Calves treated with IVOMEC 1% Injection showed significant production improvements.

Three trials were undertaken in three different regions of New Zealand. In all, 345 heifers and steers were included. The heavy parasite challenge in these regions demands repeated antiparasitic treatments and shorter treatment intervals. Regardless of product used, failure to provide effective control inevitably leads to parasite challenge increasing to unacceptable levels.
At each location, cattle were individually weighed, matched by weight, and randomly allocated among three treatment groups:

• Group 1 received IVOMEC once at the start of the study, and additional treatments as needed (Control)
• Group 2 received IVOMEC four times at intervals of 6 weeks
• Group 3 received IVOMEC six times at intervals of 6 weeks

Cattle shared pasture for the duration of the trial on each of the three farms (259, 265, or 266 days).
In each trial, cattle in Group 1 required treatment at different intervals, verifying that there was sufficient parasite challenge present to cause disease and production losses. Ove rall, in each study, cattle treated six times with IVOMEC 1% Injection showed a significant improvement (P<0.01) in weight gain compared to the cattle treated four times, which, in turn, showed a significant improvement over Group 1 (P< 0.01).

McPherson et al, 1989, Proc.N.Z.Soc.Anim.Prod., 49:307-311

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