• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.11
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• pp.435-442
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• 2020

This study was conducted to investigate the effect of different raising periods (24 and 48 months) on the physico-chemical quality and fatty acid composition of meat from Korean native black goats. In terms of proximate composition, the meat from the 24-month age-group of the goats contained lower moisture and protein content and higher fat and ash content than that from the 48-month age-group. With an increase in age, moisture and protein content increased, whereas fat and ash content decreased. The pH was higher as was the cooking loss in the meat from the 24-month age-group than in the meat from the 48-months age-group (p < 0.05). However, there was no significant difference in the water-holding capacity and shear force of the meat from the two breeding periods (p > 0.05). A color analysis showed that the meat from the 24-month age-group had higher L*, a*, and b* values than the 48-month age-group (p < 0.05). The fatty acid composition and palmitic acid content increased with an increase in rearing periods, whereas stearic acid and oleic acid content decreased. The proportion of saturated and unsaturated fatty acid content was lower and higher, respectively, at 24 months of age and 48 months of age (p < 0.05).

• Journal of Embryo Transfer
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• v.20 no.3
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• pp.255-269
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• 2005

This study was aimed to investigate genetic relationships, variables, and correlations between economic traits and metabolic materials in serum components according to bleeding periods and breeding locations for the castrated and not castrated Hanwoo cattle at National Livestock Research Institute. Analysis of variance for serum hormones and metabolic materials showed significant differences by breeding locations except for testosterone and globulin. Statistical differences for serum components were detected by birth year except for cortisol, total protein, globulin and creatinine, and by castration except for total protein and BUN. All the serum components were tended to have sire effects except for testosterone resulting in some degree of additive gene actions. Breeding locations showed statistical significances for carcass weight and back fat thickness, but not in carcass rate, KPH, live weight and transportation weight loss. Effects of breeding locations and castration were significant for all weight measurement periods except for 9 month and 6 month, respectively. A significant sire effect was observed in all weight measurements. Least squared means for concentration of serum components by breeding year, season and castration were not significant. High concentration of cortisol, creatinine and triglyceride and low concentration of IGF-1 and glucose were detected in castrated cattle. Concentration of testosterone with castrated cattle was $5.2\%$ corresponding to non castrated cattle. Estimation of heritabilities of serum components using a sire model with restricted maximum likelihood were ranged 0.07 to 0.58. High heritabilities were estimated for total protein, albumin, globulin, cortisol, creatinine and BUN were 0.53, 0.54, 0.42, 0.45, 0.58 and 0.54, respectively. Low heritabilities were estimated fur calcium, testosterone and IGF-1 for 0.07, 0.15 and 0.12, respectively. Heritabilities for carcass weight, back fat thickness, meat yield index, KPH, and IMF were estimated as 0.39, 0.45, 0.30 0.13, and 0.93. Heritabilities of weights on 18, 12, 9, 6, and 24 month were estimated as 0.78, 0.76, 0.62, 0.58 and 0.58. Estimated heritabilities for average daily gain on 6${\~}$2, 12${\~}$18, and 18${\~}$24 month were 0.80, 0.75 and 0.19, respectively.

• Korean Journal of Poultry Science
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• v.29 no.4
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• pp.255-258
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• 2002

A study was conducted to investigate the correlation of cecal anaerobic bacterial counts with the cecal length in growing chicks. Half of 160 chicks of five weeks old were housed in cages and the remainings were kept with goats in free-range and allowed to have free access to goat's feed and faeces. All the experimental birds were fed ad libitum on a commercial chick formula diet during the period of 5 to 12 weeks of age. Body weight was larger in birds reared in the cage than in those reared on the field at 8 weeks of age (P<0.05), but vice versa at the end of experiment (P<0.05). The cecal length was longer in field-rearing than in cage-rearing at 6, 9, 10 and 11 weeks of age (P<0.05). The cecal length was correlated with body weight gain in both rearing groups (r=0.816 f3r cage-rearing, r=0.816 for field-rearing). The cecal anaerobic bacterial counts were significantly higher in field- rearing than in cage-rearing at 6, 9, 10 and 11 weeks of age (P<0.05). The cecal length was highly correlated with cecal anaerobic bacterial counts in cage- (r=0.9549) and field-(r=0.9866) rearing. It is concluded that the correlation of increase cecal length with increased cecal anaerobic bacterial counts ted a libelous of goat's faeces in growing chicks.

• Korean journal of applied entomology
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• v.57 no.3
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• pp.165-175
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• 2018

Insects are known to live at wide range of temperature, but can not survive when they are exposed to over $40^{\circ}C$ or below supercooling point. The larvae of Helicoverpa assulta have been reared at high ($35^{\circ}C$), low (3 to $10^{\circ}C$), and room temperature ($25^{\circ}C$; control). To identify stress-related genes, the transcriptomes of fat body have been analyzed. Genes such as cuticular proteins, fatty acyl ${\Delta}9$ desaturase and glycerol 3 phosphate dehydrogenase were up-regulated whereas chitin synthase, catalase, and UDP-glycosyltransferase were down-regulated at low temperature. Superoxide dismutase, metallothionein 2, phosphoenolpyruvate carboxykinase and trehalose transporter have been up-regulated at high temperature. In addition, expressions of heat shock protein and glutathione peroxidase were increased at high temperature, but decreased at low temperature. These temperature-specific expressed genes can be available as markers for climate change of insect pests.

• Proceedings of the Korean Society of Developmental Biology Conference
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• 2003.10a
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• pp.88-88
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• 2003

수정란 이식의 성공적 수행을 위해서는 양질의 수정란 생산, 영양상태가 양호한 수란우의 선발, 수정란과 수란우의 발정동기화, 황체발육이 양호한 수란우의 선발과 숙련자에 의한 수정란의 이식 등의 제반사항이 최적으로 이루어 졌을 때에 가능하다고 사료된다. 특히 수란우의 영양상태는 각양각색이라 판단하기가 어렵다. 따라서 본 연구에서 수란우의 사양관리 형태가 수란우 선발율과 수태율에 미치는 영향을 조사하여 수정란 이식의 효율증진을 도모하고자 실시하였다. 본 실험에 공시된 수란우는 경기도 일원에서 사육하고 있는 젖소 미경산우를 대상으로 하였으며, 건초와 농후사료 급여군(A군)과 볏짚과 농후사료 급여군(B군)으로 나누어 조사하였다. 실험에 공시한 수정란은 능력이 우수한 5∼7산의 한우 경산우에 과배란처리 후 비외과적 방법을 이용하여 회수한 수정란을 이용하였다. 또한 수란우는 발정동기화 처리 후 황체상태가 양호한 개체만을 시험에 공시하였다. (중략)

• Proceedings of the KSAR Conference
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• 2003.06a
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• pp.91-91
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• 2003

소의 생산성 향상을 위해서는 번식효율의 증진과 개체의 유전능력을 충분히 발휘할 수 있도록 적절한 사양관리를 실시하여야 한다. 특히 번식관리는 발정관찰로부터 출발하며 발정관찰의 원활한 수행이 없이는 좋은 번식성적을 기대할 수 없다. 그러나 발정관찰은 많은 시간과 노동력이 요구되며 이로 인하여 발정관찰방법과 보조기구가 개발되어 시판되고 있다. 본 연구는 발정관찰의 편리성과 정확성을 개선하고자 (주)한경게놈텍에서 개발한 무인발정관리시스템(HMS)을 활용하여 발정발현양상을 분석하였다. 실험에 공시된 시험축은 안성인근 지역에서 사육되는 35두의 홀스타인 경산우를 선발하였으며, 발정주기에 관계없이 무작위로 선발하여 미근부에 감지센서를 부착하고 감지시간을 0.1초 이상으로 설정하여 매직닥터를 설치하였다. 발정감지횟수와 감지시간의 분석은 승가허용 감지시간이 0.5초 이상인 것만을 승가허용으로 간주하고 분석하였다.

• Korean Journal of Veterinary Service
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• v.42 no.4
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• pp.177-181
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• 2019

Q fever is a zoonosis caused by Coxiella burnetti that is important not only for livestock but also for humans. This research aims to investigate infection rate of Q fever by examining the prevalence of antibody titers in cattle in Sejong City. From March to October 2018, 505 samples of Hanwoo serum and 47 samples of bulk-tank milk were collected and analyzed using ELISA. According to the result, 25 (53.2%) out of 47 bulk-tank milk samples were antibody positive and 28 (5.5%) out of 505 cows were antibody positive. The seroprevalence of C. burnetii increased with age (<1 y=0%, 1~2 y=4.1%, 3~5 y=7.5%, ≥6 y=9.6%) and was higher in females (6.5%) compared to males (0%).

• Korean Journal of Veterinary Research
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• v.27 no.1
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• pp.109-115
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• 1987

Fecal samples collected from 1,424 cattle were examined for the presence of Coccidia species. A total of eleven species of Eimeria was identified; among the species identified as above E. bovis and E. zuernii appeared with relatively higher infection rates. The infection rate was most prevalent in Korean native cattle (29.07%), followed by the imported beef cattle (18.41%) and the dairy cattle (11. 99%). The number of species within positive samples ranged from one to four.

• 월간낙농육우
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• v.29 no.1
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• pp.96-102
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• 2009

최근 육우 산업동향을 보면 육우 경락가격이 미산쇠고기 협상타결(08.4.18) 이후 25% 가까이 하락하였고, 사료값 폭등으로 생산비까지 급증하면서 두당 100만원 이상 적자를 보는 상황으로 분석되었다. 이에 따라 육우농가들이 육우사육을 포기하거나 한우로 전환하면서 수요처를 상실한 육우송아지 가격이 80% 이상 폭락하여 이에 따른 낙농가의 경영난 또한 심각한 상황으로 나타났다. 협회는 지난해 8월 1일 개최한 '육우산업 생존전략 방안 마련을 위한 전문가 간담회'에 이어 12월 10일(수) 축산회관 소회의실에서 '육우(송아지) 가격폭락 대책마련을 위한 전문가 간담회'를 개최하였다. 이날 간담회에서는 정부가 한우산업에 편중된 정책에서 벗어나 육우도 국내산 육자원으로 인정하고 육우 송아지생산안정제, 육우 가격지지 등 보다 실질적이고 즉각적인 대책을 마련해야 한다는 전문가 의견이 제시되었다. 월간 "낙농육우"는 본고를 통해 이날 간담회에 참석한 전문가들의 발언을 요약 정리해 보았다.

• Proceedings of the Korean Society of Grassland Science Conference
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• 1998.04a
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• pp.63-94
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• 1998

반추동물에게 조사료는 일정량 이상은 반드시 급여하여야 하나 우리나라에서는 노동력 부족과 기계보급이 저조하여 조사료 생산이 절대적으로 부족한 실정에 있다. 따라서 많은 농가에서는 볏짚과 농후사료 위주의 사양을 하고 있으며 부족한 부분은 도입 조사료에 의존하고 있는 실정이다. 특히 조사료에 비하여 농후사료의 이용비율이 높은 우리의 실정으로 볼 때 IMF의 구제금융 지원에 따른 환율의 급등은 도입사료 곡물가격의 상승으로 우리나라 축산업의 기반을 약화시키고 있다. 소 사육을 위해서는 양질조사료 생산이 필수적이므로 우리의 유휴 농경지를 이용하여 보다 값싼 조사료를 많이 생산하여 경쟁력 있는 축산물을 생산하는 것만이 이 어려운 시기를 극복할 수 있을 것으로 생각된다. 양질 조사료 생산은 그 지역에 가장 적합한 사료작물을 선정하고 가장 합리적인 작부체계를 이용하여 단위 면적 당 생산량을 최대로 높이고 농가의 경영형태에 알맞은 이용계획을 수립하여야 한다.(중략)