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With regard to the concentrations of ammonia in the stable, bedding with wheat straw had advantages over both straw pellets and wood shavings.

Because of the results found in Exp. 1, it appears sensible to carry out work when there are no horses in the stables because activities in the stable (feeding, mucking out, and sweeping) cause both increased amounts of ammonia and increased airborne particle concentrations (see Fleming et al., 2008b).

With regard to the management of bedding, it could be concluded from Exp. 2 that bedding for 2 wk on wheat straw with no mucking out had no negative influence on ammonia concentrations in the stable.

Advantages were indeed offered by this regimen compared with mucking out daily.

Even when wheat straw bedding was used over a longer time (6 wk), the ammonia values did not increase constantly with time.

Based on these results, it would be sensible to dispense with daily mucking out, although additional bedding should be added regularly.

The choice of mucking regimen, however, was not just dependent on the ammonia and particle concentrations; other factors have to be taken into account.

For example, the growth of pathogenic germs and fungi would certainly be favored if the same bedding were maintained for some weeks, which, in turn, would have a negative effect on animal health.

Furthermore, there would be a greater risk of a reinfection of the horse by its own excrement (ie, endoparasites) as well as a potentially greater development of insects within the stable. LITERATURE CITED Banhazi, T., R.

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