In recent years, the consumption of livestock products were markedly decreased by awareness of world-widely occurred diseases including mad cow disease, Foot and mouth disease, Hog cholera, and Poultry Influenza virus. The consumers are also wanting to have highly safe food such as organic animal products because of concerning about residual of antibiotics in animal products. However, disease control and impairment of productivity are the major problem in organic animal production. On these points of view, the present study was undertaken to investigate the effects of 1% or 2% of dietary probiotics fortified with various minerals on improvement of egg production and egg quality in old layer feeding low quality feed mainly composed of food waste, sesame meal, and rice bran. After 4 weeks of experimental feeding, the diameter of spreading of egg white was clearly decreased from 11.2cm of control eggs to 10.5m and 10.1m in 1% and 2% treatment group eggs, respectively. The color of egg yolk was 9.3 in control eggs but remarkably increased in treatment groups showing 10.1~10.2. Egg production was 75.8% in control layers but significantly increased to 79.8% of 1% treatment group and 82.9% of 2% treatment group layers. Egg weights (C : 66.3g, 1% : 73.2g, and 2% : 76.7g) and egg shell thickness (C : 0.33㎜, 1% : 0.35㎜ and 2% : 0.36㎜) were also increased by the addition of 1% or 2% of probiotics when compared to those of control group eggs. All together, it has been suggested that dietary addition of probiotics fortified with various minerals can improve the egg quality and egg production in layer"s productivities by the recycling of organic waste resources such as food waste and agricultural by-products.

N-Methylpurine-DNA glycosylase (MPG)는 DNA에서 N-methylpurine과 다른 손상된 purine기를 제거하는 DNA 회복 효소이다. 생쥐의 임신 8일 후의 태아조직부터 생후 400일까지의 조직들로부터 RT-PCR 방법으로 MPG mRNA 발현을 조사하였다. MPG mRNA는 태아 형성기동안 많은 양이 발현되었으며, 특히 15일에서 가장 높게 발현되었다. 태반에서의 MPG mRNA는 8 p.c. (post coitum)