Non-infectious causes of abortion include rough handling, fighting among animals, inadequate nutrition, and plant poisons. Ewes infected with Vibrio typically abort during the last 6-8 weeks of pregnancy or give birth to weak or dead lambs. Once a ewe aborts, she is immune to the disease.
What are the two major causes of abortion in sheep?
Campylobacteriosis. Campylobacter fetus subspecies fetus and Campylobacter jejuni are common causes of abortion, particularly where sheep are managed intensively leading to heavy contamination and unhygienic environments during late gestation. The main source of infection is purchased carrier sheep.
Can sheep miscarry?
Enzootic abortion (EAE) is caused by the bacteria Chlamydophila abortus and abortion occurs in the last 2-3 weeks of pregnancy, no matter when the ewe was exposed in that period. Once infected, a ewe carries the bug for life and will shed around ovulation, providing a perfect tool to infect a working ram.
How do I know if my ewe is aborted?
Aborting ewes show variable clinical signs, including fever, depression, and anorexia, and some may succumb to septicemia. There is some necrosis of cotyledons and the intercotyledonary areas, and the fetus is usually autolyzed. Mummification is possible.
What causes stillbirth in sheep?
Abortions and stillborn lambs are usually caused by an infection like toxoplasmosis, vibriosis, chlamy diosis or leptospirosis. Lambs may also be born weak and die shortly after birth as a result of these infec tions. Infections are often a result of poor farm hygiene or poor biosecurity.
How long does it take for a sheep to abort?
Once infected a ewe/lamb will carry the infection until she next becomes pregnant and will then abort, usually in the last 2-3 weeks of pregnancy.
How do sheep increase fertility?
- the use of teasers and the ‘ram effect.’
- short term flushing with a high energy diet.
- use of products such as ‘Ovastim’ to increase ovulation rates.
- use of melatonin containing products which ‘trick’ the animal’s reproductive system into thinking the days are shorter which triggers ewes to cycle.
What is Chlamydia in sheep?
The organism that causes chlamydiosis is Chlamydia psittaci. Among flocks where the disease has been present for several years, most of the older ewes are immune and the annual abortion rate is around 1 to 5 percent (primarily due to ewe lambs and yearling ewes aborting during their first pregnancy).
What is Vibriosis in sheep?
This disease is caused by a bacterium, but it is not the same organism that causes the infection in cattle. Ewes afflicted with vibriosis abort in late pregnancy or occasionally give birth to dead or small, weak lambs. Ewes rarely show symptoms before aborting.
How do sheep get campylobacter?
Susceptible ewes ingest bacteria from contaminated pasture or water. The bacteria enter the ewe’s bloodstream and pass to the uterus where they multiply in the placenta, infect the placental membranes and cause abortion of the developing lamb.