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Bloat in Cattle. XVII. Wheat Pasture Bloat and Its Prevention with Poloxalene^{1, 2,}

Kansas State University, Manhattan 66506

Abstract

In four controlled experiments, it was established that bloat occurring in rumen fistulated cattle pastured on wheat is a foamy type. Poloxalene effectively prevented foaming, and bloat scores of controls and those receiving poloxalene differed significantly. Though differences among daily treatments of 1.0, 1.5 or 2.0 g of poloxalene per 100 lb (45.4 kg) body weight were nonsignificant, a dose-response relationship was suggested. A fifth experiment, conducted with 112 heifers pasturing wheat, indicated that a molasses liquid supplement containing poloxalene and a molasses-salt block containing poloxalene significantly reduced bloat incidence and severity during the periods they were offered. The bloat-provocative pastures contained 35.1 to 37.7% crude protein, 9.5 to 12.4% insoluble protein, 17.4 to 18.7% soluble protein, and 6.8 to 7.7% nonprotein nitrogen.

¹ Contribution No. 908, Department of Dairy and Poultry Sciences, Kansas Agricultural Experiment Station, Manhattan.

² Supported in part by a grant from Smith Kline Animal Health Products, Philadelphia, Pa., National Molasses Company, Willow Grove, Pa. and A. E. Staley Manufacturing Company, Decatur, III. The authors gratefully thank the following: Dr. G. Ward and his farm crew for providing the pastures at Manhattan; W. Crowley for use of his cattle in the field study at Leoti; Bruce Perry, Leonard Mullen and Dr. George Davis for help in supervising the field study; Dr. Mike Free (Smith Kline Animal Health Products) for statistical analyses of the data; Drs. J. E. Trei, G. C. Scott and S. F. Scheidy of Smith Kline Animal Health Products, Drs. W. G. Hillis and Leo Curtin, National Molasses Co., and Ken Wright and G. W. Griffel, A. E. Staley Co., for their assistance in numerous ways.

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