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A proven probiotic for digestive support

10 reviews. 4.9 / 5
Guest - 19/12/2023 12:51
Good value product that makes a difference
Guest - 05/12/2022 09:01
Great product............
Michelle - 02/06/2021 21:47
Keeps my horses’ tummies settled.
Trusted Feefo Customer - 18/12/2020 11:00
Mijn paard doet het er goed op!
Trusted Feefo Customer - 17/10/2020 09:33
Ben erg tevreden over het product! Mijn paard doet het er goed op, veel minder last van mestwater, slappe mest en een blij paard!
Emma - 08/07/2020 20:33
I have only just started using the supplement, but looks like a good quality product.
Trusted Feefo Customer - 02/01/2020 14:57
As with all other purchases from Feedmark, I never have to worry about receiving short-dated supplies.
Trusted Feefo Customer - 04/12/2019 14:47
echte 1026-Hefe
Michelle - 30/03/2019 22:28
Keeps my horses’ tummies settled in the spring / summer
Trusted Feefo Customer - 22/03/2019 19:49
Consistent quality makes this my first-choice probiotic culture.  We have added this to our Shetland Pony's feed for the past 20 years and, at 33 years of age, he has no digestive issues whatsoever.

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Feeding Guide

Weight of Horse/Pony Amount per day                                    
Up to 400kg 1 ½ scoops
Over 400kg 3 scoops
1 level (5ml) scoop of Yea-Sacc® weighs approximately 4g

Feed supplements should be fed according to body weight. Introduce to the horse's diet gradually, splitting between feeds (when applicable).

Yea-Sacc® is a complementary feeding stuff for equine animals. Feedmark uses nothing in the formulation of this product that contravenes competition rules.

Nutrition Information

A probiotic live yeast culture for use in horses. Yea-Sacc® has undergone substantial research to confirm its effectiveness.  Probiotics supply the horse’s hindgut with an additional supply of beneficial microbes that are essential for efficient fermentation of fibre, and feeding YeaSacc® has been shown to improve digestion of fibre in the diet, enabling the horse to get the most out of their forage.


Yea-Sacc® live yeast (Saccharomyces cerevisiae CBS 493.94)


ZOOTECHNICAL ADDITIVES (per kg): Yea-Sacc® live yeast (4a1704 Saccharomyces cerevisiae CBS 493.94) 250,000,000,000cfu.


Crude protein 22.2%, Crude oils & fats 2.9%, Crude fibre 5.3%, Crude ash 5.0%, Sodium 0.2%

What is Yea-Sacc®?

Yea-Sacc® is a live yeast derived from the Saccharomyces cerevisiae strain of yeast. It is the only strain of live yeast that is licensed for use in horses. 


How does Yea-Sacc® work? 

Yea-Sacc® improves the environment in the hindgut by using up oxygen to create a more favourable enviornment for the hindgut microbes. This enhances the activity of the fibre digesting bacteria. 


When would I feed Yea-Sacc instead of BioPro®

Yea-Sacc® is a probiotic, a live culture which adds to the 'good' bacteria in the hindgut. It is suitable for all horses, but for those with specific digestive issues it is advisable to feed BioPro® which is a prebiotic and probiotic supplement. Yea-Sacc® is a good value option for horses that require hindgut support.