Publications by authors named "Jun Sik Woo"
Objective: This study evaluated the effects of increased levels of dietary total digestible nutrient (TDN) and crude protein (CP) using protected fat (PF), soybean meal (SB), and heat-treated soybean meal (HSB) on performance, physiological parameters, and behavioral measurements of early-fattening Hanwoo steers under heat stress conditions.
Methods: Thirty-six steers (480.9 ± 58.
Objective: This study aimed to determine the effects of increasing energy and protein levels in diets by including protected fat (PF), glycerol (GL), and soybean meal (SBM) on growth performance, physiological parameters, carcass characteristics, and behavioral measurements of late-fattening Hanwoo steers under heat stress conditions.
Methods: Thirty-six steers (initial body weight, 724.9±58.
Objective: This study was conducted to assess effects of heat stress on growth performance, physiological parameters, and blood profiles of Hanwoo steers during early-fattening period in climate chambers.
Methods: Four Hanwoo steers (body weight, 454.3±10.
The accumulation, pathways, and sources of anthropogenic lead (Pb) in Ulleung Basin sediments were investigated based on the temporal and spatial variations in the Pb concentration and stable Pb isotopes for 21 dated box core sediments collected from the shelf, slope, and basin in the southern East/Japan Sea. Leached (1 M HCl) Pb concentrations and isotope ratios (Pb/Pb and Pb/Pb) were nearly constant before 1930, but have increased rapidly until the present. The primary source of anthropogenic Pb is considered to be atmospheric deposition, showing the signature of a mixture of leaded gasoline and coals, which was the major anthropogenic source in the basin.
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- The study aimed to assess how varying energy and protein levels in the diets of Hanwoo heifers impact their growth and behavior.
- Forty heifers were divided into three groups based on target daily weight gains of 0.2, 0.4, and 0.6 kg, while maintaining similar body weights and age, and their feed was adjusted accordingly to reduce hunger stress.
- Results showed that the actual daily weight gains exceeded predictions for all groups, with no significant behavioral changes despite longer eating times in the lower target gain group; regression equations for nutrient requirements were developed from the findings.
Objective: This study was conducted to evaluate nutritional value and in situ degradability of fruit-vegetable byproducts and their feeding effects on performance of growing Hanwoo steers.
Methods: Nutritional value and in situ degradability of cabbage, Chinese cabbage and fruit-vegetable byproducts were assessed. In vivo feeding trial was also performed for 12 weeks.