SEROLOGIC PREVALENCE OF OVINE PROGRESSIVE PNEUMONIA IN A WESTERN RANGE FLOCK OF SHEEP

Google Scholar
  • 1 January 1981
    • journal article
    • research article
    • Vol. 178  (7) , 708-710
Abstract
Of 254 sheep examined for antibodies to the virus of ovine progressive pneumonia, 162 (63.8%) were seropositive. The mean age of the seropositive ewes was 4.9 .+-. 1.8 yr, significantly greater than that for the seronegative ewes (4.1 .+-. 2.3 yr). The age-specific prevalence increased with ewe age, from 25% among yearling ewes to 85% among 7 yr old ewes. Seropositive ewes produced more pounds of live lamb at birth than did seronegative ewes.