2-AA$). And there was no negative effect on the intramuscular fat. In conclusion, palm oil coated potato byproduct could be potentially used as an alternative growth enhancer.

• Journal of Animal Science and Technology
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• v.55 no.5
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• pp.443-449
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• 2013

To develop a diet for Hanwoo steers during the late fattening phase, three different feeding treatments were investigated: a group fed concentrate and rice straw separately (Formula feed), a group fed TMR during the whole late fattening period (TMR), and a group fed TMR plus concentrate (Formula-TMR). Thirty Hanwoo steers 20 months of age (average body weight = 445 kg) were allotted by a completely randomized design into three treatment groups (ten steers in each group). The impact of these treatments on the performance, carcass traits, and blood composition related to body fat synthesis was assessed. The average dry matter and TDN intake were greater in Formula-TMR compared to other treatments (p<0.05); however, body gain, carcass weight, meat production index, and fat color were not affected by dietary type. Blood characteristics, such as concentrations of retinol, insulin, and leptin were not affected by any of the treatments; however the marbling score of the longisimus muscle was significantly higher in Formula-TMR (p<0.05), which was relatively high in blood leptin concentration. The muscle texture, meat quantity index, and meat quality index were highest in the Formula feed, TMR, and Formula-TMR, respectively (p<0.05).

• Korean Journal of Agricultural Science
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• v.10 no.2
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• pp.393-405
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• 1983

The demand for livestock and poultry products including beef, pork, chicken, egg and milk whose income elasticities are relatively higher than other staple foods, has been increased significantly during the past two decades in response to the remarkable increase in per capita GNP. This trend will be continued during the fifth and the sixth five year economic development plan period beginning with 1982. The annual GNP growth rate will be 7.5% on the average during the next 10 years. It is greatly needed to estimate the demand for beef, pork, chicken egg and milk and to study the feasibilities of domestic production of livestock products for the formulation of adequate policies in order to equate the consumption and the production during the 1980s. So this study reviewed the possible changes in the food consumption patterns during the 1980s, estimated the demand for beef, pork, chicken, egg and milk by using empirical demand functions and finally made suggestions for the formulation of long term price stabilization policies for each livestock, poultry and dairy products through the equilibrium of the quantity of demand for and supply of the products. There are many factors affecting the demand for meats, but this study considered own price, prices of supplements and substitutes and per capita income as the independent variables in the demand equations. It was found that it's own price and income were most significantly affecting factors among others and the degree of substitution effects were remarkably different among the products. According to the meat demand derived in this study, per capita consumption of beef, pork and chicken in the base year 1982 was 11.2kg for total meat, 2.5kg beef, 6.0kg pork and 2.5kg chicken, 106 pieces egg, 15.1kg milk respectively, while those in 1991 were 19.3kg for total meat, 4.8kg beef, 9.6kg pork, 4.9kg chicken, 133pieces egg and 44.1kg milk. It is also predicted through this study that, when the level of production costs be maintained, the domestic production of pork and chicken will meet the demand for them during the fifth and sixth five year economic plan period. However, there will be chronic shortage of beef supply during the coming years. The annual import requirement will be 30,000tons to 40,000tons during the period. In order to stabilize the domestic livestock and poultry and dairy products market, the government should introduce measures to curb the increase in beef consumption by encouraging the consumption of pork and chicken. For this, the livestock production policy measures should be concentrated on : 1) the improvement of infrastructures of beef production by introducing advanced feeding and management technology, subsidies for the establishment of facilities and price support programs for farmers : 2) the development of dairy beef : 3) the reinforcement of the forecast systems for pork and chicken production and consumption.

• Journal of Animal Science and Technology
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• v.49 no.4
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• pp.531-538
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• 2007

A total of 127 Korean native black pigs(gilt 30, boar 97) were used to investigate the carcass properties, yields of retail cut and meat quality. The average live weight, chilled carcass percentage and retail cut percentage used in this study were 74.69kg, 71.14% and 61.09% for boar, and 75.5kg, 73.88% and 56.25% for gilt, respectively. Although gilts were higher in live weight and chilled carcass percentage whereas lower in retail cut percentage when compared to boars, there was no significantly difference between gender(p<0.05). Gilts had higher fat contents than boars regardless of weight range groups. Protein contents increased as slaughter weight increased for gilt and boar groups. Gilts contained high intramuscular fat contents had significantly lower Warner-Bratzler shear force(WBS) and water holding capacity(WHC) when compared to boar in the same weight range group(p<0.05). There was no significantly different in meat color(p>0.05) although gilts had higher L(lightness), a(redness) and b(yellowness) values when compared to the same group of boar. From the result of this study can be used for the grading guideline and quality evaluation standard of Korean native black pigs by gender and live weight.

• Korean Journal of Food Science and Technology
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• v.30 no.4
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• pp.823-826
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• 1998

It has been reported that alginic acid hydrolysate retains antimicrobial activity but the enzyme which hydrolyze alginic acid is not developed for industrial use. The authors developed chemical method for hydrolyzing alginic acid. For preparing alginic acid hydrolysate, equal quantity of alginic acid and ascorbic acid were added to water. Then the solution was heated at $121^{\circ}C$ for $20{\sim}30{\;}minutes$. The 4% solution of alginic acid hydrolysate was revealed relative viscosity 1.05, pH 3.2 and opaque whitish-yellow color. By addition of this hydrolysate to nutrient broth with the concentration of 0.1%, the growth of Bacillus sp. isolated from fish meat paste products was inhibited. The fish meat paste products containing 0.3% alginic acid hydrolysate prepared were prolonged their shelf life by 1 day stored at $30^{\circ}C$, 2 days at $20^{\circ}C$ and 4 days at $15^{\circ}C$.

• Asian-Australasian Journal of Animal Sciences
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• v.14 no.11
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• pp.1555-1559
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• 2001

In the first study of a series of experiment samples were taken from 11-13th rib of Hungarian Simmental (HS, n=22) and Holstein-Friesian (HF, n=18) cull cows. In the second one, that of females (n=15) and males (n=12) of HF breed was analysed for amino acid composition, and biological value (BV) of proteins. No significant influence of either breed or slaughter weight was established in this study. Thus, the essential amino acid content and biological value of the proteins in Hungarian Simmental breed are practically the same as in the Holstein-Friesian. On the other hand, gender proved to be a significant factor influencing the amino acid profile of beef proteins, as the quantity of essential amino acids turned out to be significantly larger in females than in males. No statistical difference could be established for the non-essential amino acids and BV between the two genders.

• Journal of the East Asian Society of Dietary Life
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• v.22 no.4
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• pp.463-472
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• 2012

This study was performed to investigate the iron status and its related factors in female college students residing in Gyeongnam. The prevalence of iron deficiency among subjects ranged from 3.4% in mean corpuscular hemoglobin concentration (MCHC) to 43.7% in ferritin. Weight, lean body mass (LBM) and body mass index (BMI) were positively correlated with ferritin concentration, but negatively correlated with total iron binding capacity (TIBC). Among the nutrients, vitamin A and B2 were major predictors of elevated iron status. Meal regularity was positively correlated with Fe and ferritin concentration, and meal number with transferrin saturation (TS), meal quantity with red blood cell (RBC) and hematocrit (Hct). Consumption of fruit, meat, fish and poultry showed strong positive correlation with hematological indices. Therefore, increasing vitamin A, B2, C, and iron intakes as well as maintenance of a healthy weight may be helpful in preventing iron deficiency in female college students.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.27 no.5
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• pp.454-461
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• 1994

This studies was carried out in order to investigate the browning reaction of lipid originated compound with nitrogenous compound in dried conger eel. The major fatty acids were $C_{16:0},\;C_{16:1},\;C_{18:1},\;C_{20:5}\;and\;C_{22:6}$. The nonpolar lipid contained the highest percentage of $C_{16:0}$, while the polar lipid contained the highest percentage of $C_{22:6}$. The browning reaction there was a rapidly developed with the beginning of the decline in carbonyl value and remarkable decrease in polyunsaturated fatty acids such as $C_{20:5},\;C_{22:5},\;C_{22:6}$ compared with the other fatty acid, in the water soluble fraction of the browning product obtained from tile fish was detected some antioxidation activity but in the lipid soluble fraction which covers most of the browning reactions in the fish meat antioxidation activity was not detected. In the test of conger eel oil, the phosphatidylcholine was largest in quantity and browning products provided in this experiment showed very low reducing activity.

• Journal of the East Asian Society of Dietary Life
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• v.12 no.6
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• pp.447-488
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• 2002

The annals of the Chosun dynasty (朝鮮王朝實錄). on CD-ROM was studied to understand e ceremony and dietary culture of the Chosun dynasty. The Chunshin (薦新) ceremony. the service of offering the first food product of the year to ancestors, was begun in the Song dynasty in China and initiated in the Koryo dynasty in Korea. Chunshin ceremony as the national auspicious ceremony was settled through the 311 the Chosun dynasty. The offerings were graded and the Saongwon (司饔院) was in charge of the transportation of them. A king attended the ceremony in person at Jongmyo (宗廟) once in a while. but the Bongsangsi officials usually took charge of ceremony. Even though the harvest of crops had failed due to the drought. the quantity of the offering was not curtailed. Seven kinds of the new products It ere offered in the Koryo dynasty, twenty-seven kinds of them during the reign of king Sejong, and thirty-one kinds of the them during the reign of King Sungjong according to the Gukjooreeui (國朝五禮儀) (1474). The offerings were served on the utensils called Du (두(豆)), Byun (遼), and Jak (爵). Most of the of the offerings were dedicated by public officials and civilians. The meat products in particular were caught by the king on hunting trips, and offered by the king in Person.