2b – Hatchery Management Flashcards
1
Q
Where is the site of fertilization?
A
- Infundibulum
2
Q
What is oviposition?
A
- Expulsion of egg from oviduct to external environment
- *expulse eggs in morning, mate in afternoon before egg shell is formed and then the egg develops through the night
3
Q
How many cells are in the ovary of a day old chick?
A
- 30,000 to 60,000 ova (cells)=high potential to lay eggs!
- *left ovary regresses
- Right ovary=functional
4
Q
What are the two ways to determine fertility? (before incubation)
A
- Macroscopic
- Microscopic
- *use light from bottom=lighter ones=not fertile
5
Q
Macroscopic examination of fertility before incubation
A
- Open egg and look at white germinal disc
- “if blends in=fading away=not fertile”
o Proteins are degrading
6
Q
How is fertility determined at the hatchery?
A
- Incubation test
o Fails to differentiate between early embryonic death from infertility
o Usually how it is done! - Microscopic test during early incubation (research)
7
Q
2 ways to determine percent hatchability
A
- % hatchability of TOTAL egg set
- % hatchability of fertile eggs
8
Q
% hatchability of TOTAL egg set
A
- Does NOT indicate the reason for low hatchability
- *usual term used in industry