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Merck Manual
Veterinary Manual
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Developing embryo, fertile egg, chicken
Developing embryo, fertile egg, chicken

A fertile egg candled with a developing chicken embryo. Notice visualization of blood vessels around the developing embryo.

Courtesy of Dr. Yuko Sato.

In these topics
Laying and Reproduction in Backyard Poultry

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Merck & Co., Inc., Kenilworth, NJ, USA is a global healthcare leader working to help the world be well. From developing new therapies that treat and prevent disease to helping people in need, we are committed to improving health and well-being around the world.  The Merck Veterinary Manual was first published in 1955 as a service to the community.  The legacy of this great resource continues as the Merck Veterinary Manual in the US and Canada and the MSD Manual outside of North America.

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