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Randomized clinical trial investigating the impact of exercise and standing on concrete for five weeks prior to first calving on time to first lameness event in dairy heifers
Winston Mason and Richard Laven
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Objectives
Recent international research has demonstrated that one of the more important risk factors for lameness is a previous case of lameness. This suggests that an increased amount of effort should be aimed at extending the time to first lameness case, with particular emphasis around the transition period for the heifer. The transition period for heifers is relatively unique in New Zealand, in that a large proportion (>80%) of dairy heifers calve over a short time frame of approximately 2 months, and these heifers have usually spent the majority, if not all, of their life prior to first-calving event on pasture. Yet after calving, these animals are exposed to a host of new environmental and management stressors, and to the now well-accepted consequences that calving has on the hoof.
The primary objective of this study was to assess whether a conditioning and exercise regime 5 weeks pre-calving increases the time to first lameness event in dairy heifers in pasture-based systems. Practically, this objective investigated whether we can alter pre-calving transition management in first-calving heifers to make them more able to withstand the physiological and management changes that occur post calving with respect to hoof health. [...]
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