Know more

Our use of cookies

Cookies are a set of data stored on a user’s device when the user browses a web site. The data is in a file containing an ID number, the name of the server which deposited it and, in some cases, an expiry date. We use cookies to record information about your visit, language of preference, and other parameters on the site in order to optimise your next visit and make the site even more useful to you.

To improve your experience, we use cookies to store certain browsing information and provide secure navigation, and to collect statistics with a view to improve the site’s features. For a complete list of the cookies we use, download “Ghostery”, a free plug-in for browsers which can detect, and, in some cases, block cookies.

Ghostery is available here for free:

You can also visit the CNIL web site for instructions on how to configure your browser to manage cookie storage on your device.

In the case of third-party advertising cookies, you can also visit the following site:, offered by digital advertising professionals within the European Digital Advertising Alliance (EDAA). From the site, you can deny or accept the cookies used by advertising professionals who are members.

It is also possible to block certain third-party cookies directly via publishers:

Cookie type

Means of blocking

Analytical and performance cookies

Google Analytics

Targeted advertising cookies


The following types of cookies may be used on our websites:

Mandatory cookies

Functional cookies

Social media and advertising cookies

These cookies are needed to ensure the proper functioning of the site and cannot be disabled. They help ensure a secure connection and the basic availability of our website.

These cookies allow us to analyse site use in order to measure and optimise performance. They allow us to store your sign-in information and display the different components of our website in a more coherent way.

These cookies are used by advertising agencies such as Google and by social media sites such as LinkedIn and Facebook. Among other things, they allow pages to be shared on social media, the posting of comments, and the publication (on our site or elsewhere) of ads that reflect your centres of interest.

Our EZPublish content management system (CMS) uses CAS and PHP session cookies and the New Relic cookie for monitoring purposes (IP, response times).

These cookies are deleted at the end of the browsing session (when you log off or close your browser window)

Our EZPublish content management system (CMS) uses the XiTi cookie to measure traffic. Our service provider is AT Internet. This company stores data (IPs, date and time of access, length of the visit and pages viewed) for six months.

Our EZPublish content management system (CMS) does not use this type of cookie.

For more information about the cookies we use, contact INRA’s Data Protection Officer by email at or by post at:

24, chemin de Borde Rouge –Auzeville – CS52627
31326 Castanet Tolosan CEDEX - France

Dernière mise à jour : Mai 2018

Menu Logo Principal

Home page

Protein turnover in growing chicken. Influence of dietary protein

INRA Prod. Anim., 8 (3), 197-212.


INRA Station de Recherches Avicoles, 37380 Nouzilly


A possible dietary option that would ensure maximal muscle growth while avoiding excessive nitrogen loss to the environment consists of lowering the quantity of protein in the feed and using synthetic amino acids to supplement the diet. This review was undertaken in order to improve understanding of the effects of changes in the amount of protein in the diet (variations in the total quantity of protein and in its amino acid composition) on protein synthesis and breakdown. The balance between the two latter processes regulates protein deposition.

The current methods for measuring protein synthesis have been presented here, noting the assumptions and limitations for each one. The techniques for estimating protein breakdown have also been briefly described. The turnover of whole-body and tissue proteins varies according to individual animal characteristics. For example, the fractional rate of protein synthesis decreases with age, especially for the skeletal muscles and the fractional rate of protein breakdown varies with the genotype.

The quantity of protein in the feed modifies the protein metabolism of the animal. These effects are due to the quantity of ingested protein as well as to fluctuations in the input level (protein starvation followed by protein re-feeding). The amino acid composition of the dietary protein also plays an important role. Thus a decrease in the protein intake or a deficiency in a particular amino acid may reduce the quantity of protein synthesized and, to a lesser extent, degraded. The mechanisms that regulate protein deposition in response to alterations in protein and amino acid supply, however, remain poorly understood. Further investigations of protein metabolism in different tissues and organs, including physiological and hormonal factors, need to be undertaken in order to deepen understanding of the effects of amino acid supplementation and provide a better basis for diet formulation.

Download documents