Effects Of Trimming On Dairy Cattle Hoof Weight Bearing Surfaces And Pressure Distributions [efeito Do Casqueamento Na Distribuição De Pressões E Suporte De Peso Na Superfície Dos Cascos De Vacas Leiteiras]

Abstract

Claw lameness can be associated to biomechanical factors caused by unbalanced pressure distribution under the hooves when cows are confined in modern dairy operations with hard concrete flooring. In the present study, an original claw subdivision 4 was slightly modified to differentiate between the anterior (typical sole lesion spot) and posterior portions of the medial sole, and to emphasize the maximum pressures applied only on the area of contact without including the total area within these regions during midstance. The results, obtained showed significance (p < 0.044) for the interaction among Group, Leg and region (G*L*R). It was observed that the rear portion of the claws (heels) on the hind limb of untrimmed cows, are more stressed than the heel region on trimmed cows (23 % versus 16.72% of total pressure applied on the claw for untrimmed and trimmed respectively). The typical sole lesion spot pressures were increased slightly on trimmed cows as compared to untrimmed (20.20% versus 15.9%). The front feet presented differences in pressure concentration on the lateral sole between both groups (29% versus 23.25% for untrimmed versus trimmed respectively). It was concluded that, although the differences were small (5%) changes in pressure concentration, untrimmed cows stress more the sole lateral as compared to trimmed on the front feet, and on the rear feet, they stress more the heel region whereas trimmed cows tend to have a slight better balance among regions. Conversely, when cows are trimmed, the typical sole lesion spot concentrates more pressure than the heel itself (20.20% versus 16.72% respectively) and may favor the occurrence of sole ulcers.434518525Raven, E.T., (1989) Cattle foot care and claw trimming, pp. 19-33. , Ipswich, UK: Farming PressShearer, J.K., Van Amstel, S.R., (2000) Manual for the master hoof care technician program, pp. 6-14. , University of Florida-Gainesville, FL: Department of Large Animal Clinical Sciences-College of Veterinary MedicineShearer, J.K., (2003) Large animal clinical sciences, , Veterinary Medicine School, University of Florida. Gainesville, FL, personal communicationCarvalho, V.R.C., (2004) Effects of trimming on dairy cattle hoof weight bearing surfaces and pressure distributions during the stance phase, , Tese (Doutorado)-University of Florida, Gainesville, FL, 2004Manske, T., Hultgren, J., Bergsten, C., The effect of claw trimming on the hoof health of swedish dairy cattle (2002) Preventive Veterinary Medicine, 54, pp. 113-12