Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259177
Title: Cervico-vaginal prolapse in the preparturient ewe : an epidemiological and clinical study
Author: Knottenbelt, Derek Charles
ISNI:       0000 0001 3601 1586
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1990
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Abstract:
Two hundred and four cases of pre-parturient cervico-vaginal prolapse (CVP) were examined in general practice over three years. An overal incidence of 1.34% was found with some annual variation within flocks which was most evident in upland or hill flocks. There was no true breed disposition but the Kerry, Llyn, Suffolk and Texel breeds (and their crosses) were slightly overrepresented. Affected ewes were of all ages and body conditions. Exercise, weather and topography did not affect the incidence or the severity. Most cases (80%) occurred in the last 7 days of gestation and overall ewe mortality was found to be 24% of affected ewes. The progeny of ewes affected by CVP showed a high incidence of CVP (19%). While affected ewes carried significantly more lambs than control ewes (2.4 lambs/ewe respectively) the number of lambs carried did not affect the severity. Ewes affected by the more severe forms of CVP carried heavier lambs than either the control ewes or the ewes affected by the milder forms of CVP. Lamb survival was worse amongst the more severely affected ewes. Tenesmus and rectal prolapse were often encountered. The relief of tenesmus was an important part of effective therapy. Post-mortem examination showed no ewe to have a ruptured bladder but vaginal rupture, which carried a poor prognosis for both ewes and lambs, was a complication of CVP in 13 cases. Eleven treatment methods were compared and none was found to give better lamb or ewe survival than the others except elective caesarian section which improved ewe survival at the expense of lamb survival. Delayed caesarian section resulted in an improved lamb survival but a reduced ewe survival. Ewes subjected to elective caesarian section showed a reduced conception rate at the next breeding season. Inadequate cervical dilation ( ringwombi) was more common in affected ewes than in controls (17% and 0% respectively) but there was no increase in the proportion of ewes which suffered from post-parturient uterine prolapse. Postpartum recurrence of CVP occurred in 2% of cases. Affected ewes showed a neutrophilia with left-shift and an elevated hydroxybutyrate concentration when compared to control ewes. Serum calcium and inorganic pnosphate were reduced in proportion to the severity of CVP. Blood urea was frequently elevated and 80% of ewes with urea concentrations above 20 mmol/1 died. Plasma progesterone levels were higher than in control animals but oestrogen concentrations were lower. The possibility of an hormonal aetiology related to fecundity, environment, management and anatomy is not discounted.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (D.V.M.S.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.259177  DOI: Not available
Keywords: Veterinary sciences & veterinary medicine
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