Summary and Implications
The objective of this study was to compare differences in weight placed on each hoof from sows in differing lameness phases. Twelve, clinically healthy, mixed-parity, crossbred sows (228.89±19.17 kg) were used. The sow was the experimental unit and a cross-over design with a 2 (hind left and hind right hoof) x 3 (days: D-1, D+1 and D+6) factorial arrangement of treatments were compared. On induction day, 10 mg of amphotericin B were injected in the distal interphalangeal joint space in both claws of one hind hoof. All sows served as their own control and treatment. After completion of the first round, sows were given a 7-day rest period and then the round procedures were repeated with the opposite hind hoof induced. Sows stood individually on an embedded force plate for 15 minutes, and weight on each hoof was measured independently. All data were statistically analyzed using the PROC MIXED procedure in SAS. On the D+1, sows exhibited less weight bearing on the induced lame hoof compared to D-1 (P < 0.0001). Regardless of which hoof was injected, sow weight distribution did not vary between the injected left or right hind hooves (P = 0.99) or between rounds (P = 0.64). Findings from our study indicate that the embedded force plate exhibited differences between sound and most lame phases indicating the potential as an objective tool for detecting differences in weight distribution when sows are sound and lame.
Iowa State University
Mohling, Caroline M.; Johnson, Anna K.; Stalder, Kenneth J.; Abell, Caitlyn; Karriker, Locke A.; Coetzee, Johann F.; and Millman, Suzanne T.
"Embedded Micro-Computer Base Force Plate as an Objective Tool to Measure Hoof Lameness Phases in Multiparous Sows,"
Animal Industry Report:
AS 660, ASL R2909.
Available at: http://lib.dr.iastate.edu/ans_air/vol660/iss1/74