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Pregnancy Diagnosis in Horses
  by Robert N. Oglesby DVM

Introduction

Introduction » Experience Counts » Ultrasound » Pregnant Mares Do Not Return to Heat (Usually) » Rectal Palpation » Hormonal Changes » Visual Assessment » More Info 

The determination of pregnancy in a broodmare is an important aspect of any breeding program. With natural service these are fairly easy to determine, on most mares. But with the increase of artificial insemination (AI) many breeding mares today are on farms where there is no stallion on site to constantly tease mares. Even when there is a stallion and good teasing practices are used, a percentage (appx. 10%) of normal mares may be difficult to tell if they have come back into heat following breeding. Because a mare only ovulates once every 21 days the accurate timing of insemination and the early detection of non-pregnant mares helps prevent a late season foal or missed season all together. This article discusses the various techniques available, including hormonal changes for checking miniature horses, to the horseman and veterinarian for a pregnancy diagnosis in equines and their relative advantages and disadvantages. Links to related articles and scientific reports are also present.

Note: the following article discusses different ways to determine if a mare is pregnant. The techniques are presented roughly in order of how early they can detect pregnancy.
      ~Word Count: 1739 words (The average magazine page contains about 600 words);
      ~Last Updated: April 17, 2011;

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Discussions on Pregnancy Diagnosis
  Titles Subtopics Posts Updated
iconEstrone Sulphate TestingMay 16, 09
iconFounder? or Pregnant?May 3, 09
iconComing into season after losing foal?Oct 12, 08
iconMammary gland development in early pregnancyAug 3, 08
iconMare 4 months in foal showing in season (?)Dec 3, 07
iconClarification on the blood ES test Oct 18, 06
iconMare is too far alongOct 6, 06
iconPregnant mare acts as though in heatAug 30, 06
iconEstrone Sulfate levelsJan 11, 06
iconPregnant 2 year old MustangJul 12, 05
iconUltrasound at day 18 appears to be in foal but has ademaMay 2, 05
iconPregnacy check at 110 days post ov.12 Aug 28, 04
iconPregnant?Jun 22, 04
iconPregnant - yes/no/maybe?Feb 23, 04
iconPregnant mare discharging a bit of bloodApr 24, 03
iconQuestion about palpation at 45 daysApr 17, 03
iconWas drug safe if she's pregnantApr 4, 03
iconSURPRISE!!!!!Feb 20, 03
iconCan a mare come show signs of estrus while pregnant?Jan 23, 03
iconIs she pregnant?17 Jul 25, 02
iconTime frame for UltrasoundJul 5, 05
iconPregnancy10 Aug 9, 01
iconPregnant mare with dischargeJun 12, 03
iconMare ultrasounded at 14 days but....Jul 18, 01
iconIs a blood test 100% accurate?Feb 19, 04
iconPregnancy testing.Feb 4, 01
iconFalse PregnancyFeb 19, 04
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