Poultry 3 Flashcards
Site of fertilization
Infundibulum
Function of infundibulum?
Fertilization
Sperm Storage
In regards to percent hatchability, what does Of total Eggs Set refer to?
Does not indicate the reason for low hatchability
When do you expect to see high mortality in pattern of embryonic mortality ?
4 Days - Tissue differentiation requires a lot of energy
27 days - hatching, dehydration and or bacteria
Why do meat birds have lower expected hatchability than egg birds?
Genetic selection
Using a candle - egg classifications
Clear = Infertile or early embryonic mortality
Blood Ring = Dead embryo
Heart = Live embryo
How do you differentiate infertility from early embryonic mortality
- Take these clear embryo eggs out and determine if they are infertile or not
At what time do you candle eggs to check mortality ?
5 to 10 days of incubation
Causes of low hatchability?
- Fertility
- Embryonic mortality
- Incubation problems
Issues causing low fertility
- Nutrition - broiler breeders when they get fat drop two follicles
- Male to female ratio - too many males and they fight, too few and note enough breeding
- Disease
- External parasites
5 Artificial insemination problem
Reasons for embryonic mortality
- Egg handeling and storage
- Improper setter and hatcher settings
- Disease
- Breeder age
- Nutrition
- Genetic factors
What is the amnion?
Clear fluid surrounding embryo = protects embryo
What is the yolk sac
Membrane enveloping the yolk
Nutrient uptake
Primary source of energy during last 1/3 of incubation
Drawn into body cavity prior to hatch
Early nutrient supply for newly hatched bird
What is the allantoic membrane
Completely envelopes the embryo and is highly vascular
Function of allantoic membrane?
Respiration
Excretory - removes uric acid crystals
Digestive
