The traditional method for detecting equine lameness is subjective, using expert visual evaluation of gait to identify the presence or absence and degree of asymmetries. The lame horse is described as having a disorder, defect or loss of function and this clinical diagnosis has associated welfare implications if the horse is still asked to perform.
The article explains how advanced computer technology is starting to change all this. Optic motion capture or the use of inertial measurement units (IMUs) is now enabling the detailed study and quantification of the horse’s gait; objective assessment against preset thresholds. The paper points out that while these digital systems can overcome the temporal and spatial limitations of the human eye they simply rely on one or a number of set gait parameters to decide about lameness and this can present obstacles.
Thresholds are forcibly based on a limited reference population, which doesn’t adequately reflect the millions of horses in the world. The individual environmental and mental conditions for each horse and its day-to-day gait variations are also not accounted for. On this basis to use the term ‘lame’ because a horse demonstrates a subtle gait alteration, causing it to fall below the threshold, could be inappropriate, particularly as it may not affect the horse’s welfare in any way.
Professor Celia Marr, Editor of the Equine Veterinary Journal said: "An important first step is for researchers and clinicians to start to discriminate clearly between 'asymmetry' and 'lameness' and not to use these as interchangeable terms when interpreting gait analysis data. Asymmetry is often, but not always, a hallmark of lameness, but is not a clinical term, whereas lameness is."
Dr Johanna Fink-Gremmels – Professor of Veterinary Pharmacology and Toxicology at Utrecht University – has warned that UK cattle producers need to plan for an on-going struggle with feed-borne mycotoxins, and says vets need to help farmers understand and mitigate the negative impact on animal health.
Speaking to cattle vets at a CPD meeting organised by Alltech, she said: "When you see a general inflammatory response, such as elevated somatic cell count, mycotoxicosis should always be on your radar. The mycotoxin threat to cattle is increasing in the UK, yet it is often the most neglected causative issue on any list of pathogenic suspects."
Johanna explained that natural toxins produced by diverse fungal species are proliferating worldwide, partly as a result of global climate change, but also because of changing agronomic practices in developed countries.
"Total mixed rations often now contain more than one fungal species, contributing to a complex mycotoxin picture and unresolved health issues in a herd as a result. Cow signals such as reduced feed intake, reproductive disorders, laminitis, mastitis, impaired liver function, a poor response to vaccination programmes and even increased susceptibility to bacterial and viral diseases can all be attributed to ingesting mycotoxin contaminated feed."
Johanna says the biggest challenge for UK dairy farmers is now multiple mycotoxin contamination of grass and maize silage.
"Cattle health problems with feeding obviously mouldy silage are relatively well understood. But new harder to detect fusarium toxins – such as, for example, Enniatins and Beauvericin contaminating cereal grains – are also now being found in pasture grass in Northern Europe. These will also adversely affect the efficiency and function of the rumen.
"The rumen determines the health and productivity of the cow. When rumen bacteria are suffering the liver does not function correctly initiating a cascade of adverse events; and often a generalised inflammatory response is triggered, which leads to a loss of production."
Johanna added that in the future farmers will need select feed crop plants that are more resistant to fungal invasion and will also have to re-adjust tillage methods to reduce mould contamination. "However, we know that this alone will not stamp out mycotoxin contamination without creating a biological vacuum that will be filled with other micro-organisms.
"Consequently, it will be essential to continue to apply strategies such as rigorous on-farm risk assessment and the use of appropriate in-feed mycotoxin-sequestration agents (binders) to prevent the production-limiting and adverse health effects in our farmed livestock."