Process Management

News last update:6 Aug 2012

Mysterious death horses probably solved

Dr. Don Hoenig, state veterinarian, was not sure if he would ever get a lead on what killed 10 horses from Searsport, Maine USA.

Monday afternoon, however, Hoenig heard from the University of Wisconsin about tests on a manure sample from one of the dead animals. The sample was collected two weeks ago during a necropsy performed at the University of Maine.

Monensin in manure
The results confirmed initial theories that grain toxicity was likely to blame for the deaths of 10 horses belonging to Kathy Hecht of Searsport. "They found a trace of monensin in the manure," said Hoenig. Monensin is an antimicrobial feed additive commonly found in cattle or poultry grain. The additive is potentially fatal to horses, however, because it damages their hearts. "You wouldn't normally expect to see any monensin in horse manure, because it shouldn't be there," said Hoenig.

The state's investigation into the deaths began the weekend of Feb. 17-18, when Hecht contacted Sherburne because her horses were dying one by one at her Mt. Ephraim Road residence. Because the horses died in a cluster, the investigation pointed to grain toxicity. Botulism was another possibility. Samples of feed that Hecht had on site at the time of the horses' deaths were tested, but showed no traces of the toxin. That eliminated the possibility that monensin was inadvertently added while the feed was being processed at a mill, and suggesting to Hoenig that a well-meaning individual might have fed the wrong grain to the horses.

To receive the AllAboutFeed newsletter click here.

Editor AllAboutFeed

Or register to be able to comment.