Merck Manual

Please confirm that you are a health care professional

honeypot link

False Layer (in Poultry)

By

Rodrigo A. Espinosa

, DVM, MAM, DACPV, Aviagen, Inc

Last full review/revision Aug 2019 | Content last modified Sep 2019
Topic Resources

False layer hens look and ovulate normally but do not produce eggs. Typically, hens appear healthy, with fully developed secondary sexual characters and an active ovary, but a nonfunctioning oviduct. They are found at the peak of egg production. The yolk is dropped into the abdominal cavity rather than being collected by the oviduct, and once in the abdominal cavity the yolk is absorbed.

Oviduct dysfunction can occur after infections with Escherichia coli or Mycoplasma gallisepticum, resulting in inflammation and obstruction of the oviduct and also from early infection (at 1–2 weeks of age) with an infectious bronchitis virus Infectious Bronchitis read more (IBV) variant that can cause hypoplasia of the ovary and oviduct. Originally reported in Asia in 1996-1998, where the virus was designated as QX, and in Europe in 2004, classified as D388 (genetically similar to QX), the virus has spread through a vast territory and has also been found in North and Latin America.

Others also read
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID

Test your knowledge

Avian Influenza
Influenza A viruses are divided into 16 hemagglutinin (H1-16) and 9 neuraminidase (N1-9) subtypes. Which of the following subtypes is most likely to cause a highly pathogenic form of avian influenza in poultry? 
Become a Pro at using our website 

Also of Interest

Become a Pro at using our website 
TOP