Abstract
This survey was carried out to determine the seroprevalence of Mycoplasma gallisepticum (MG) and Mycoplasma synoviae (MS) infections in commercial layer farms in Centernorth of Iran. A total of 2000 serum samples were collected from 40 commercial layer flocks (50 samples/ flock) mostly > 40-week-old. Sera tested by serum plate agglutination (SPA) method using commercial MG antigen and MS antigen. Positive reactions retested by SPA on 1:8 dilution and the flocks with more than 10% positive reactions considered positive serologically. The results showed that 4 of 40 (10%) flocks were MG positive and the rest (90%) were negative. About MS, 17 of 40 (42.5%) flocks were positive and 33 of 40 (57.5%) were negative. Sera tested for MG were: 125 of 2000 (6.25%) positive, 1821 of 2000 (91.05%) negative and 54 of 2000 (2.7%) suspect. Sera for MS were: 371 of 2000 (18.55%) positive, 1617 of 2000 (80.85%) negative and 12 of 2000 (0.6%) suspect. Statistical analysis showed a positive correlation between MS positive flocks and strain (LSL flocks compared to Hy-Line flocks) and capacity of the farms significantly (P<0.05). It seems that the seroprevalence of MS in the commercial layer flocks of the Centernorth of Iran is high. Key words: Mycoplasma gallisepticum, Mycoplasma synoviae, seroprevalence, serum plate agglutination test.
Highlights
Avian Mycoplasmosis caused mainly by Mycoplasma gallisepticum (MG) and Mycoplasma synoviae (MS), can cause considerable economic losses in chicken such as chronic respiratory disease, reduce weight gain and meat quality and increase FCR and mortality in broiler, tremendous drop in egg production in layers and increase embryo mortality in breeders (Stipkovits and Kempf, 1996; Kleven and Noel, 2008; Ley, 2008)
The results showed that 4 of 40 (10%) flocks were MG positive and the rest (90%) were negative
Sera tested for MG were: 125 of 2000 (6.25%) positive, 1821 of 2000 (91.05%) negative and 54 of 2000 (2.7%) suspect
Summary
Avian Mycoplasmosis caused mainly by Mycoplasma gallisepticum (MG) and Mycoplasma synoviae (MS), can cause considerable economic losses in chicken such as chronic respiratory disease, reduce weight gain and meat quality and increase FCR and mortality in broiler, tremendous drop in egg production in layers and increase embryo mortality in breeders (Stipkovits and Kempf, 1996; Kleven and Noel, 2008; Ley, 2008). The disease may be transmitted horizontally and vertically and remains in the flock constantly as subclinical form (Bradbury and Jordan, 2003). It has been shown that an association between infection of the oviduct with MS and the eggshell apex abnormalities (EAA) characterized by a Haghighi-Khoshkhoo et al 2835. Infection in the chickens of selected model commercial layer farms of the Centernorth of Iran and detect the correlation between positive farms and breeding variables
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