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Enzymatically treated yeast to affect gut integrity and growth performances of Eimeria challenged broiler

Published: April 26, 2022
By: Hagen Schulze 1, Douglas Haese 2 / 1 Livalta / AB Agri; 2 Centro de Tecnologia Animal.
Summary

Eimeria is known to cause coccidiosis, an endemic disease, that has been estimated to induce losses of US$ 0.17/ slaughtered chicken in North America. The aim of this study was to evaluate an enzymatically treated yeast (LivaltaCell HY40, Livalta, UK; HY40) on gut integrity and growth performance of Eimeria sp. challenged broiler chickens. Eighty-four groups of 30 male broiler chicks (Cobb 500) were allocated to one of 7 dietary treatments, containing either 0, 0.05, 0.2, 0.8 or 3.2% HY40 (treats C, D, E, F, G), formulated in corn and soybean meal- based diets in four phases: 1 (d 0-7), 2 (d 8-21), 3 (d 22-33) and 4 (d 34-42). Treats A and B contained coccidiostats in phases 1, 2 and 3. On d 14, birds in treats B to G were challenged with a blend of Eimeria tenella (2,000 oocyst/bird), E. acervulina (25,000 oocyst/bird) and E. maxima (10,000 oocyst/bird) by oral gavage, whilst birds of treat A received a saline solution. Growth performance parameters (body weight, BW; feed intake; feed conversion ratio, FCR) were recorded on d 7, 21, 33 and 42. Jejunal and caecal digesta oocysts counts (OC) were measured on d 21 and 42. Birds were scored for lesions (LS) at duodenum for E. acervuline, jejunum for E. maxima and ceca for E. tenella at d 21. Lowest OCs were found throughout for treat A and no treat effects on d 42. On d 21, treat B effectively reduced (P<0.05) jejunal OC compared with treat C. In birds of treat E, F and G caecal OCs were reduced (P<0.05) compared with treat D. Birds of treats A and B had minimal gut lesions (LS 0 and 7) whereas treats C and D had highest LS (33 and 33). Starting from 0.2% HY40, treat E, F and G, LS was strongly reduced with 12, 13 and 11, respectively, compared with treat C and D. There was no differences (P>0.05) on growth performance between birds of treats A and B. Overall, birds of treat C had significantly reduced BW (-226g) and FCR (+7 points) compared with treat A. Whilst starting from 0.2% inclusion, treat E, F and G, HY40 significantly improved d 42 BW by 4% (+101g) and FCR by -6 points, reaching comparable FCR to birds treated with coccidiostat (treat A and B). In conclusion, HY40 can be an effective ingredient in poultry antibiotic-/ coccidiostat-free feeding systems to support welfare and performance of the birds.

Key Words: Enzymatically treated yeast, Performance, Eimeria challenge, Oocyst count, Broiler.

      

Presented at the International Poultry Scientific Forum at IPPE 2022 in Atlanta, USA.

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Authors:
Hagen Schulze
Livalta
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Douglas Haese
Centro de Tecnologia Animal Ltda
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