Abstract
The objective of this study was evaluated the villus integrity of commercial turkeys submitted to coccidiosis prevention methods and challenged with Eimeria field oocysts, using scanning electron microscopy. Sixty BUT 9 female commercial turkeys were distributed in a completely randomized block design split with two treatments: T1- control diet without vaccinations against coccidiosis and anticoccidial drug, and T2- vaccinated against coccidiosis (commercial vaccine). On d 21 of life, all birds of all treatments were challenged with a mixed-species containing E. meleagrimitis and E. galopavonis, via crop intubation with 1 mL of ~20,000 sporulated oocysts/bird. The size of the inoculum was determined in previous experiments. At 27 and 70 days of age, five birds per treatment were randomly removed to evaluate the intestinal integrity. Duodenum, jejunum and ileum segments were collected and processed according to routine scanning electron microscope. The enteric mucosa integrity of the commercial turkeys subjected to coccidiosis vaccination was reduced when compared to the birds of the control treatment. There was no difference in the performance results, therefore these results cannot be attributed to the vaccination as well as to the ineffectiveness against the challenge that was administered.
Highlights
The most relevant enteric diseases of infectious origin in turkeys are hemorrhagic enteritis, necrotic enteritis, histomoniasis, poult enteritis and mortality syndrome (PEMS), salmonellosis, and coccidiosis (Hafez, 2004; Hafez, 2013).Coccidiosis or eimeriosisis caused by protozoan parasites of the genus Eimeria, and it is considered one of the most important diseases in the poultry industry
The objective of this study was evaluated the villus integrity of commercial turkeys submitted to coccidiosis prevention methods and challenged with Eimeria field oocysts, using scanning electron microscopy
In Treatment 1, birds were not vaccinated against coccidiosis, and in Treatment 2, birds received a vaccine against coccidiosis
Summary
The most relevant enteric diseases of infectious origin in turkeys are hemorrhagic enteritis, necrotic enteritis, histomoniasis, poult enteritis and mortality syndrome (PEMS), salmonellosis, and coccidiosis (Hafez, 2004; Hafez, 2013).Coccidiosis or eimeriosisis caused by protozoan parasites of the genus Eimeria, and it is considered one of the most important diseases in the poultry industry. Low infection levels of coccidia may reduce the birds’metabolic and immune efficiency, causing significant economic losses in the turkey industry (Lillehoj & Lillehoj, 2000). When disinfection and cleaning alone are not sufficient to control the disease, anticoccidials need to be added to the feed or birds need to be vaccinated, because Eimerias poocysts remain viable for more than a year in the environment (Allen & Fetterer, 2002). The economic impact, the production benefits, and the limitations of vaccination and control strategies of coccidiosis is improving over time (Allen & Fetterer, 2002)
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