Manual reduction of multiple embryos in the mare: The effect on subsequent pregnancy outcome

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• 作者：M.C.G. Davies Morel^a ; ^{mid@aber.ac.uk} ; J.R. Newcombe^b ; M. Lauber^a
• 关键词：Mare ; Multiple pregnancy ; Pregnancy rate ; Manual reduction multiple pregnancy ; Twin pregnancy
• 刊名：The Veterinary Journal
• 出版年：2012
• 期刊代码：338_10900233
• 类别：med
• 出版时间：June, 2012
• 卷：192
• 期：3
• 页码：322-325
• 文件大小：162 K

摘要

To determine whether manually reduced multiple pregnancies (MPs) are at a greater risk of pregnancy loss than single pregnancy (SP) in mares, and to examine if a difference exists in the timing of pregnancy loss between manually reduced MPs and SPs, 1916 Thoroughbred mares were ultrasonically monitored every 2 days during oestrus to confirm ovulation, and up to Day 40 post-ovulation to confirm pregnancy. Ultimate pregnancy outcome was ascertained from the General Thoroughbred Stud book and classified as live foal (LF), early abortion (EA; Days 40-150), slipped foal (SF; Days 150-term), and barren (B; Time of pregnancy loss unknown).

Significantly (P < 0.05) more SPs failed (17.23%; 226/1312) than manually reduced MPs (13.41%; 81/604). Both SPs and MPs were at greatest risk of being lost as EA (72.16%; 127/176 and 61.67%; 37/60, respectively) compared to SF (27.84%; 49/176 and 38.33%; 23/60). There was no significant difference in the time of greatest risk of pregnancy loss between manually reduced MPs and SPs. It was concluded that owners and veterinarians can be assured that manual reduction of MPs does not increase the risk of pregnancy loss above those associated with SPs.