Coccidiosis involvement A major predisposing factor for necrotic enteritis is coccid- iosis. It is caused by Apicomplexan parasites of the genus Eimeria which invade the intestinal tract and cause high morbidity, ranging from acute, bloody enteritis with high mortality, to sub-clinical disease. Coccidiosis often precedes or occurs concurrently with field outbreaks of NE. To evalu- ate potential interest in these plant extracts, a trial was set up in the United Kingdom comparing a blend of eugenol and garlic compounds (EG) to coccidiostats under environ- mentally induced sub-clinical necrotic enteritis. The study was performed on 960 Ross308 broilers raised to 35 days of age. Litter was re-used from a previous poultry flock to induce coccidiosis and sub-clinical NE. Three treatments were tested: Control (basal diet), a blend of eugenol and garlic compounds (EG; 100 g/t), and coccidiostats (narasin and nicarbazin; 60 g/t). The results showed a significantly higher bodyweight for the EG and coccidiostats groups compared to the control birds. Broilers supplemented EG reached the same feed conversion ratio as the coccidiostat treatment, outperforming the control group (-6.5%) (Figure 3).
Effective production support These results suggest that eugenol and garlic compounds may promote optimal performance in broilers under coccidia and NE challenge conditions. These phytomolecules may help to maintain the performance of challenged birds, thereby effec- tively reducing production costs and increasing the profitabili- ty of broiler production in the face of enteric disease risks.
References available on request.
Clostridium perfringens bacteria, anaerobic spore-produc- ing bacteria, the causative agent of necrotic enteritis.
Figure 2 – FCR (g/g) at 42 days 2,10
a
2,00 1,90 1,80 1,70 1,60
b c d
NEG C
Inf C
EG
BMD
Figure 3 – FCR (g/g) at 42 days 1,60
1,55 1,50 1,45 1,40 1,35
a
b
b
Control
EG ▶ POULTRY WORLD | No. 5, 2022
Coccidiostats 13
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