Effects of housing and two forage diets on the development of claw horn lesions in dairy cows at first calving and in first lactation.
Authors: Webster A J
Journal: Veterinary journal (London, England : 1997)
Summary
# Editorial Summary Webster's 2001 investigation examined how housing type and forage dry matter content influence claw horn lesion (CHL) development in first-calving dairy heifers, tracking sole and white line pathology across five inspection points from four weeks pre-calving through six months of lactation. Using geometric and cumulative lesion scoring methodology, the research documented a marked increase in haemorrhagic lesions during the critical first eight weeks post-calving—a period of profound metabolic and mechanical stress—with cubicle-housed animals showing significantly greater severity and persistence than their straw yard counterparts, whilst wet feeding exacerbated lesion development only in cubicle systems. Notably, heel morphology differed markedly between housing types: straw yard cattle developed thicker heels prone to pitting erosion, whilst cubicle cattle presented smooth but thin heels that may amplify concussive loading within the horn capsule. Although a significant correlation existed between sole lesion scores and lameness, neither body weight, condition score nor foot conformation predicted lesion severity, suggesting that the periparturient period creates a systemic vulnerability to CHL that housing and management conditions either mitigate or exacerbate. These findings have substantial implications for farriers and veterinarians: they underscore the critical importance of optimising the transition environment for first-calving heifers and suggest that straw yard housing offers mechanical and environmental advantages for claw health during this vulnerable lactational window.
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Practical Takeaways
- •Housing system significantly impacts claw horn lesion development in early lactation; straw yards reduce lesion severity compared to cubicles, potentially through different heel characteristics and reduced concussive forces
- •Forage type effects are housing-dependent; wet feeding is problematic only in cubicle systems, suggesting management strategies should be tailored to specific housing configurations
- •Systemic changes from calving and lactation onset initiate lesion development, but external factors (housing and feeding) determine final severity—focus management interventions around the periparturient period
Key Findings
- •Claw horn lesion severity and persistence were significantly greater in cattle housed in cubicle yards compared to straw yards
- •Geometric and cumulative lesion scores increased in all groups during the first eight weeks post-calving
- •Wet feeding increased claw horn lesion severity only in cubicle-housed cattle, with no effect in straw yards
- •Highly significant correlation existed between sole lesion scores and lameness in individual animals (correlation coefficient not specified but noted as 'relatively low')