초록
적색 carotenoid인 canthaxanthin의 급여가 산란계육과 난황의 착색도 변화에 미치는 효과를 알아보고자 63주령 갈색 산란계(ISA Brown) 225수를 가지고 5주 동안 사양실험을 실시하였다. Canthaxanthin을 5수준으로 사료에 첨가하여 5처리(0, 50, 100, 200, 300mg/kg)로 하였으며, 처리당 3반복, 반복당 15수를 사용하였다. 산란계에서 날개피부 및 다리피부의 적색도는 200mg/kg 이상을 급여하였을 때, 그리고 황색도의 경우 날개피부는 50mg/kg 이상, 다리피부는 200mg/kg 이상을 급여하였을 때 유의적으로 높았다(P＜0.05). 그러나 명도는 날개, 가슴 및 다리피부에서 차이가 없었다. 한편, 날개육과 가슴육의 명도는 300mg/kg 이상을 사료에 첨가(canthaxanthin)시 무첨가구와 유의적인 차이를 보였으나(P＜0.05), 적색도와 황색도는 첨가구간에 차이가 없었다. 난황색(Roche color fan score)은 canthaxanthin 급여 1일에는 차이가 없었으나, 첨가수준에 관계없이 2일째부터 첨가구가 무첨가구보다 유의적으로 높았다(P＜0.05).
A total of 225 ISA Brown layers, 63-wk-old, were used in a 5-wk feeding trial to measure the effect of dietary canthaxanthin(0, 50, 100, 200, and 300mg/kg feed) on its accumulation in various body parts and the egg yolk. There were three replications per treatment and 15 birds per replication. The redness(a$\^$*/) and yellowness(b$\^$*/) of wing and thigh skin significantly(P＜0.05) increased when canthaxanthin was fed at 2200 and 250mg/kg feed, respectively. However, the color of breast skin was not significantly affected by the canthaxanthin supplementation. Skin lightness(L$\^$*/) was not influenced by the dietary canthaxanthin. The dietary canthaxanthin supplementation did not significantly affect the redness or the yellowness of breast and thigh muscles. However, feeding canthaxanthin at 300mg/kg, compared to the control(0mg/kg feed), significantly(P＜0.05) decreased the lightness of wing and breast muscles. Feeding of canthaxanthin for 1-3d also significantly increased the color of egg yolks. In conclusion, canthaxanthin can be used to improve the color of skin and egg yolks, but it should be used cautiously because too intense egg yolk redness could be rejected by consumers.
