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Appetite genes are key to better diets for poultry, study shows
Date:3/26/2013

The welfare of poultry could be improved by a discovery about how chickens regulate their appetites.

Scientists have identified how a chicken's genetic make-up can affect the signals sent from its stomach to its brain that tell a chicken when it has had enough to eat.

Poultry farmers often have to restrict food for chickens because some birds are insensitive to feelings of fullness and can overeat, affecting their ability to reproduce.

The study could make it easier to develop methods to develop diets that reduce excess growth more naturally in these birds.

Researchers say that genetic differences, which affect when chickens recognise when they have had enough to eat, could date back thousands of years when chickens were first domesticated and breeds were selected for their size.

The research was carried out by The Roslin Institute at the University of Edinburgh.

Dr Ian Dunn, who led the study, said: "The findings shed greater light on food intake in birds and help us understand why some breeds in general the faster growing types of chickens are more insensitive to feelings of fullness than others."

The study, published in the American Journal of Physiology, Endocrinology and Metabolism, focused on a protein called cholecystokinin (CCK) that has a key role in sending signals linked to being full from the gut to the brain.

The researchers, funded by the Biotechnology and Biological Sciences Research Council, found that some birds were better equipped than others at recognising the protein, making them more effective in triggering signals of feeling full.

The study involved cross-breeding a fast-growing meat production strain of chicken with a relatively slow-growing, chicken. The researchers looked at how the protein was processed in both types of chickens and in the new cross breed.

They showed that reduced levels of protein that recognizes the fullness signal a
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Contact: Tara Womersley
tara.womersley@ed.ac.uk
01-316-509-836
University of Edinburgh
Source:Eurekalert

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