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Poultry Knowledgebase

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Yersiniosis This infection is carried by wild birds, but only affects poultry in cases of poor environmental conditions and high infectious challenge.
Yolk The yolk or yellow portion makes up about 33% of the liquid weight of the egg. It contains all of the fat in the egg and a little less than half of the protein.
Yolk Sac One of four extra-embryonic (outside the embryo) membranes inside an egg.
The four membranes are: allantois, chorion, the amnion and the yolk sac.
Yolk sac The follicle where an ovum and its surrounding yolk are held until the yolk matures and is released.

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