Prevalence of Antibodies Against Ornithobacterium rhinotracheale in Broilers and Breeders in Southern Brazil

Abstract

In this investigation, we determined the prevalence of the Ornithobacerium rhinotracheale (ORT) infection in broilers and broiler breeders in southern Brazil. We also correlated the presence of antibodies in broilers with performance. Sera from 1550 broilers from 50 flocks were collected during the slaughter time in nine companies with federal veterinary inspection of the state of Rio Grande do Sul. Sera from 480 meat-type breeders of 40 flocks from 14 companies in southern Brazil were also analyzed by enzyme-linked immunosorbent assay, and the prevalence of antibodies was determined. The prevalence of ORT antibodies in broiler flocks was 63.83%, but in each individual flock only 6.52% of the birds were positive. The prevalence in broiler breeder flocks was 100.00%, and in each individual flock 94.62% of the birds were positive. There was a positive correlation between the presence of antibodies to ORT and decreased body weight in broilers. There was no significant correlation between presence of antibodies to ORT and age, lineage, efficiency index, feed conversion, and mortality. There was a positive correlation between the presence of respiratory signs and antibodies to ORT, although the reverse correlation was not significant. These results confirm that ORT is present and widespread in broilers and broiler breeders in southern Brazil.

Seroprevalence and Identification of Ornithobacterium rhinotracheale from Broiler and Broiler Breeder Flocks in Thailand

“…Herein, the ELISA test revealed that broiler breeder flocks had a greater serologic prevalence for ORT than did broilers. All broiler breeder flocks tested were positive for the ORT antibody, and this was similar to the 100% positive flocks found in southern Brazil (8) and higher than the 79% found in broiler breeder flocks in Germany (15). In broiler flocks, 68% (13/19) had been found positive, and this was higher than the 60% positive flock found in southern Brazil (8) and the 26% found in broiler flocks in Germany (20).…”

Sero-prevalence and identification of Ornithobacterium rhinotracheale in broiler flocks in south-eastern Iran

“…Canal et al (2003) found that there is a positive correlation between the presence of respiratory signs and antibodies to ORT, although the reverse correlation was not significant. In this study, 31.90 % of serum samples were positive for ORT antibodies by ELISA.…”

Efficacy of four enrofloxacin treatment regimens against experimental infection in turkey poults with avian pneumovirus andOrnithobacterium rhinotracheale

“…APV, causing disease in most turkey-producing and chicken-producing countries worldwide (Cook, 2000;Van de Zande, 2001;Jirjis et al, 2002), also predisposes O. rhinotracheale to cause a secondary bacterial infection, thus aggravating the symptoms in the respiratory tract (van Empel et al, 1996;Jirjis et al, 2004;Marien et al, 2005Marien et al, , 2006. This double infection frequently occurs in the field where O. rhinotracheale is frequently isolated after APV infections (De Rosa et al, 1996;El-Sukhon et al, 2002) and is believed to play an important role in the respiratory problems in the turkey and chicken industry all over the world (Canal et al, 2003;Van Loock et al, 2005;Allymehr, 2006;Chansiripornchai et al, 2007).…”