Resumen:
Despite the extensive availability and use of plant extracts as feed additives in various livestock species,
peer-reviewed and scientific evidence of their usage in horses is lacking. This article dealt with the review
of reports from recent studies investigating the usage of plant bioactives or extracts in horse
nutrition. For the time being, several herbs, either alone or in composites, are being commercialized and
openly available in horsemarket stores, which makes it difficult and confusing for horse owners and
veterinarians to make a justifiable choice. Usage of ginger extract as a feed additive in sport horses is
encourageable as it manages to attain quick recovery after exhaustion in racing and jumping events.
Garlic, ginseng, primerose, and rose hip possess potent antioxidative properties, and their supplementation
in a regular diet may lessen the chance of occurrence of oxidative stress-related diseases. Owing to
their cytoprotective and mucus-stimulatory effects, licorice and Aloe vera extracts have potentiality as
feed additives in Standardbred and Thoroughbred racehorses, as they are more prone for equine gastric
ulcer syndrome. Echinacea is able to stimulate the equine immunocompetence on addition to the regular
diets of equine species. Besides the anti-inflammatory effect, devils claw possess anorexigenic effect,
which can limit feed intake, thus keeping the body condition score in check and avoiding obese-related
health problems in horses. Regularizing flaxseed meal or its extract as a dietary supplement may support
healthy skin and coat condition due to the presence of omega-3 fatty acids as an active component. Aloe
vera, well known for cytoprotective and mucus-stimulatory effects, is found to be efficient in protecting
the gastrointestinal tract against ulcers or other disorders on administering as a dietary supplement to
equines, but the extent of effect depends on the dosage and extent of supplementation. Although,
theoretically plant extracts application is safer compared with synthetic antibiotics or drugs, it does not
mean they are completely safe, and few considerations should be given for dosage of the drug, period of
administration, apart from monitoring parallel drugs given to prevent herb-drug interactions. The plant
extracts with potent benefits, and not tested in horses have to be evaluated with a primary objective to
verify the negative side effects, if any, followed by standardization of the dosage