Brands

Direct Bolus

Direct boluses aim to work immediately after insertion. Direct-acting boluses are available in 'pressed' and 'filled' form. The filled form is presented in a gelatine capsule.

Pressed boluses and gelatine boluses are actually powders produced that way for a variety of reasons. Pressed boluses and gelatine boluses are used to make powders easier to infuse and to cover up unpleasant tastes, allowing unpalatable ingredients to be infused as well.


Compressed bolus A compressed bolus must always be firmly pressed, otherwise it would crumble in the packaging. In addition, compressed boluses are also compressed extra hard so that they do not disintegrate in the bolus chute or in the oesophagus. This often requires the use of additional additives. Compressed boluses will, in most cases, disintegrate over a period of time (several hours) after insertion and are then gradually absorbed. The disintegration is very different for each bolus and also depends on its exact composition.		Direct bolus This is a gelatine bolus. The bolus contains components that are immediately released once the capsule 'falls' into the rumen and contains no additives. A gelatine bolus is absorbed within minutes. This is because the capsule quickly dissolves in the rumen with moisture and heat, immediately releasing the contents of the bolus.

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Compressed bolus

Less easy to swallow

Often retains its shape for a long time before disintegrating

Contains filler "ballast" to press the bolus down

Takes a long time to release its contents

Direct bolus

Easy absorption

No aftertaste

Glides easily down the oesophagus

Quickly dissolves in the rumen

Contains no fillers

Content is available "directly"