Research note: immunity to Eimeria in broilers reared on nicarbazin and salinomycin.
The incidence of oocysts was monitored in the litter at two broiler farms where birds were reared to 8 wk of age using a shuttle program involving nicarbazin (from 0 to 21 days of age) and salinomycin (from 21 to 44 days of age). Some birds from these farms were challenged with three species of Eimeria to see whether immunity had developed as a result of prior exposure to infection. Oocysts of at least three species of Eimeria were present in small numbers in the litter. Birds from both farms were immune to Eimeria acervulina and Eimeria maxima (judged by weight gain) although the immunity was incomplete as evidenced by oocyst production. Birds from one farm were immune to Eimeria tenella (judged by weight gain) but birds from the other farm were susceptible to this species.
Chapman
H D
HD
Department of Animal and Poultry Sciences, University of Arkansas, Fayetteville 72701.
D000818:Animals; D002645:Chickens; D003048:Coccidiosis / Q000276:immunology / Q000517:prevention & control / Q000662:veterinary*; D003049:Coccidiostats / Q000627:therapeutic use*; D004539:Eimeria / Q000254:growth & development / Q000276:immunology* / Q000302:isolation & purification; D016786:Eimeria tenella / Q000254:growth & development / Q000276:immunology / Q000302:isolation & purification; D009528:Nicarbazin / Q000627:therapeutic use; D011201:Poultry Diseases / Q000276:immunology* / Q000517:prevention & control; D011714:Pyrans / Q000627:therapeutic use; D015430:Weight Gain; D000095662:Polyether Polyketides
D003049:Coccidiostats; D009528:Nicarbazin; D011714:Pyrans; C010327:salinomycin; D000095662:Polyether Polyketides