Infectious Ovine Abortion

Ovine Listerial Abortion.

“…The percentage loss of lambs also appears to be very variable, as in this caw it was 16% whereas Paulsen and Moule (1953) quote cases varying between 3 % and 16%.…”

“…A point of considerable interest however, is that losses in lambs were confined entirely to those prematurely born dead and no rarly post-natal deaths occurred. Both Hindmarsh and Blumer (1932) and Paulsen and Moule (1953) report that no premonitory svmptoms were observed in their cases. The stage of pregnanvy at which the abortions occur appears to be extremely variable, as in this case they first appeared during the period of 3-6 weeks before lambing whereas Charles (1950) stated that in his series, abortions all occurred during the last week of pregnancy.…”

“…The stage of pregnanvy at which the abortions occur appears to be extremely variable, as in this case they first appeared during the period of 3-6 weeks before lambing whereas Charles (1950) stated that in his series, abortions all occurred during the last week of pregnancy. However Paulsen and Moule (1953) state that abortions may occur as early as the twelfth week of pregnancy or that lambs map be carried to full term.…”

“…I n Australia, ovine abortions due to Listeria infection have been recorded in New South Wales by Hindmarsh and Blumer (1932), in Queensland (Moule-1953) and have been suspected in Victoria ( Paulsen and Moule-1953) ; the outbreak recorded by Hindmarsh and Blumer (1932) being the first recorded i n this country. Olsen (1954) states that abortions do not always occur as part of an outbreak of the nervous type and Paulsen and Moule (1953) observed that the ewes in their series with the fetal or uterine type did not show the nervous symptoms associated with the central nervous system form of listeriosis. The only case apparently recorded, in which the nervous and fetal types of listeriosis were observed concurrently, was in a bovine case reported by Smith et al (1955).…”