Kwang-Seok Ki
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View article: Effects of dry period length on milk production and physiological responses of heat-stressed dairy cows during the transition period
Effects of dry period length on milk production and physiological responses of heat-stressed dairy cows during the transition period Open
The objective of this study was to investigate the effects of a traditional dry period (60 d) versus a no dry period (0 d) on the milk production, physiological response, and metabolic status of dairy cows exposed to heat stress during the…
View article: Monitoring of Biometric Information such as Activity and Rumination Time for Advancement of Estrus Detection in Dairy Cows
Monitoring of Biometric Information such as Activity and Rumination Time for Advancement of Estrus Detection in Dairy Cows Open
최근 IoT (Internet-of-Things) 기술의 발달로 다양한 생체정보 측정 기기들이 개발되어 축산 현장에서 발정발현 확인용으로 활용되고 있다. 하지만, 발정발현의 정확도가 기기마다 차이가 있고, 가축에서의 표현형과의 차이 등으로 인해 실제 번식효율 개선 등의 효과는 제한적인 실정이다. 본 연구는 생체정보 장치 유래 데이터를 기반으로 젖소의 발정주기 진행에 따른 활동량(Activity, AT)과 반추시간(Rumina…
View article: Changes in milk production and blood metabolism of lactating dairy cows fed Saccharomyces cerevisiae culture fluid under heat stress
Changes in milk production and blood metabolism of lactating dairy cows fed Saccharomyces cerevisiae culture fluid under heat stress Open
In this study, Saccharomyces cerevisiae culture fluid (SCCF) has been added to a diet of lactating dairy cows to attempt to improve the ruminal fermentation and potentially increase the dry matter intake (DMI) and milk yield. This study wa…
View article: Effects of photoperiod and light intensity on milk production and milk composition of dairy cows in automatic milking system
Effects of photoperiod and light intensity on milk production and milk composition of dairy cows in automatic milking system Open
The purpose of this study was to determine the effects of photoperiod and light intensity on milk production, milk composition, hormones levels and blood metabolites indices of Korean Holstein dairy cows in automatic milking system (AMS). …
View article: Evaluation of heat stress responses in Holstein and Jersey cows by analyzing physiological characteristics and milk production in Korea
Evaluation of heat stress responses in Holstein and Jersey cows by analyzing physiological characteristics and milk production in Korea Open
We evaluated the effects of heat stress on physiological responses and milk production in Holstein and Jersey cows reared in Korea. The mean average temperature-humidity index (THI) increased significantly from May to August and then decre…
View article: Evaluation of the equation for predicting dry matter intake of lactating dairy cows in the Korean feeding standards for dairy cattle
Evaluation of the equation for predicting dry matter intake of lactating dairy cows in the Korean feeding standards for dairy cattle Open
Objective: This study aimed to validate and evaluate the dry matter (DM) intake prediction model of the Korean feeding standards for dairy cattle (KFSD).Methods: The KFSD DM intake (DMI) model was developed using a database containing the …
View article: Effects of Replacing Corn with Hydroponically Sprouted Barley on the Growth Performance and Blood Metabolite Status of Holstein Dairy Heifers
Effects of Replacing Corn with Hydroponically Sprouted Barley on the Growth Performance and Blood Metabolite Status of Holstein Dairy Heifers Open
This study aimed to determine the effects of replacing corn with hydroponically sprouted barley (HSB) in Holstein heifer feed on growth performance and blood metabolites. For this purpose, the barley was prepared with hydroponic sprouting …
View article: A comparative study on milk composition of Jersey and Holstein dairy cows during the early lactation
A comparative study on milk composition of Jersey and Holstein dairy cows during the early lactation Open
Recently, Jersey cattle was introduced and produced by embryo transfer to Korea. This study was conducted to investigate the differences of milk compositions between Jersey and Holstein cows and the relationship between days in milk (DIM) …
View article: The effect of seasonal thermal stress on milk production and milk compositions of Korean Holstein and Jersey cows
The effect of seasonal thermal stress on milk production and milk compositions of Korean Holstein and Jersey cows Open
Objective: In this study we investigated the effect of seasonal thermal stress on milk production and milk compositions between Holstein and Jersey dairy cows under the temperateclimate in Korea.Methods: A total of 9 Holstein lactating dai…
View article: Preparation of Nanoemulsions of Vitamin A and C by Microfluidization: Efficacy on the Expression Pattern of Milk-Specific Proteins in MAC-T Cells
Preparation of Nanoemulsions of Vitamin A and C by Microfluidization: Efficacy on the Expression Pattern of Milk-Specific Proteins in MAC-T Cells Open
In this study, we prepared stabilized vitamin A and C nanoemulsions, and investigated their efficacy on milk-specific proteins in bovine mammary epithelial cells (MAC-T). Emulsions of vitamin A (vit-A) and C (vit-C) were prepared using Lip…
View article: Effect of sodium stearoyl-2-lactylate supplementation on lactation performance, blood-biochemical profile, and economic efficacy of mid-lactation Holstein cows
Effect of sodium stearoyl-2-lactylate supplementation on lactation performance, blood-biochemical profile, and economic efficacy of mid-lactation Holstein cows Open
The milk sales revenue related to SSL supplementation of the TRT 0.1 diet was increased by up to 5.4% compared to the milk sales revenue of the CON diet. Therefore, 0.1% SSL supplementation might be effective and profitable during the mid-…
View article: The effect of nanoemulsified methionine and cysteine on the in vitro expression of casein in bovine mammary epithelial cells
The effect of nanoemulsified methionine and cysteine on the in vitro expression of casein in bovine mammary epithelial cells Open
Detailed knowledge of factors, such nanogenesis of methionine, associated with increasing cysteine and decreasing production of genetic markers related to milk protein (casein) will help guide future recommendations to producers for maximi…
View article: Effect of optimal sodium stearoyl-2-lactylate supplementation on growth performance and blood and carcass characteristics in Hanwoo steers during the early fattening period
Effect of optimal sodium stearoyl-2-lactylate supplementation on growth performance and blood and carcass characteristics in Hanwoo steers during the early fattening period Open
Our study suggests that a TDN 0.5% down spec with 0.1% SSL supplemented feed may be effective and profitable for the early fattening period of Hanwoo steers without causing adverse effects.
View article: Comparison of bacterial communities in leachate from decomposing bovine carcasses
Comparison of bacterial communities in leachate from decomposing bovine carcasses Open
Our results indicated that the composition of bacterial communities in leachates of a decomposing bovine shifted continuously during the experimental period, with significant changes detected after 4 months of burial.
View article: 315 Vitamin C induces PRDM16 of bovine muscle-derived cells isolated from semimembranosus and longissimus dorsi tissues
315 Vitamin C induces PRDM16 of bovine muscle-derived cells isolated from semimembranosus and longissimus dorsi tissues Open
Vitamin C (VC) supplements have been used for enhancing marbling fat in high-quality beef cattle. However, mode of action of VC was not clearly studied for a long time. The aim of this experiment was to determine the effect of VC dose titr…
View article: 314 A high-roughage diet alters performance, carcass characteristics, and adipogenic gene expression of bovine longissimus thoracis
314 A high-roughage diet alters performance, carcass characteristics, and adipogenic gene expression of bovine longissimus thoracis Open
Three groups of calf-fed steers were used to evaluate the effects of control (100% concentrate), Italian rye grass (IRG) silage (ad libitum with 66% concentrate), and IRG hay (ad libitum with 66% concentrate) on adipogenic gene expression …
View article: The effect of lactation number, stage, length, and milking frequency on milk yield in Korean Holstein dairy cows using automatic milking system
The effect of lactation number, stage, length, and milking frequency on milk yield in Korean Holstein dairy cows using automatic milking system Open
Detailed knowledge of these factors such as lactation number, stage, length, and milking frequency associated with increasing milk yield using AMS will help guide future recommendations to producers for maximizing milk yield in Korean Dair…
View article: Novel Acinetobacter parvus HANDI 309 microbial biomass for the production of N-acetyl-β-d-glucosamine (GlcNAc) using swollen chitin substrate in submerged fermentation
Novel Acinetobacter parvus HANDI 309 microbial biomass for the production of N-acetyl-β-d-glucosamine (GlcNAc) using swollen chitin substrate in submerged fermentation Open
The excellent thermostability and hydrolytic properties may give the exo-chitinase great potential in chitin to GlcNAc conversion in industry. This is the first report that A. parvus HANDI 309 is a novel bacterial strain that has the abili…
View article: Evaluation of the nutritional value of locally produced forage in Korea using chemical analysis and in vitro ruminal fermentation
Evaluation of the nutritional value of locally produced forage in Korea using chemical analysis and in vitro ruminal fermentation Open
Objective The use of locally produced forage (LPF) in cattle production has economic and environmental advantages over imported forage. The objective of this study was to characterize the nutritional value of LPF commonly used in Korea. Di…