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  • Title: Serologic survey of prevalence of ovine progressive pneumonia in Idaho range sheep.
    Author: Gates NL, Winward LD, Gorham JR, Shen DT.
    Journal: J Am Vet Med Assoc; 1978 Dec 15; 173(12):1575-7. PubMed ID: 218917.
    Abstract:
    Blood samples from 2,310 mature sheep in 3 Idaho range flocks were examined by agar gel immunodiffusion to determine the prevalence of ovine progressive pneumonia. The prevalence ranged from 58% for all ages combined in one flock to 90% of cull ewes in another flock. Age-specific prevalence rates increased from 16% in yearlings to 83% in ewes greater than or equal to 7 years old. Rambouillet sheep had a significantly (P less than 0.01) lower prevalence than sheep of 5 other breeds, whereas one-half Finnsheep crosses had a significantly (P less than 0.01) higher prevalence than sheep of other breeds. Within breed and age, there was no significant difference in reproductive performance between seropositive and seronegative ewes.
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