5 important points to avoid in horse feeding are being presented, which have triggered a lot of mixed reactions.
Are these statements regarding haylage too generalised?
Anyone who knows us, knows that we don’t believe in generalised answers. Especially from a therapeutic point of view, each horse must be considered and fed as an individual. We therefore answer most messages and questions with the following “…you can’t say that in general terms because we don’t know the horse and don’t have enough information” or “…you should take a detailed and holistic anamnesis”.
But: there are feedstuffs that can be generalised
and we do this deliberately. This is the case when a feed is not suitable for ANY horse, there are no exceptions. If we were to make a statement like “…for most horses…” instead of generalising, it would simply not be honest, but a lie. No exceptions to the points we have mentioned.
And yes, we know that there will probably be comments saying: “But I’ve been doing it this way for years and my horse looks good.” We understand there are plenty of horses that are fed this way and many of them look well.
But just because something works without problems does not mean that it is healthy or even beneficial to health. It is rather astonishing how long horses can compensate for incorrect and inappropriate feeding, because the survival instinct is ultimately stronger.
Let’s talk about this in a little more detail. In the following posts, we will go into the points mentioned and explain why these statements can be made across the board for all horses. In the next few articles, we will look at the topic of oil usage and the question of whether it is better to use organic or inorganic minerals to cover basic mineral requirements.
Haylage, brewer’s yeast and effective microorganisms in horse feeding
“Haylage, brewer’s yeast and Effective Microorganisms” are the topics of the next paragraph followed by explanation why they are not suitable to feeding your horses.
We will discuss these points together as they all relate to the problem faced by lactic acid bacteria. These are found in small quantities in the horse’s gastrointestinal tract, they find their way into the colon via the stomach. In a healthy well-functioning system, their numbers are balanced by Veillonellaceae bacteria, which immediately convert the lactic acid back into forms that can be utilised by the horse.
If additional lactic acid bacteria are reaching the large intestines, the balance is tipped, and acidosis occurs (hindgut acidosis). Scientists now consider this to be one of the main causes of metabolic disorders and diseases (for more information on this, see the nice review article by Rafat A.M. Al Jassim: The Bacterial Community of the Equine Gastrointestinal Tract and Its Relation to Fermentative Acidosis, Laminitis, Colic and Stomach Ulcers. Veterinary Clinics: Equine Practice: 25:2p199-215 from 2009).
Muhonen et al showed 2009 (Effects on the equine colon ecosystem of grass silage and haylage diets after an abrupt change from hay1 | Journal of Animal Science | Oxford Academic (oup.com)) that the amount of lactic acid bacteria increases rapidly when feeding haylage or silage, so that dysbiosis with an increase in lactobacilli and a drop in pH could be detected in horses within three weeks of starting to feed haylage or silage. The dramatic effects that an increase in lactic acid bacteria, especially Lactobacillus and Streptococcus, has on the health of the horse were already shown in 2008 by Milonovich et al (https://www.nature.com/articles/ismej200867), who were able to prove the connection between a drop in the pH value in the large intestine and the development of laminitis.
There were two research projects running alongside each other, over the years: one project was about the proof of the harmfulness of lactic acid bacteria in the large intestine, which were always triggered by the feeding of starch or comparable molecules and, the other project was about, the investigations into the microbiome when feeding haylage.
The consequences of feeding haylage
It is only now that the research projects have been brought together to show that it is not only starch that leads to a pathological increase in lactate formers in the large intestine, but also haylage and that the resulting dysbiosis is associated with a significant decrease in cellulolytic microorganisms and an increased risk of hindgut acidosis, laminitis, and leaky gut syndrome.
Feeding lactic acid bacteria in the form of haylage or “Effective Microorganisms” (EM-A, Bokashi, which consist largely of lactic acid bacteria https://www.tandfonline.com/doi/abs/10.1300/J144v03n01_21) or promoting the colonisation of lactic acid bacteria, for example by feeding brewer’s yeast (J. C. Vázquez Chagoyán, ISBN: 978-1-62417-002-7, 2013) is therefore detrimental to intestinal homeostasis and, in addition to inadequate roughage utilisation, also leads to long-term health problems resulting from dysbiosis of the large intestine. The importance to maintain intestinal homeostasis for the horse’s health, is also demonstrated in these two articles: doi: https://www.sciencedirect.com/science/article/abs/pii/S0737080620300344?via%3Dihub and doi: https://core.ac.uk/reader/323989690
A lot of information on the controversial topic of feeding haylage has been collated on our website. Feel free to take a look. Here, is the link to the haylage factsheet: https://wissen.sanoanimal.de/en/2023/03/10/factsheet-roughage-haylage-silage-fermented-hay/.
Sources and studies on this topic
1. www.silageadvice.com; Fact Sheet Series on Haylage for Horses; 27.3.2015
2. Peiretti & Bergero, Grass silages as feedstuff for horses; Journal of Food, Agriculture & Environment Vol.2 (3&4) : 182-185. 2004
3. Müller, Feeding silage and haylage to horses; XVI International Silage Conference; 2012
4. Müller, Wrapped Forages for Horses; Faculty of Veterinary Medicine and Animal Science, Department of Animal Nutrition and Management Uppsala; 2007
5. Jensen et al.; A comparative study of the apparent total tract digestibility of carbohydrates in Icelandic and Danish warmblood horses fed two different haylages and a concentrate consisting of sugar beet pulp and black oats; Arch Anim Nutr. 2010 Oct;64(5):343-56. 2010
6. Moore-Colyer et al., Mathematical modelling of digesta passage rate, mean retention time and in vivo apparent digestibility of two different lengths of hay and big-bale grass silage in ponies; Br J Nutr. 2003 Jul;90(1):109-18. 2003
7. Müller et al.; Effect of forage conservation method on microbial flora and fermentation pattern in forage and in equine colon and faeces; Livestock Science Volume 119, Issues 1–3, December 2008, Pages 116–128; 2008
8. Muhonen et al.; Effects on the equine colon ecosystem of grass silage and haylage diets after an abrupt change from hay; J ANIM SCI 2009, 87:2291-2298.; 2009
9. Hills et al.; Feeding behaviour of horse offered ensiled lucerne; Proceedings of the 13 th International Silage Conference, Auchincruive, Scotland, U.K., pp. 328-329.; 2002
10. Muhonen; Metabolism and hindgut ecosystem in forage fed sedentary and athletic horses.; Diss. Acta Universitatis agriculturae Sueciae, Uppsala1652-6880; 2008
11. Gere et al.; Post mortem survey of peripheral dental caries in 510 Swedish horses; Equine vet. J. (2010) 42 (4) 310-315; 2010
12. Hanche-Olsen et al.; Polyneuropathy Associated with Forage Sources in Norwegian Horses; J Vet Intern Med 2008;22:178–184; 2008
13. O’Brien et al.; Fungal contamination of big-bale grass silage on Irish farms: predominant mould and yeast species and features of bales and silage; Grass and Forage Science Volume 63, Issue 1, pages 121–137; 2008
A further selection of publications relating to the microbiome in the horse gut
If you would like to find out more about the current state of science in relation to the microbiome of the horse’s intestine, you will find a selection of publications here:
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Al Jassim R. A. et al., 2005. The genetic diversity of lactic acid producing bacteria in the equine gastrointestinal tract. FEMS Microbiol. Lett. 248:75–81. doi: 10.1016/j.femsle.2005.05.023
Alexander F., 1963. Production and fermentation of lactate by bacteria in the alimentary canal of the horse and pig. J. Comp. Pathol. 73:1–8. doi: 10.1016/S0368-1742(63)80001-6
Alexander F. et al., 1970. Bacteriophage-like particles in the large intestine of the horse. Res. Vet. Sci. 11:592–593.
Alexander F. et al., 1952. Fermentative activities of some members of the normal coccal flora of the horses large intestine. J. Comp. Pathol. Ther.62:252–259. doi: 10.1016/S0368-1742(52)80026-8
Argenzio R. A., 1975. Functions of the equine large intestine and their interrelationship in disease. Cornell Vet.65:301–331.
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Bełżecki G. et al. 2016. Methods for the cultivation of ciliated protozoa from the large intestine of horses. FEMS Microbiol. Lett.363:fnv233. doi:10.1093/femsle/fnv233
Blackmore T. M. et al. 2013. Strong stability and host specific bacterial community in faeces of ponies. PLoS ONE 8:e75079. doi: 10.1371/journal.pone.0075079
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Costa M. C. et al. 2015a. Characterization and comparison of the bacterial microbiota in different gastrointestinal tract compartments in horses. Vet. J.205:74–80. doi: 10.1016/j.tvjl.2015.03.018
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