Analysis of the hatching results

(1)

Analysis of the hatching results

(2)

Breakout analysis

A fertile egg

• Blastoderm (embryo) always round

• Doughnut shape

• White symmetrical ring with clear centre

• Sometimes white dot present in centre

• Larger than blastodisc

(3)

An infertile egg

• Blastodisc rarely perfectly round

• Jagged edges

• Usually more vacuoles (bubbles)

• Small intense white spot, sometimes granulated

(4)

Candling to determine the fertility

(5)

Hatchability problem analysis

1. Eggs candle clear; broken out eggs show small white-dot germinal discs; no blood. Infertile

Possible causes ?????

(6)

2. Eggs candle clear; broken out eggs show enlarged germinal disc;

no blood. Fertile. Very early dead.

• Possible causes ?????

(7)

3. Eggs candle clear; broken out eggs show blood ring or small embryo that died before 3 days of incubation; no dark eye visible.

• Possible causes ?????

(8)

4. Dead embryos; 3 to 6 days of incubation; yolk sac

circulatory system present, embryo on left side, no egg tooth.

(9)

5. Dead embryos; 7 to 17 days of incubation; each embryo

has egg tooth, toenails, feather follicles (8 days), feathers (11 days).

(10)

6. Dead embryos >18 days of incubation.

(11)

7. Pipped. Full-term embryo, dead in shell.

(12)

8. Chicks hatch late.

(13)

9. Slow, protracted (drawn-out) hatch

(14)

10. Not uniform in hatch or chick quality.

(15)

11. Malposition

(16)

12. Malformation.

(17)

13. Contamination