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  • Most purposes explained in this notice rely on the storage or accessing of information from your device when you use an app or visit a website. For example, a vendor or publisher might need to store a cookie on your device during your first visit on a website, to be able to recognise your device during your next visits (by accessing this cookie each time).

Advertising presented to you on this service can be based on limited data, such as the website or app you are using, your non-precise location, your device type or which content you are (or have been) interacting with (for example, to limit the number of times an ad is presented to you).

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Information about your activity on this service (such as forms you submit, content you look at) can be stored and combined with other information about you (for example, information from your previous activity on this service and other websites or apps) or similar users. This is then used to build or improve a profile about you (that might include possible interests and personal aspects). Your profile can be used (also later) to present advertising that appears more relevant based on your possible interests by this and other entities.

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Advertising presented to you on this service can be based on your advertising profiles, which can reflect your activity on this service or other websites or apps (like the forms you submit, content you look at), possible interests and personal aspects.

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Information about your activity on this service (for instance, forms you submit, non-advertising content you look at) can be stored and combined with other information about you (such as your previous activity on this service or other websites or apps) or similar users. This is then used to build or improve a profile about you (which might for example include possible interests and personal aspects). Your profile can be used (also later) to present content that appears more relevant based on your possible interests, such as by adapting the order in which content is shown to you, so that it is even easier for you to find content that matches your interests.

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Content presented to you on this service can be based on your content personalisation profiles, which can reflect your activity on this or other services (for instance, the forms you submit, content you look at), possible interests and personal aspects. This can for example be used to adapt the order in which content is shown to you, so that it is even easier for you to find (non-advertising) content that matches your interests.

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Your device might be distinguished from other devices based on information it automatically sends when accessing the Internet (for instance, the IP address of your Internet connection or the type of browser you are using) in support of the purposes exposed in this notice.

With your acceptance, your precise location (within a radius of less than 500 metres) may be used in support of the purposes explained in this notice.

With your acceptance, certain characteristics specific to your device might be requested and used to distinguish it from other devices (such as the installed fonts or plugins, the resolution of your screen) in support of the purposes explained in this notice.

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Varkensbedrijf.nl

Vertering van vezelrijke reststromen in de maag 

Onderzoek

Vertering van vezelrijke reststromen in de maag 

Om de veeteelt duurzamer te maken, zoeken wetenschappers naar reststromen die ingezet kunnen worden als varkensvoeder. Die reststromen zijn echter vaak rijk aan moeilijk verteerbare vezels. Onderzoekers van Wageningen University & Research zochten nu uit hoe de fysieke en chemische eigenschappen van vezels de vertering in de maag beïnvloeden. Ze experimenteerden daarvoor met pectine en met grovere en fijnere gemixte ingrediënten. 

In een praktijkproef werden 24 beren in vier groepen verdeeld. De dieren kregen één van vier mogelijke voeders. De eerste twee voeders bevatten 150 gram stro per kilogram voeder. Het stro was ofwel fijn (0,3 mm2), ofwel grof (5,4 mm2) gemalen. In de andere twee voeders vormden tarwezemelen het hoofdbestanddeel (270 gram per kilogram voeder). Hieraan werd bij één voeder nog 100 gram per kilogram pectine toegevoegd. Pectine is een plantaardig bindmiddel. Het zorgt ervoor dat de maaginhoud een gelachtige consistentie krijgt. 

Eén uur na het laatste voedermoment werden de beren geëuthanaseerd. Vervolgens verwijderden de onderzoekers de maag om de inhoud ervan te kunnen analyseren. Er werd nagegaan hoe lang het voedsel in de maag aanwezig bleef en in welk deel van de maag het zich bevond. Verder werd ook de pH-waarde van de maaginhoud getest. 

De pH-waarde verlaagde bij alle voeders in het onderste deel van de maag. De maaginhoud werd dus zuurder naarmate het voedsel zich verder in het verteringsproces bevond. Daarnaast toonde het onderzoek aan dat de maaginhoud gradueel geledigd wordt. Eerst verdwijnen vloeistoffen uit de maag, daarna de fijnere en ten slotte de grovere deeltjes. Dit was het geval bij alle vier de voeders. 

Toch waren er ook verschillen tussen de groepen. Fijner gemixt stro bleef minder lang in de maag aanwezig en bracht ook een zuurdere maaginhoud met zich mee. De toevoeging van pectine had eveneens een snellere lediging van de maag als gevolg. De fysieke en chemische eigenschappen van vezels in het voeder kunnen het verteringsproces in de maag dus beïnvloeden. 

Samenstelling: Maarten Ceyssens

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