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

Consequences of kinetics of ruminal degradation on ruminal metabolism and zootechnical performances

INRA Prod. Anim., 8 (5), 353-367.


1INRA-INAPG Laboratoire de Nutrition et Alimentation, 16 rue Claude Bernard, 75231 Paris Cedex 05

2INRA Station de Recherches Porcines, 35590 Saint Gilles


Research of the last decades have demonstrated that the kinetics of ruminal degradation of feeds vary largely in function of their nature and of the constituent. It can therefore be envisaged to take the opportunity of this variability to formulate compound feeds or mixed diets which are more and less rapidly degraded or more and less synchronized between the carbohydrates and proteins degradation rates in comparison with the microbe requirements.

Experimental data related to the influence of the variations of these phenomena on ruminal digestion and zootechnical performances show that the effects are less important that could be a priori imagined. It is therefore necessary to explain that fact. It seems that numerous structures and phenomena of delay allow to smooth efficiently the dynamic variations of degradation processes between feeds or constituents. Several examples are evoked. For nitrogenous products smoothing phenomena particularly occur by a transient storage of peptides before microbial captation and nitrogenous recycling by protozoa and blood urea recycling. For energy nutrients, it seems that the most important transient storage of energy is in the form of polysaccharidic storage within the microbial cells. The dynamic approach of ruminal digestion also emphasizes that microbial growth rate is limited and less variable in short term, even if sufficient nutrients are available. Some comments and explanations are made on this aspect.

Download documents