Study On The Changes Of The Nutrition Elements In Different Period Incubation Embryonated Eggs

Enbryonated eggs which are fertilized eggs after incubation in which embyos continuous grow. During the incubation, there are great changes of the nutrition elements in enbryonated eggs. In this paper, different hatching period enbryonated eggs were chosen as raw material and then the content of protein、the molecular weight of protein、fat、cholesterol、 water-solution vitamin、hormone、metal iron and taurine in different embryonic ages were detected to invest the changes of the nutrition elements above during the whole incubation period. After that, parts of the embryonic age eggs were boiled by different time and then detect some kinds of the content of the thermal instability nutrition elements. The main results are as following:1. The protein in embroynated eggs was gradually increased during the incubation period, compared to the fresh eggs, the protein content in18th embryonic age increases20%; the molecular weight of protein in embrynated eggs mainly focused between30-100KDa, the content of which upper than100KDa reduced gradually and there is no significant changes of which lower than12KDa. The content of fat decreases slowly during the whole incubation, compared to fresh eggs, its content decreased15%at18th embryonic age.2. The results showed that the cholesterol in embroynated eggs was decreased continuous dramatically after the14th embryonic age, when at the18th embryonic age, the content reduced55%; the amount of folic acid reached the top at the12th embryonic age, which increased100%compared to the fresh eggs then decreased fast; the content of niacin increased during the incubation period and increased270%at18th embryonic age; the content of taurine appears a rapid increase after12th embryonic age and reaches the top at18th age.3. Estrone、estratiol、estriol and progesterone turned up at mid-term of the hatching period and then increased, when reach to18th embryonic age, progesterone、estrone、estratiol and estriol increased2.5times、40%、3.8%、and9.8%、respectively. There is no significant changes of testosterone、methyltestosterone、norethindrone and cortisol during incubation.4. The eggshell provide part of metal iron for embryo which is essential to its growth, during the incubation phosphorus increased20%, calcium increased more than200%、iron 80%、zinc14%, respectively.5. Parts of the embryonic age eggs were boiled by different time and then detect the changes of protein、 water-solution vitamins and taurine，the results showed that there were not obviously changes of the nutrition elements above in5minutes boiling, the retention of them can reach as high as80%or even more, but as the boiling times lasted, the loss would increase.To sum up.there are many kinds of nutrition elements in enbryonated eggs increased during incubation, especially after the14th day, so it is available to choose the late14th day enbryonated eggs to eat and it is best to avoid excessive processing before eat to prevent the nutrition loss.