Category Archives: mare

N-acetylcysteine Improves Diagnostic Reliability

Posted: | November 26, 2023

Clean Culture and Cytology – Perhaps Not So Clean? For many years, the standard pre-breeding evaluation included a uterine swab culture alone. It was then determined that allegedly “clean” mares were not becoming pregnant, and further investigation showed that there were inflammatory cells present in the uterus, indicating some sort of irritant – usually a pathogen missed with… Read More »

Diagnosis of Placentitis

Posted: | November 19, 2023

Diagnosis of Placentitis – Are Inflammatory Markers Useful? Placentitis is – literally and practically – “inflammation of the placenta” (“itis” as a suffix indicates inflammation). Use of assays for inflammatory markers in the mare – in particular Serum Amyloid A (SAA) – have been previously suggested as possible diagnostic tools for use in the identification of placentitis. Inflammatory… Read More »

Ovulatory Temperature Changes

Posted: | November 12, 2023

Can Mare Temperature Changes Predict Ovulation? Temperature changes to predict ovulation are used in multiple species, including humans. The question has been asked of the mare in the past, Bowman et al. identifying a drop in temperature using a temperature-reporting microchip following ovulation which occurred in the period from midnight to 9:00 am. Diurnal fluctuations were also observed,… Read More »

Novel Treatment for Endometritis

Posted: | November 4, 2023

Ozonated Sunflower Oil for Endometritis Treatment The overuse of antibiotics in medicine today – including equine reproduction – has led to searches for alternative novel treatment for endometritis in the equine, as well as in many other facets of the medical field. In human medicine and dentistry, ozone has been shown to be capable of killing Gram-positive and… Read More »

Endometrial Cup Regression

Posted: | October 27, 2023

Is it Possible to Cause Earlier Regression of the Endometrial Cups to Permit a Return to Breedable Estrus in the Mare? Unique to the early equine pregnancy is the invasive trophoblast of the chorionic girdle and its formation of the endometrial cup cells which secrete equine chorionic gonadotropin (eCG). This invasion occurs between days 35–38 after ovulation. The… Read More »

Blue Light

Posted: | October 22, 2023

Does Maternal Exposure to Blue Light Affect Foal Development at Maturity? Because humans like to try and defy nature – January 1st being the “birthday” in the northern hemisphere, and only marginally better August 1st in the southern – we are often attempting to force earlier onset of cyclicity in the seasonally anestrus mare using lighting programs. Several… Read More »

Estimate Fetal Age

Posted: | October 15, 2023

A New Method to Estimate Fetal Age in the Mare Sometimes there arises a need to estimate fetal age in the mare, for which a breeding date perhaps is unknown. Several methods have been previously identified, such as measurement of the fetal eye[1][2], or biparietal diameter, eye approximated volume, fetal aortic diameter and femur length[3], among others. These… Read More »

Altrenogest Effect on Progesterone

Posted: | October 7, 2023

Is it True Altrenogest Has an Effect on Progesterone Production? Pregnant and embryo recipient mares are often treated with supplemental progestins – commonly Altrenogest in the oral form Regumate, or injectable in one of several longer-acting commercial preparations – in an expectation of “low progesterone” levels. There is a significant question as to what number should be applied… Read More »

Monitoring for EVA

Posted: | September 23, 2023

Does Routine Monitoring for EVA Make a Difference? With the announcement this week of an outbreak of equine viral arteritis in PEI in Canada, a very reasonable question to ask is “does routine monitoring for EVA make a difference?” At the recent ISER meeting in Brazil, Kaps et al. reviewed the effects of monitoring and management practices on… Read More »