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: https://www.ghostery.com/fr/products/

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: http://www.youronlinechoices.com/fr/controler-ses-cookies/, 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

Realytics
Google Analytics
Spoteffects
Optimizely

Targeted advertising cookies

DoubleClick
Mediarithmics

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 cil-dpo@inra.fr or by post at:

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

Dernière mise à jour : Mai 2018

Menu Logo Principal

Home page

Effects of nutrition on ewes’ milk quality

INRA Prod. Anim., 14(2), 129-140.

F. BOCQUIER ¹, G. CAJA ²

1 UFR Productions Animales, UZM, ENSA.M-INRA, 2 place Viala, 34060 Montpellier Cedex 1

2 Unidad de Producción Animal, Departamento de Patología y Producciones Animales, Universidad Autónoma de Barcelona, 08193 Bellaterra, Espagne

Abstract 

Control of milk composition is of importance in dairy ewes because milk is mainly used for cheese making. Besides numerous factors that alter milk composition, knowledge on the effects of nutrition is useful for it concerns both yield and milk content. Level of nutrition is a main factor affecting milk yield and milk composition in dairy ruminants : i.e. milk yield increases with level of nutrition and vice versa, but effects on milk composition are less clear. Milk fat content is in general negatively correlated to energy balance, whereas with protein content the correlation is positive. In consequence, in most cases, a high level of nutrition in dairy sheep will depress fat content and slightly increase milk protein content. In addition, an increase in dietary protein supply will increase milk protein yield, if the ewe has not reached its potential yield, but this response is not associated to changes in milk protein content. An easy mean of increasing energy supply is to use high quantities of concentrate, but this may directly depress milk fat and protein content and secondarily turn energy partition from milk to body fat depots. The use of specific nutrients such as protected fat or amino acids appears to be of interest as a mean of improving milk fat and/or protein content in dairy ewes. Limited experience is, however available, nowadays and advantages or drawbacks are not fully known.

In the practical conditions of dairy flock management the effects of nutrition are often hidden in the complexity of numerous factors that are also known to alter milk composition. Therefore, as within-group individual nutritional status is unknown, global response in term of bulk milk composition is difficult to predict. This leads to the notion of group-feeding strategies that include the variety of animal responses to feeding treatments.

Download documents