earticle

영어

Weaning stress is the most common issue in weanling pigs, and increases diarrhea and mortality. Various wavelengths of light irradiation affect the body owing to the association with biophotons. Biophotons are very weak photons in the visible light range generated during metabolic and chemical reactions in vivo. Immune mechanisms are activated by increasing signal transmission between cells through biophoton emission. This study evaluated the influence of ultra-weak light (LED) on growth performance, antioxidant status, and stress of weaned piglets. A total of 120 weaned pigs with an average initial body weight of 7.04±0.01 kg (age: 21 d) were allotted to two treatments (Control and LED) with 10 replicates. Diets prepared in pellet form were administered to the pigs in three phases including Phase 1 (0–14 d), Phase 2 (15–28 d), and Phase 3 (29–42 d). At the end of the study, the average daily gain (8.96%, p<0.05) and feed efficiency (6.56%, p<0.05) of pigs was significantly increased at phase 3 in the LED treatment. Low concentration of malondialdehyde (12.58%, p<0.05) and high concentrations of glutathione reductase (7.41%, p<0.01) and total antioxidant capacity (5.48%, p<0.05) were observed in the LED treatment at Day 42. The concentration of hair cortisol was also decreased (24.05%, p<0.05) in the LED treatment at Day 42. In conclusion, the use of LED for weanling pigs is recommended to improve growth performance by modulating antioxidant capacity and cortisol level in hair.

한국어

광조사의 다양한 파장이 생체에 영향을 미치는데 생체 내 대사 및 화학반응 시 생성되는 가시광선의 극미약광 은 세포 간 신호 전달을 증가시켜 면역 기전이 활성될 수 있다. 본 연구는 이유자돈의 사양성적, 산화효소 및 스트레스에 대한 극미약광(LED)의 영향을 알아보기 위해 실시되었다. 이유자돈(Landrace×Yorkshire×Duroc, 21일령 7.04±0.01kg) 120두를 공시하였고, 시험 기간은 이유 후 3 단계로 나눠 총 6주간 진행하였다(Phase 1(0-14d), Phase 2(15-28d), Phase 3(29-42d)). 처리구는 Control과 LED로 두 가지로 진행하였으며, 10반복, 반복당 6두씩 배치하였 다. 연구 결과, LED 처리에 따라 Phase 3에서 일당증체 량 8.96% 증가 및 사료효율 8.93% 개선되었으며, Overall 에서 사료효율 6.56% 개선되었다. Malondialdehyde (MDA) 12.58%, glutathione reductase(GR) 7.41%, total antioxidant capacity(TAC) 5.48% 감소로 항산화효소 활 성이 개선되었다. 또한 Phase 3에서 LED 처리에 따라 Hair cortisol의 농도가 감소하였다(24.05%, p<0.05). 본 연구결과로 극미약광 조사는 이유자돈의 성장과 항산화 활성 및 스트레스를 개선하는데 도움이 되는 것으로 판단된다.