Newer FAQ’s and Articles About Equine Reproduction (Horse Breeding)

– A selection of equine reproduction – horse breeding – articles more recently presented on the website on a variety of topics

EQUINE-REPRODUCTION.COM, LLC ARTICLES

In addition to the ISSR 8 and ISER XIII “snippet” summaries shown below, we of are course ongoing in production of our own new articles relevant to equine reproduction and the horse breeding process:

Bacterial Infection of a Stallion's Reproductive Tract - Case Report

Bacterial Infection of a Stallion's Reproductive Tract - A case report of the bacterial infection of a stallion's reproductive tract with images and outcome......

Counting Sperm With a Hemocytometer

Counting Sperm With a Hemocytometer Counting sperm to determine concentration is an essential part of evaluating or processing semen , and counting sperm with...

Predicting Foaling in the Mare

Predicting Foaling in the Mare: What Actually Works Kathy St. Martin and Jos Mottershead Waxing: The Least Reliable Sign There are many signs predicting...

Processing Equine Semen

Processing Equine Semen It's not difficult to correctly process equine (horse) semen for on-farm insemination or shipping, but it is one about which we often receive...

The Uterine Cytology Slide

Preparing the Uterine Cytology Slide - Pre-breeding diagnostics should include the simple, rapid and easy-to-perform uterine cytology slide, which takes only about...

ISSR 8

We are pleased and proud to be invited to present “snippets” from the 8th International Symposium on Stallion Reproduction, held in Spain in February 2025. These are being presented by permission of and in conjunction with release by the International Society of Equine Reproduction.

Comparing DNA Damage Assays

Comparing DNA Damage Assays in Equine Sperm Preservation Background & Purpose Preserving sperm DNA integrity is critical for successful equine assisted...

Cryopreservation Extenders Content

Egg Yolk Concentration, Cryoprotectant Type, and Cooling Rate Effects on Post-Thaw Stallion Sperm Quality Cryopreservation extenders vary widely in egg yolk content...

Dismount Semen Sample Evaluation

Dismount Semen Sample Evaluation, Post-Mating Antibiotics, and Mare Clinical Parameters Background Purpose In Thoroughbred breeding, in-hand mating is the...

Donkey Semen Cryopreservation

Donkey Semen Cryopreservation with Different Permeable Cryoprotectants Optimizing cryoprotectant selection for donkey semen cryopreservation is critical, as excessive...

Effect of Semen Extenders on Pre-Freeze Shipped Semen

Protective Effect of Semen Extenders on Pre-Freeze Shipped Semen During Refrigeration at 5°C for 24 Hours Refrigerating stallion semen at 5°C for 24 hour shipment p...

Effect of Testicular Heat Insult

The Effect of Testicular Heat Insult on Hormones and Sperm This study investigated the effect of testicular heat insult on hormones and  spermatological consequences ...

Epididymal Sperm Collection and Processing

Epididymal Sperm Collection and Processing Epididymal sperm collection and processing represent the last opportunity for genetic material rescue following sudden...

Fertility Decline in Breeding Stallions

Fertility Decline in Breeding Stallions This retrospective study examined the etiological factors contributing to fertility decline in breeding stallions and...

Pharmacologically Induced Ejaculation in Stallions

Pharmacologically Induced Ejaculation in Stallions Since Drs. McDonnell and Love pioneered research into Pharmacologically Induced Ejaculation in Stallions in...

Post-Thaw Sperm Quality Effect on ICSI

Post-Thaw Sperm Quality and Blastocyst Production Following Intracytoplasmic Sperm Injection in Mares Post-thaw sperm quality effect on ICSI outcome is well-recognized,...

Pre-Freeze Semen Centrifugation Extenders

Pre-Freeze Centrifugation Extenders Selection for Optimizing Equine Semen Cryopreservation Cryopreservation exposes spermatozoa to significant physical and chemical...

Predicting Breeding Soundness in Pre-, Peri- and Postpubertal Colts

Predicting Breeding Soundness in Pre-, Peri- and Postpubertal Colts Background: The study aimed to identify parameters for predicting breeding soundness...

Prolonged Storage of Post-thaw Semen

Storage Conditions Affecting Prolonged Storage of Post-thaw Semen Field-based use of cryopreserved stallion semen is often limited by the equipment and expertise...

Protocol for frozen semen insemination in mares

Timing Protocol Modification for Frozen Semen Insemination in Mares There are in use a variety of protocols for frozen semen insemination. This research compares...

Pseudomonas aeruginosa Therapy in a Stallion

Novel Pseudomonas aeruginosa Therapy in a Stallion — Case Report Although embedded pathogenic presence in the stallion's reproductive tract is a comparatively r...

Seminal Plasma Impact on Foal Growth

Is there a Seminal Plasma Impact on Foal Growth? This study investigated the downstream developmental consequences of seminal plasma (SP) exposure — or its a...

Stallion Dismount Latency and Pregnancy Rates

Stallion Dismount Latency and Pregnancy Outcomes in Thoroughbred Horses In Thoroughbred natural service breeding, dismount semen — residual urethral semen collected a...

ISER XIII

Three “Js” – Professor John Newcombe, Dr. Juan Cuervo-Arango, and our own Jos Mottershead

We were extremely fortunate in that our lead lecturer Jos Mottershead was invited to attend the 13th International Symposium on Equine Reproduction (ISER XIII) in Brazil as a delegate. This has afforded us the opportunity to present new information to the breeding public – be they veterinarians in the field, lay breeders, or the many others for whom the information would be useful – via the website, our short courses and individual tuition, as well as the EquineRepro Facebook Group that we operate. In this latter media, we presented weekly posts with information which has immediate clinical value, and we are re-presenting those posts here on the website for our viewers.

Altrenogest Effect on Progesterone

Is it True Altrenogest Has an Effect on Progesterone Production? Pregnant and embryo recipient mares are often treated with supplemental progestins - commonly...

Badly Behaved Gelding

The Badly Behaved Gelding - Hormonally Driven or Not? "That is a badly behaved gelding - he must be 'proud cut'" or "I bet they left some testicular tissue in...

Blue Light

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...

Can Embryo Transfer Success Rates be Improved?

Can Embryo Transfer Success Rates be Improved? Embryo transfer success rates are recognized as having a variable outcome dependent upon technician technique as...

Dead Sperm

Dead Sperm Do Not Cause Greater Uterine Immune Response! We know that sperm are the primary instigator for initiating the mare's post-breeding uterine inflammatory...

Diagnosis of Placentitis

Diagnosis of Placentitis - Are Inflammatory Markers Useful? Placentitis is - literally and practically - "inflammation of the placenta" ("itis" as a suffix...

Endometrial Biopsy in the Mare

Endometrial Biopsy in the Mare - is one sample enough? An endometrial biopsy in the mare is a useful diagnostic to determine cellular health of the uterine lining...

Endometrial Cup Regression

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...

Estimate Fetal Age

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...

Frozen Semen for Standard IVF?

Frozen Semen for Standard IVF? In September of 2022, Felix et al. (University of Pennsylvania, New Bolton) published a paper which detailed the use of fresh...

Monitoring for EVA

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...

N-acetylcysteine Improves Diagnostic Reliability

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...

Novel Treatment for Endometritis

Ozonated Sunflower Oil for Endometritis Treatment The overuse of antibiotics in medicine today - including equine reproduction - has led to searches for alternative...

Obese Mares

Obese Mares Have More Problems Than We Thought! It has been previously documented that obese mares have a higher tendency towards early embryonic death, particularly...

Older Subfertile Mares

Improve Pregnancy Rates in Older Subfertile Mares! How can one improve pregnancy rates in older subfertile mares? This category of mare is notorious for having...

Ovulatory Temperature Changes

Can Mare Temperature Changes Predict Ovulation? Temperature changes to predict ovulation are used in multiple species, including humans. The question has been...

Oxytocin Use to Support Pregnancy?

Oxytocin Use to Support Pregnancy Instead of Regumate (Altrenogest)? It seems initially counter-intuitive to consider oxytocin use to support pregnancy instead...

Vitrification of Larger Embryos

Vitrification of Larger Embryos Successful vitrification of larger embryos - those >300µm - has typically not been achieved previously without use of the comparatively ...