Mare Reproductive Loss Syndrome (MRLS)

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Article

Eastern Tent Caterpillars on the Move in Central Kentucky

May 10, 2014

Experts advise farm managers to ensure pregnant mares do not come in contact with crawling caterpillars.... Read More

Article

Winter No Threat to Eastern Tent Caterpillar Eggs

March 14, 2014

The Eastern tent caterpillar has been implicated as the cause of mare reproductive loss syndrome (MRLS).... Read More

Viable Eastern tent caterpillar egg masses will be partly or completely covered with a brownish coating, without obvious holes. They are found on twigs of cherry and other trees on twigs.

Article

Eastern Tent Caterpillar Outlook for Spring 2013

February 13, 2013

Experts report that the eastern tent caterpillar egg hatch will likely begin in mid-March in Central Kentucky.... Read More

Straw, the byproduct of grain production, is economical horse bedding. While it’s not as absorbent as other options, straw is often recommended for foaling stalls because it won’t stick to wet newborns.

Article

Fertilization and Early Pregnancy Loss in Mares

April 27, 2012

One of the most important causes of embryo loss during early gestation is post-breeding endometritis.... Read More

Article

Eastern Tent Caterpillar Egg Hatch Under Way in Central Ky.

March 24, 2012

Experts report that this year's Eastern tent caterpillar egg hatch is about a week ahead of average.... Read More

Article

Eastern Tent Caterpillars Hatching Earlier This Year

March 01, 2012

Research has proven the caterpillars caused outbreaks of mare reproductive loss syndrome (MRLS).... Read More

Article

Proper Use of Antibiotics for Uterine Infections (AAEP 2011)

February 01, 2012

Ensure a bacterial infection that will respond to antibiotics is actually present before beginning treatment.... Read More

Article

Time to Assess Eastern Tent Caterpillar Populations

April 21, 2011

Eastern tent caterpillars (ETC) were identified as the cause of foal loss during the mare reproductive loss syndrome outbreaks in 1999-2001. Over the last three years, ETC populations in Central Kentucky have been increasing gradually but there are ... Read More

Article

Eastern Tent Caterpillar Egg Hatch Under Way

March 21, 2011

Experts report that Eastern tent caterpillar eggs have begun hatching in Central Kentucky, just as leaf buds are swelling on wild cherry trees. While it is too early to tell what 2011 caterpillar numbers will be, populations have been increasing ... Read More

Article

Second Annual Breeders' Short Course Recap

January 27, 2011

The University of Kentucky College of Agriculture partnered with the University of Minnesota (U of M) to present the 2nd Annual Kentucky Breeders' Short Course held Jan. 21 and 22 in Lexington. The first day of the course was designed for ... Read More

Article

Equine Abortion of Unknown Cause

January 22, 2011

Pregnancy loss is relatively common in horses. Only 80% of mares bred give birth to a live foal at term. The loss of the developing foal (fetus) during gestation can fall under one of two categories: early embryonic loss, in which the loss of a fetus... Read More

Article

MRLS Research Stresses Possible Convergence of Climate, Management Factors

July 21, 2010

The cases of mare reproductive loss syndrome (MRLS) that Lexington, Ky., experienced in 2001 were a symptom of many issues converging, according to laboratory medicine specialist Jennifer Taylor of Melbourne, Australia. Taylor presented her findings ... Read More

Article

CEM: Lower-Cost Stallion Testing Continues

May 20, 2010

In an effort to show that Contagious Equine Metritis (CEM) does not exist or is at very low levels in the US equine horse population, the USDA is offering lower-cost testing to owners of active breeding stallions through August. It is part of a... Read More

Article

New Knowledge Comes Through New Research

April 25, 2010

Eastern tent caterpillars are numerous on our small central Kentucky farm this year. They have defoliated the spring leaf growth on most of the wild black cherry trees and are now crawling around in great numbers on board fences, stone walls, a... Read More

Article

Eastern Tent Caterpillar Egg Hatch Under Way, Numbers Up Again

April 23, 2010

Experts report Eastern tent caterpillars are hatching in central Kentucky in increasing numbers.

"Some tents are the size of baseballs now, so they will be easy to see," said Lee Townsend, PhD, and University of Kentucky Co... Read More

Article

Eastern Tent Caterpillar Numbers Up Again

April 19, 2010

Experts in Kentucky report that eastern tent caterpillar numbers are up for the third consecutive year, although populations vary from location to location.

According to Lee Townsend, University of Kentucky College of Agriculture entomologist, ... Read More

Article

MRLS Foal Losses in Kentucky Increased Slightly in 2009

August 12, 2009

Between May 5 and June 15, the Livestock Disease Diagnostic Center (LDDC) diagnosed 13 foal loss cases caused by mare reproductive loss syndrome (MRLS) in Central Kentucky. This number was up slightly from 2003-2008 when only three to five cases... Read More

Article

Kentucky Reports Mare Reproductive Loss Syndrome Cases

May 13, 2009

The University of Kentucky Livestock Disease Diagnostic Center (LDDC) reported today (May 13) that two fetal necropsy cases had findings consistent with mare reproductive loss syndrome (MRLS), the disease that in 2001-2002 in Kentucky caused an... Read More

Article

MRLS: Eastern Tent Caterpillar Numbers Up

March 25, 2009

Eastern tent caterpillars have begun hatching in Central Kentucky--and their population numbers are trending up.

"Populations of the Eastern tent caterpillar have increased noticeably over the past three years," said Lee Townsend, PhD,... Read More

Article

Mare Reproductive Loss Syndrome Update

June 03, 2008

An abortigenic disease known as mare reproductive loss syndrome (MRLS ) significantly impacted the horse industry in the Ohio Valley in late April and early May, 2001 and 2002. In 2001, approximately 25% of all pregnant mares aborted within several... Read More

Article

MRLS: Caterpillar Population Up Sharply from 2007

May 09, 2008

Experts with the University of Kentucky (UK) report that Eastern tent caterpillars are now wandering in the area, and population levels are among the highest they've seen since the 2001, when mare reproductive loss syndrome (MRLS) hit Central... Read More

Article

MRLS: Tent Caterpillars Hatch in Central Kentucky

April 11, 2008

Experts have reported that Eastern tent caterpillars are developing normally this spring and have just completed the egg hatch stage. Controlling the caterpillars is vital to area horse farms, as University of Kentucky research has strongly linked... Read More

Article

MRLS: Eastern and Forest Tent Caterpillars Currently Feeding

April 06, 2007

The time is right for horse farms to implement control strategies. University of Kentucky experts report that eastern tent caterpillars and forest tent caterpillars are developing normally this spring with egg hatching complete and... Read More

Article

MRLS Cases Confirmed in New Jersey

September 01, 2006

A horse farm in Northern New Jersey experienced high abortion rates in early June in pastures where there was an abundance of Eastern tent caterpillars.

Samples from those aborted fetuses were sent to the University of Kentucky's Livestock... Read More

Article

Researchers Contemplate Role of Vesiviruses in MRLS

July 12, 2006

Oregon State University (OSU) researchers announced last month that they linked vesiviruses to abortions seen during Central Kentucky's bout with mare reproductive loss syndrome in 2001 and concluded that vesivirus-specific reagents should be... Read More