Avian Embryology 2
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Avian Embryology 2
old stuff review
review of stuff on past midterms
What are the favorable incubating conditions for the chickens?
What are the characteristics of the broody hen?
-BMR rate drops
-Body temp drops 1-2 degrees
-Behavior pattern changes
Management of the broody hen
-Do not disturb
-Match egg size with hen
-Dark light/Subdued light
-Watch for mites
The egg is comprised of these main parts, what % is each component?
Egg production is orchestrated through these different organs:
What is the purpose of the hypothalamus?
What ovary is functional?
What makes up an ovary?
-2,000 small follicles (300 attain maturity)
What are the 3 periods in Avian Maturation?
-Sexual Maturation (18-20 weeks)
-Subsequent rapid growth
What changes in the ovary occur during sexual maturation?
-Cells in the largest follicle produce progesterone in response to LH
-As hens mature, plasma levels of estrogen increase
-Causes liver to synthesize lipids
Name the Oviduct Tract in order, starting from Ovary
How long is the oviduct in the laying hen?
Functions of the Infundibulum
-Site of Fertilization
-Hosts Yolk for 15-30 minutes
-Applies perivitelline membrane and chalaza
-Has specialized glands for sperm storage
-Secretion of thick albumen
-Takes 3-4 hours
-Inner/Outer shell membranes
-Prevents bacterial entry
Functions of Uterus/Shell Gland
-Water and Electrolytes
How long does the egg stay in the Vagina?
A few seconds
What way is an egg laid?
Large end first
What are the two poryphyrins that contribute to egg shell pigment?
What is Egg-Drop Syndrome?
-A viral disease that produces shell-less or soft-shelled eggs
Anatomy of the Spermatozoal cell
-Acrosome and Pronucleus
Where are sperm cells produced?
Where is semen produced?
-In the Vas Deferens
Primary Germ Layer Completion steps:
1. All embryonic layers originate from epiblast
2. At gastrulation, cells from epiblast migrate down between epiblast & hypoblast
3. Presumptive mesodermal cells remain between epiblast & hypoblast
4. Presumptive endoderm is formed by cells that migrated down into hypoblast