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Front candling picture
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Species
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Incubation Period
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View from Candling
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Chick
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1
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A round spot with dark shade but a little bright along the edge which is similar to fish eye can be observed.
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Duck
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1-1.5
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Goose
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1-2
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Species
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Incubation Period
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View from Candling
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Chick
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2
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Blood vessel area in the yolk sac can be seen, similar to cherry, commonly referred to as cherry ball.
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Duck
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2.5～3
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Goose
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3～3.5
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Species
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Incubation Period
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View from Candling
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Chick
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3
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The blood vessels in the yolk sac look like mosquito, commonly referred to as mosquito ball.
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Duck
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4
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Goose
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4.5～5
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Species
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Incubation Period
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View from Candling
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Chick
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4
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Then rotating the egg, the egg yolk is not likely to rotate together, just like sticking on the egg shell. The embryo and the yolk sac look like a small spider.
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Duck
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5
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Goose
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5.5～6
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Species
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Incubation Period
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View from Candling
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Chick
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4.5
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An obvious black eye spot, commonly called single eye.
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Duck
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5.5
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Goose
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6.5
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Species
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Incubation Period
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View from Candling
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Chick
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6
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The embryo looks like an phone receiver, one end being the head, the other end being the body. Amniotic fluid can be seen.
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Duck
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7
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Goose
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8
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Species
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Incubation Period
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View from Candling
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Chick
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7
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The white amniotic fluid becomes even more, but the embryo’s movement is not frequent. It looks like that the embryo sinks in the amniotic fluid. The egg is full of yolk sac and blood vessels.
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Duck
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8
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Goose
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9
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Species
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Incubation Period
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View from Candling
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Chick
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8
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The embryo are very obvious to be seen, surrounded by the amniotic fluid, usually called ”swimming embryo”.
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Duck
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9
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Goose
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10
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背 面 照 蛋 图
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Species
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Incubation Period
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View from Candling
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Chick
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8
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The egg yolk has expanded to the backside of the egg. When rotating the egg, the egg yolk on the both edge don't shake.
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Duck
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9
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Goose
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10
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Species
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Incubation Period
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View from Candling
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Chick
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9
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When rotate the egg, it can be observed that the egg yolk also rotate. Then, the allantois blood vessel expand beyond the yolk sac.
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Duck
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10～11
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Goose
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11～12
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Species
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Incubation Period
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View from Candling
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Chick
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10～10.5
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Allantois blood vessel continues to spread until they become connected at the small end of the egg, occupying the whole egg except the air cell.
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Duck
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12～13
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Goose
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14～15
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Species
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Incubation Period
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View from Candling
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Chick
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11
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The blood vessel becomes thicker and its color darker.
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Duck
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14
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Goose
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16
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Species
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Incubation Period
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View from Candling
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Chick
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12
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The blood vessel becomes thicker and its color darker.
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Duck
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15
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Goose
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17
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Species
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Incubation Period
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View from Candling
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Chick
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13
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It can be observed that the bright part on the small end of the egg gets smaller, as the embryo’s age increases.
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Duck
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16
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Goose
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18
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Species
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Incubation Period
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View from Candling
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Chick
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14～16
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The bright part on the small end of the egg gets smaller, while the shadow gets larger, as the embryo’s age increases, which is sign of embryo body growth.
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Duck
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17～19
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Goose
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19～21
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Species
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Incubation Period
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View from Candling
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Chick
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14～16
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The bright part on the small end of the egg gets smaller, while the shadow gets larger, as the embryo’s age increases, which is sign of embryo body growth.
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Duck
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17～19
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Goose
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19～21
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Species
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Incubation Period
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View from Candling
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Chick
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16～17
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When candle the small end against the light, the bright part couldn't be seen.
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Duck
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20～21
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Goose
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22～23
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Species
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Incubation Period
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View from Candling
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Chick
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16～17
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When candle the small end against the light, the bright part couldn't be seen.
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Duck
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20～21
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Goose
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22～23
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Species
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Incubation Period
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View from Candling
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Chick
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18
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The air cell slants, as the embryo turn itself.
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Duck
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22～23
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Goose
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24～26
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Species
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Incubation Period
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View from Candling
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Chick
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19
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Movement is seen from the shade.
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Duck
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24～25
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Goose
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27～28
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Species
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Incubation Period
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View from Candling
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Chick
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20
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The chick first pip out of the air shell and then peck out of the egg shell.
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Duck
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25～27
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Goose
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29～30
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Species
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Incubation Period
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View from Candling
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Chick
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20.5～21
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Hatch out.
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Duck
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27.5～28
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Goose
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30.5～31
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