Happy Horse Nutrition

Has your horse suddenly become anxious, spooky, reactive or unpredictable... despite being normally calm and sensible?
In this episode, Dr Nerida explores how perennial ryegrass mycotoxins can affect horse behaviour, coordination and performance. Learn about lolitrem B and ergovaline, the toxins associated with ryegrass staggers, tremors, hypersensitivity, exaggerated startle responses, heat intolerance and dramatic behavioural changes.
We also look at when perennial ryegrass pasture and hay pose the greatest risk, how quickly horses may improve once exposure stops, and whether mycotoxin binders can actually help.
If your horse seems to have had a sudden “personality transplant”, their pasture or hay may be worth a closer look and this episode is definitely worth a listen!
Testing pasture or hay for perennial ryegrass toxins
Australia: Southern Scientific Services, Hamilton VIC – pasture toxin testing including lolitrem B and ergovaline. Phone 0408 363 061. Contact the laboratory before collecting/sending samples for current sampling instructions.
USA: Oregon State University Endophyte Service Laboratory – quantitative testing for lolitrem B and ergovaline in pasture, hay and feed. https://emt.oregonstate.edu/endophyte-lab
 
📲 For help balancing your horse's diet, download the MyHappy.Horse App https://apps.apple.com/au/app/myhappy-horse/id6633422324  
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How high can the starch content of clover really get? Can lupins be too high in protein? And does adding lots of different fibre sources actually help your horse’s hindgut microbiome?
In this Q&A episode, Dr Nerida and Orla unpack a mix of practical horse nutrition questions, including clover and insulin dysregulation, faba beans and resistant starch, high-protein diets, gastric ulcers, and why even a skinny horse can still be metabolically at risk.
They also explore one of the biggest emerging areas in equine nutrition: forage diversity and the gut microbiome and how much ingredient variety may be enough to make a meaningful difference to the microbiome.
Plenty of practical feeding advice, a few fun rabbit holes on human and ruminant nutrition, and one genuinely scary clover statistic!
 
📲 To check your horse’s diet and KNOW you are feeding right, download the MyHappy.Horse app ⁠https://apps.apple.com/au/app/myhappy-horse/id6633422324⁠
💛 We’d love if you would leave us a rating, follow the show and share this episode with a friend, it truly helps us get this information in front of more horse owners.
🩺 And if you’d like to get in touch with Orla, Orla.lyons@randlab.com.au

Did you know the microbes living in your horse’s hindgut may be influencing how well they perform?
In this episode, Dr Nerida explores research linking hindgut microbiome diversity, fibre fermentation and performance in horses. We look at studies in Thoroughbreds and trotters showing that higher microbial diversity and greater fibre-fermenting capacity are associated with better racing performance, while greater starch fermentation is linked with poorer performance.
You’ll also learn practical ways to support a healthier, more diverse microbiome through forage, fibre diversity and smarter grain feeding.
Whether you own a racehorse, performance horse or simply want to support better gut health, this episode may leave you in a state of mind-bogglement… which will make perfect sense once you listen. 😂💛
Research mentioned in this episode
Leng et al. (2024)
Early-life gut bacterial community structure predicts disease risk and athletic performance in horses bred for racing
Scientific Reports, 14:17124
https://doi.org/10.1038/s41598-024-64657-6
Park et al. (2024)
Comparison of the fecal microbiota with high- and low performance race horses
Journal of Animal Science and Technology, 66(2):425–437
https://doi.org/10.5187/jast.2023.e45
Vasseur et al. (2024)
Fibrolytic efficiency of the large intestine microbiota may benefit running speed in French trotters: A pilot study
Physiological Reports, 12(21)
https://doi.org/10.14814/phy2.70110
Hansen et al. (2015)
High nutrient availability reduces the diversity and stability of the equine caecal microbiota
Microbial Ecology in Health and Disease, 26:27216
https://doi.org/10.3402/mehd.v26.27216
Grimm et al. (2020)
Dietary composition and yeast/microalgae combination supplementation modulate the microbial ecosystem in the caecum, colon and faeces of horses
British Journal of Nutrition, 123(4):372–382
https://doi.org/10.1017/S0007114519002824

Managing a laminitis-prone horse through spring can feel like a full-time job! Especially when pasture non-structural carbohydrate (NSC) levels can change dramatically with the weather.
In this episode, Dr Nerida and Orla talk through the practical realities of managing horses with laminitis and insulin dysregulation, including why frosty nights and sunny days can make spring pasture particularly risky, when grass is likely to be safest to graze, and how grazing muzzles, strip grazing and low-NSC hay can help.
They also discuss clover, forage testing, nitrate risk, exercise and insulin sensitivity, and the challenge of keeping horses eating enough fibre while still controlling calorie and sugar intake.
A useful follow-up to our conversation with Dr Luke Wells-Smith, for anyone navigating laminitis and spring pasture with a metabolic horse or pony.

🤖 If you have questions about laminitis, or any other feeding and nutrition related question, give Dr Nerida AI a go: https://www.myhappy.horse/nerida-ai
 
💛 And to really look in detail at your horse’s diet, download the MyHappy.Horse nutrition app: https://apps.apple.com/au/app/myhappy-horse/id6633422324

In this episode, Dr Nerida is joined by Dr Luke Wells-Smith, dual qualified  equine veterinarian and farrier, for a unique perspective on laminitis.
Dr Luke unpacks what’s happening inside the hoof during laminitis, the early warning signs horse owners can watch for, insulin dysregulation, digital pulses and hoof growth rings. 
Nerida and Luke also get into nutrition, misleading “grain-free” feed labels, beet pulp, the microbiome, and why identifying and controlling the underlying cause of laminitis is so critical.
A fun and practical conversation for anyone wanting to better understand laminitis and protect their horse’s hooves.
You can find Dr Luke Wells-Smith at the Motion Equine Centre:
https://www.motion-equine.com.au/
Telehealth consultations with Dr Luke Wells-Smith:
https://motion-equine.com.au/telehealth