Essential oils/Source

Dietary inclusion

Performance parameter

NE lesion score

References

Citrus, oregano and annase EOs

1 g/kg of feed

Reduction in mortality (26% PC* vs 8% EOs).

1.33 vs 0.58 (PC vs EOs).

[120]

Ginger oil and carvacrol

1.5 g/kg of feed

EOs improve BW in 100 g compared to the PC.

3.0 vs 2.3 (PC vs EOs).

[135]

Capsicum oleoresin and turmeric oleoresin

4 mg of each oleoresin per kg of feed.

Improve BW (P < 0.05).

2.8 vs 1.2 (PC vs EOs).

[136]

Thymol and carvacrol

0, 60, 120 or 240 mg/kg of feed

EO linearly reduce FCR (P = 0.056).

1.5 vs <0.5 (PC vs EOs).

[134]

Thymol and carvacrol

120 mg/kg of feed

Reduction in mortality (20% PC vs 4% EOs).

>2 vs <1 (PC vs EOs).

[137]

Thyme (thymol) and clove (eugenol)

Combination: Thyme 2.5 g/kg and Clove 1.25 g/kg of feed

EOs improve BWG in 200 g compared to PC.

FCR 2.84 PC vs 1.88 EOs.

3.0 vs 1.0 (PC vs Eos).

[117]

Peppermint oil

0.5 or 0.25 ml/ml of water

Reduction in mortality (55% PC vs 10% EOs). Improve BWG in 41 g

ND?o:p>

[138]

Thymol and carvacrol

120 mg/kg of feed

Reduction in mortality (20% PC vs 4% EOs).

>2 vs <1 (PC vs EOs).

[122]

Garlic nanohydrogel

100, 200, 300 or 400 mg/kg

EOs increase BWG 181 g, 367 g and 588 g (200, 300 and 400 mg/kg).

>2 vs <1 (PC vs 400 mg/kg EOs).

[139]

Thyme, savory, peppermint and black pepper

0.5, 1 or 2 g/kg of feed

Improvement in BW and FCR with 1 or 2 g/kg inclusion.

ND

[140]

Thymol and carvacrol

200 or 300 mg/kg of feed

Improve BWG during challenge period (P < 0.05).

ND

[141]

Eugenol and garlic tincture

100 mg/kg of feed

Overall FCR was improved 1.681 PC vs 1.645 EOs

0.5 vs <0.5 (PC vs EOs—only in males).

[129]