• Journal of Dairy Science and Biotechnology
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• 제28권1호
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• pp.17-28
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• 2010

A substantial body of evidence has emerged over the last decade in support of the novel concept that dietary calcium and dairy foods play an important role in regulating energy metabolism and thereby promote healthy weight management and reduce obesity risk. This concept has been demonstrated in experimental animals studies, cross-sectional and prospective population studies and a number of randomized clinical trials. Notably, the effects of dairy foods in weight management are more consistent than the effects of supplemental calcium across clinical trials, and calcium per se is responsible for approximately 40-50% of the effects of dairy. The calcium component is only effective in individuals with chronically low calcium intake, as it serves to prevent the endocrine response to low calcium diets which otherwise favors adipocyte energy storage; calcium also serves to promote energy loss via formation of calcium soaps in the gastrointestinal tract and thereby reduce fat absorption. The calcium-independent anti-obesity bioactivity of dairy resides primarily in whey. The key components identified to date are leucine and bioactive peptides resulting from whey protein digestion. The high concentration of leucine in whey stimulates a repartitioning of dietary energy from adipose tissue to skeletal muscle where it provides the energy required for leucine-stimulated protein synthesis, resulting in increased loss of adipose tissue and preservation of skeletal muscle mass during weight loss. Finally, dairy rich diets suppress the oxidative and inflammatory responses to obesity and thereby attenuate the diabetes and cardiovascular disease risk associated with obesity.

• Journal of Dairy Science and Biotechnology
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• 제38권1호
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• pp.27-36
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• 2020

The prevention of cognitive decline and dementia is an increasingly important global public health priority due to an increase in the percentage of the elderly population. Dementia, a severe cognitive disorder, not only negatively impacts the patients' quality of life but also creates a substantial burden for caregivers. This review introduced recent advances regarding the protective effects of dairy product intake against dementia and cognitive decline. Recent epidemiological studies have suggested that specific components of dairy products including bioactive peptides, colostrinin, proline-rich polypeptides, α-lactalbumin, vitamin B₁₂, calcium, and probiotics might promote healthy brain function during aging. Additionally, oleamide and dehydroergosterol in Camembert cheese have been suggested as agents capable of reducing microglial inflammatory responses and neurotoxicity. The intake of neuroprotective and anti-inflammatory compounds in meals is safe and easy, hence nutritional approaches, including dairy product consumption, serve as a promising intervention for the prevention of neurodegenerative disorders.

• 한국임상수의학회지
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• 제24권2호
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• pp.119-124
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• 2007

Milk components analysis was carried out milk yield(MY), milk fat(MF), milk protein(MP), milk urea nitrogen(MUN), milk solid(MS), day of non-pregnant condition(DNPC), and days of primipara(DPRI) involved. Dairy farms were divided high, middle and low groups according to the standard records for milk components. Examination records were divided by farm, parity, year, season and month, the number of samples were 28,957. MUN concentration was below 12 mg and when the MPP was below 3.0%, the days of non-pregnant condition were $94{\pm}10.77$ days but concentration of MUN was under 12 mg and when MPP was above 3.2%, longer period of non-pregnant condtion of $181.3{\pm}9.25$ was noted. The days of gestation of the first calving cow was $495.9{\pm}9.04$ days when the concentration of MUN was below 12mg/dl and MPP was under 3.0%. If the concentration of MUN was 12 mg/dl and when the MPP was over 3.2%, the days of gestation were $511.0{\pm}8.36$ days. It was believed that the concentrations of MPP and MUN have significant effects on the days of non-pregnant condition and the days of gestation. Determination of MY, MF, MS, and MUN was Milkoscan $4,000{\sim}5,000$ Serier(FOSS Electric Co., Copenhagen, Denmark). MUN standard concentration was 12-18(mg/dl) similar to blood urea nitrogen(BUN). Mutual relationship of milk components(MF, SCC, MY, DNPC, MS) and MUN concentration was low in regression analysis.

• Journal of Animal Science and Technology
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• 제65권1호
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• pp.57-68
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• 2023

Flavor is an important sensory trait of chicken meat. The free amino acid (FAA) and nucleotide (NT) components of meat are major factors affecting meat flavor during the cooking process. As a genetic approach to improve meat flavor, we performed a genome-wide association study (GWAS) to identify the potential candidate genes related to the FAA and NT components of chicken breast meat. Measurements of FAA and NT components were recorded at the age of 10 weeks from 764 and 767 birds, respectively, using a White leghorn and Yeonsan ogye crossbred F2 chicken population. For genotyping, we used 60K Illumina single-nucleotide polymorphism (SNP) chips. We found a total of nine significant SNPs for five FAA traits (arginine, glycine, lysine, threonine content, and the essential FAAs and one NT trait (inosine content), and six significant genomic regions were identified, including three regions shared among the essential FAAs, arginine, and inosine content traits. A list of potential candidate genes in significant genomic regions was detected, including the KCNRG, KCNIP4, HOXA3, THSD7B, and MMUT genes. The essential FAAs had significant gene regions the same as arginine. The genes related to arginine content were involved in nitric oxide metabolism, while the inosine content was possibly affected by insulin activity. Moreover, the threonine content could be related to methylmalonyl-CoA mutase. The genes and SNPs identified in this study might be useful markers in chicken selection and breeding for chicken meat flavor.

• 한국작물학회지
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• 제43권1호
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• pp.6-10
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• 1998

This study was conducted to obtain basic information on the development of new triticale cultivars with good quality and high productivity for soiling feed. Twelve cultivars introduced from Poland, Canada and two cultivars developed in Korea were planted in the experimental field at Ansong National University in 1995. Major growth traits and nutrient components for feed were measured and analyzed using principal component analysis and average linkage cluster analysis. 'Prego', 'Prag 46/3', and 'Clercal' were relatively high in forage yield. Most of forage nutrient contents except cellulose were higher in Prego, Clercal, and 'Cumulus' than other cultivars. Results of principal component analysis on 11 traits including forage yield and nutrient contents showed that 72.59% of total variation were explained by the first and second principal components. The Z$_1$ had high correlation with the contents of forage nutrient components and Z$_2$ with plant height, fresh, and dry weight. Fourteen cultivars were classified into 7 groups by multivariate analysis. Clercal and Prego in Group I could be useful source for the improvement of triticale as an important forage crop because they exhibited high productivity as well as high contents of nutrient components for feed.

• 한국수정란이식학회지
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• 제22권2호
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• pp.127-135
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• 2007

본 연구에서 Holstein 유우 78두로부터 분만 후 9주까지 1주 간격으로 혈액과 우유를 채취하여 cholesterol, glucose, 광물질(selenium, Ca, p), vitamin E 및 혈장내 progesterone을 분석하여, 이들 성분의 변화와 성분간의 상관 관계 및 변화 요인에 관하여 조사하였으며, 결과는 다음과 같다. 1. 분만 후 9주까지의 각 성분별 평균 수준은 혈액에서 cholesterol, glucose, selenium, Ca, P, vitamin E 및 BUN이 각각 78.8 mg/dl, 62.3 mg/dl, 8.9mg/dl, 7.4 mg/dl, 52.2 ng/ml, $10.3{\mu}g/l$ 및 16.3 mg/dl이었으며, MSe와 MUN은 15.3 ng/ml과 15.8 mg/dl이었다. 2. 혈액내 cholesterol, glucose, selenium, Vitamin E 및 MSe는 분만 후 시일 경과에 따라 증가되었다. 3. 성분간의 유의적 상관관계를 보면 cholesterol은 P와 부(-), selenium과 U과는 정(+)의 상관이 었고, glucose는 P, MSe와 정(+), P는 selenium 와 부(-) 상관이었으며 그리고 BUN과 MUN은 정(+) 상관을 나타내었다. 4. 성분 변화의 요인으로서 유우 나이는 glucose와 selenium, 산차는 selenium과 vitamin E, 유량은 glucose와 MSe 수준에 차이가 나타났으며 청초와 건초 급여간에는 혈액내 Ca와 selenium를 제외 한 성분에서 차이를 보였다. 요소태 질소에서는 MUN에서만 나이와 산차간에 차이가 있었다. 이상의 결과로 분만 후 급여 사료에 따라 혈액 및 우유의 성분에 차이를 보이며, 특히 혈액 및 우유내의 selenium은 분만 후 젖소에는 중요한 요소임을 확인할 수 있었다.

• Asian-Australasian Journal of Animal Sciences
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• 제24권3호
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• pp.330-335
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• 2011

The mode of inheritance of total milk yield and its genetic parameters were investigated in Churra dairy sheep through segregation analyses using a Monte Carlo Markov Chains (MCMC) method. Data which consisted of 7,126 lactations belonging to 5,154 ewes were collected between 1999 and 2002 from 15 Spanish Churra dairy flocks. A postulated major gene was assumed to be additive and priors used for variance components were uniform. Based on 50 000 Gibbs samples from ten replicates chains of 100,000 cycles, the estimated marginal posterior means${\pm}$posterior standard deviations of variance components of milk yield were $23.17{\pm}18.42$, $65.20{\pm}25.05$, $120.40{\pm}42.12$ and $420.83{\pm}40.26$ for major gene variance ($\sigma_G^2$), polygenic variance ($\sigma_u^2$), permanent environmental variance ($\sigma_{pe}^2$) and error variance ($\sigma_e^2$), respectively. The results of this study showed the postulated major locus was not significant, and the 95% highest posterior density regions ($HPDs_{95%}$) of most major gene parameters included 0, and particularly for the major gene variance. The estimated transmission probabilities for the 95% highest posterior density regions ($HPDs_{95%}$) were overlapped. These results indicated that segregation of a major gene was unlikely and that the mode of inheritance of total milk yield in Churra dairy sheep is purely polygenic. Based on 50,000 Gibbs samples from ten replicates chains of 100,000 cycles, the estimated polygenic heritability and repeatability were $h^2=0.20{\pm}0.05$ and r=$0.34{\pm}0.06$, respectively.

• Animal Bioscience
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• 제34권4호
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• pp.558-566
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• 2021

Objective: Objectives were to estimate energy and protein requirements of dairy crossbred steers, as well as to evaluate equations previously described in the literature (HH46 and CS16) to predict the carcass and empty body chemical composition of crossbred dairy cattle. Methods: Thirty-three Holstein×Zebu steers, aged 19±1 months old, with an initial shrunk body weight (BW) of 324±7.7 kg, were randomly divided into three groups: reference group (n = 5), maintenance level (1.17% BW; n = 4), and the remaining 24 steers were randomly allocated to 1 of 4 treatments. Treatments were: intake restricted to 85% of ad libitum feed intake for either 0, 28, 42, or 84 d of an 84-d finishing period. Results: The net energy and the metabolizable protein requirements for maintenance were 0.083 Mcal/EBW0.75/d and 4.40 g/EBW0.75, respectively. The net energy (NEG) and protein (NPG) requirements for growth can be estimated with the following equations: NEG (Mcal/kg EBG) = $0.2973_{({\pm}0.1212)}{\times}EBW^{0.4336_{({\pm}0.1002)}$ and NPG (g/d) = 183.6(±22.5333)×EBG-2.0693(±4.7254)×RE, where EBW, empty BW; EBG, empty body gain; and RE, retained energy. Crude protein (CP) and ether extract (EE) chemical contents in carcass, and all the chemical components in the empty body were precisely and accurately estimated by CS16 equations. However, water content in carcass was better predicted by HH46 equation. Conclusion: The equations proposed in this study can be used for estimating the energy and protein requirements of crossbred dairy steers. The CS16 equations were the best estimator for CP and EE chemical contents in carcass, and all chemical components in the empty body of crossbred dairy steers, whereas water in carcass was better estimated using the HH46 equations.

• Journal of Dairy Science and Biotechnology
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• 제31권2호
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• pp.127-131
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• 2013

The aim of this study was to investigate adulteration of caprine milk products by bovine milk using biomolecular techniques with bovine-specific primers for the mitochondrial cytochrome b gene. Polymerase chain reaction (PCR) and real-time PCR assays were applied to caprine milk products including infant formula, city milk, and fermented milk. The results indicated that six out of the eight caprine infant formula products tested contained bovine milk components. In addition, two of the three tested caprine city milk products and two caprine fermented milk products were shown to be adulterated with bovine milk. Conventional PCR results corroborated with results obtained by real-time PCR. This study demonstrates that DNA-based species identification procedures would be useful and applicable in routine examinations of the dairy industry to ensure the quality and safety of dairy foods.

• Journal of Dairy Science and Biotechnology
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• 제29권2호
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• pp.69-73
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• 2011

Food borne pathogens are a growing concern for human health and food safety throughout the world. Milk and dairy products are commonly associated with spoilage or contamination from a wide variety of physical, microbial, and chemical hazardous. Microbiological risk analysis consists of three components: risk assessment, risk management, and risk communication, and overall objective of this process is ultimately public health protection. The microbiological risk assessment is useful tool to evaluate food safety as it is based on a scientific approach. In addition risk assessment process includes quantitative estimation of the probability of occurrence of microbial hazards to evaluate more accurate human exposure. The aim of this study is to review the microbiological risk assessment on the prevalence of bacterial foodborne pathogens in milk and dairy products.