Efficacy of a novel copper-based footbath preparation for the treatment of ovine footrot during the spread period.

OBJECTIVE

To determine the efficacy of a novel copper based footbath preparation (CHF-1020) for treatment of ovine footrot during the spread period.

DESIGN

A series of field trials with treated and control groups run together.

ANIMALS

Mobs of at least 125 sheep on each of six properties in southern New South Wales with equal numbers of controls.

PROCEDURE

Sheep of group A were treated after minimal paring by making them stand in CHF-1020 for 15 minutes. Treatment was undertaken at intervals throughout the period of the trials (14 September to 17 December 1993). Group A sheep were run on the same pasture as those from group B (untreated sheep).

RESULTS

The percentage of sheep exhibiting clinical signs of ovine footrot at the start of the trial ranged from 35 to 88% at score 3 or higher, using a 0 to 5 footscoring system. During the trial, the percentage of infected sheep (greater or equal to score 2) in group B increased and ranged from 40 to 90%. The level of infected sheep in group A on each property was reduced progressively to 1 to 16%. Cure rates of 45 to 94% were achieved, with the lowest rate being on a property with a metal footbath. The next lowest cure rate was 73%. Results indicated that treatment should be undertaken at 2-weekly intervals while spread continues. Treated sheep can be returned to contaminated pastures.

CONCLUSION

CHF-1020 is effective during the spread period and can be used for the progressive eradication of ovine footrot.