Hello, actually yes, they are giving very good results. Personally, I work with phytobiotics, and I am doing very well. There is a lot to investigate, there are alternatives...
Greetings from Ecuador.
Agreed with @Teresa M. Agulles Teixidò,
Some essential oils (EOs) from Eucalyptus spp., peppermint, balsam fir needle oil have naturally respiratory tropism properties as expectorant, mucus fluidisation, stimulating of the ciliary beat frequency (CBF) of nasal mucosa.
I was formulating a lot of EOs based feed additive since 2003, and I can confirm these alternative and natural solutions may help animals producers and veterinarian practitioners to decrease the use of antibiotics in first intention defence/strategy.
Moreover, the EOs based solutions may be added on current preventative respiratory strategies by mixing both drugs and these EOs with complementary as well as synergestic effects from this integrative strategy.
At your disposal for more precise data.
Bertrand MEDINA - PROBIOTECH International Inc.