한국유기농업학회지 Vol.26 No.3 (p.515-532)

|Ⅱ. 자연과학편|
Effect of LED Lighting Time on Productivity, Blood Parameters and Immune Responses of Dairy Cows

LED 점등시간이 젖소의 생산성, 혈액 매개변수 및 면역 반응에 미치는 영향
키워드 :
blood parameters,holstein cow,immune function,LED lighting time,milk production

목차

Ⅰ. Introduction
Ⅱ. Materials and Methods
  1. Animals and Experimental Design
  2. Milk production and composition
  3. Blood sample collection and assay procedure
  4. Measurement of antioxidants and hormones in blood
  5. Statistical analysis
Ⅲ. Results and Discussion
  1. Milk Production
  2. Milk Composition
  3. Blood biochemical parameter analysis
  4. Enzymatic antioxidant
  5. Activities of Immunoglobulin (IgA & IgG) and Hormones
Ⅳ. Conclusion
References

초록

Light is an essential and powerful element to animals. A light-emitting diode (LED) is most efficient in terms of economic benefits. The aim of the present study was to evaluate the effects of LED lighting time on milk production, milk composition, and the immune response of Holstein cows. Forty lactating cows were assigned to four experimental groups: control; natural daylight, treatment; am3-6, pm6-12 and pm6-am6. We found that there was no significant effect on the decrease ratio in milk production among the groups. Milk urea nitrogen (MUN) was significantly decreased in pm6-am6 and pm6-12 than the control. With regard to the hemolytic biochemical analysis, GLU was significantly increased and CRE, T-BIL were significantly decreased in the pm6-12 than the control. IGF-1 levels were significantly increased in pm6-12 compared to other groups. Besides, cortisol was significantly lowered in the pm6-12 than the control, while prolactin, IgA and IgG were not significant among the groups. In addition, catalase and glutathione peroxidase were also significantly increased in pm6-12 than the control. However, antioxidant enzyme activity and superoxide dismutase were not significant among the experimental groups. Therefore, it was concluded that LED lighting time had some impact on blood parameters and immune responses in dairy cows without any changes in milk production.