Evaluation of a liquid formulation of monensin to control bloat in pasture-fed milking cows

Evaluation of a liquid formulation of monensin to control bloat in pasture-fed milking cows
Peer reviewed

Abstract

AIM:  To evaluate the effectiveness of a liquid formulation of monensin in reducing bloat score in milking cows grazing pasture.
METHODS:  A Friesian x Jersey crossbred herd which had been genetically selected for high bloat susceptibility since 1973 was used in this study. Two trials were conducted, each involving two groups of 15 cows, randomly allocated to Treated or Control groups. Trial 1 involved twice-daily administration of a novel liquid formulation of monensin given to Treated cows at morning and afternoon milkings. Trial 2 involved once-daily administration of the same product to Treated cows at the morning milking only. Control cows received no preventative treatment. The total daily dose of monensin in each trial was 300 mg per cow, given in a total volume of 100 ml of liquid. Animals were scored for bloat twice-daily whilst grazing on white-clover/ryegrass or red-clover pastures. The scoring system used a scale of 0, 1, 1.5, 2, 2.5, or 3, representing scores of increasing bloat severity as assessed by palpation of abdominal pressure on the left and right sides of the cow.
RESULTS:  In Trial 1, severe bloat was recorded at 9 out of 23 scoring sessions. Twelve Control cows required therapeutic treatment for bloat on at least one day, compared to 3 cows in the Treated group (p=0.003). In Trial 2, severe bloat in 3 of 9 scoring sessions led to 8/15 Control animals requiring therapeutic treatment compared to 1/14 cows in the Treated group (p=0.02).
CONCLUSIONS: Oral drenching with the liquid formulation of monensin tested was effective in reducing bloat score in milking cows grazed on pasture.
KEY WORDS: Dairy, cows, bloat, Rumensin Liquid, monensin, drench.

Access to the full text of this article is available:

through another providers website:

If you're a member or subscriber and believe you should have access:

Login

Otherwise:

Register for an account

Request new password

The whole of the literary matter of the New Zealand Veterinary Journal is copyright Taylor and Francis, Downloading this article signifies agreement with the terms and conditions of electronic access.