All the more reason to get horses off commercial feed…

Sweets Make Young Horses Harder To Train, Study Finds
ScienceDaily (Aug. 19, 2008)

Young horses might be easier to train if they temporarily lay off the sweets, according to a Montana State University (MSU) study that tracked behavior of 2-year-olds in training and compared it to their nutrition program.

The extra energy provided by sweet feed during the early stages of training made the horses in MSU’s study more disobedient and fearful than horses that only ate hay, said Jan Bowman, MS, PhD, an animal nutritionist at MSU.

The study involved 12 closely-related Quarter Horses that came from one Idaho ranch, Bowman said. Wade Black, instructor of the MSU Colt Starting class and one of Bowman’s graduate students, trained the horses for three weeks, five days a week at MSU’s Miller Livestock Pavilion. Half the horses ate only hay, which was a mixture of grass and alfalfa. The other horses ate five pounds of sweet grain a day in addition to the hay.

Both groups ate as much hay and drank as much water as they wanted.

Each horse wore a pedometer adjusted to its stride and attached with an Ace bandage to its left front leg above the knee. They also had a combination wristwatch-heart monitor hanging from their saddles. The watch displayed minimum, maximum, and mean heart rates detected by an electrode belt.

Black trained the animals for 30 or 40 minutes a day without knowing which animals had eaten grain and which ones hadn’t, Bowman said. She and Black also recorded heart rates and the number of steps the horses took during training. They assigned scores for behaviors displayed, including obedience, get-up-and-go, and separation anxiety.

“Results suggest that trainers under time constraints could increase their training effectiveness during the early stages of training by not feeding excess dietary energy,” Black wrote.

Bowman and Black conducted some of the experiments during the summer of 2007. Black presented their findings to the American Society of Animal Science in June this year.

He is still analyzing some of the data to see how the grain affected the horses’ adrenaline during training.
The study doesn’t mean that trainers should keep grain away from horses forever, Bowman said. They might consider withholding it just during the early weeks of training.

Bowman noted that all of the horses in MSU’s study gained weight during the study. It didn’t matter if they ate hay alone or hay with grain.

Their paper will be submitted to the Journal of Animal Science.