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1 University of Bristol, Department of Clinical Veterinary Science, Division of Animal Health and Husbandry, nnnLangford House, Langford, Bristol, BS40 5DU, UK
2 Wood Veterinary Group, Gloucester Laboratories, St Oswalds Road, Gloucester, UK GL1 2SJ
3 Roche Vitamins (UK) Ltd, Heanor, Derbyshire, UK DE75 7SG
4 University of Warwick, Ecology and Epidemiology Group, Department of Biological Sciences, Coventry, UK CV4 7AL and Department of Community Health and Epidemiology, Queen's University, Kingston, Ontario, CANADA, K7L 3N6
5 University of Warwick, Ecology and Epidemiology Group, Department of Biological Sciences, Coventry, UK CV4 7AL
A longitudinal prospective intervention study investigated the effect of biotin supplementation on the incidence (new cases per day) of visible lameness in milking cows and heifers on five commercial farms in Gloucestershire, United Kingdom. The trial lasted from June 1997 to April 1999. Each farm participated in the trial for 18 mo. Within each herd the cows were randomly allocated to either receive a supplement of 20 mg of biotin per day or not. All cows were run as one herd on each farm. When a lame cow was identified, the farmer called one of six veterinarians to examine and treat the affected animal; findings were recorded on a standard form. A veterinarian also carried out a bimonthly locomotion assessment to ensure that all lame cows were diagnosed. There were a total of 900 cows, 1120 cow years, in the trial. The overall incidence rate of lameness (per 100 cows per year) was 68.9, with a range of 31.6 to 111.5 per farm. The incidence rates of the four most frequently reported causes of lameness were sole ulcer, 13.8; white line separation, 12.7; digital dermatitis, 12.0; and interdigital necrobacillosis, 7.1 per 100 cows per year. There was a significant difference in the incidence rate of these four lesions between supplemented and unsupplemented cows on two of the five farms, with a significant decrease in lameness in the cows supplemented with biotin. When all the farms were pooled, the risk of lameness caused by white line separation in cattle supplemented with biotin was approximately halved (Cox proportional hazard survival analysis hazard ratio = 0.57).
Key Words: dairy cow lameness • biotin • survival analysis • white line separation
Submitted on December 7, 2000
Accepted on April 3, 2001
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