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Bloat in cattle

1959; Taylor & Francis; Volume: 2; Issue: 5 Linguagem: Inglês

10.1080/00288233.1959.10423267

1175-8775

A. T. Phillipson, J. L. Mangan,

Gout, Hyperuricemia, Uric Acid

Summary The saliva from the parotid and submaxillary glands and the residual saliva that flowed from the mouth, have been collected from 5- to 8-months-old calves and analysed for electrolytes and nitrogenous compounds. Carbachol and inflation of the rumen have been used to induce salivation. Parotid and residual saliva contained Na+ and HCO3- at concentrations of about 100 me./litre, potassium and phosphate at approximately 15-20 me./litre, while calcium was in the range 3-7 me./litre. The nitrogen of parotid saliva was mainly in the form of urea. Residual saliva contained in addition appreciable concentrations of mucoprotein. The compositions of both secretions were independent of the type of stimulation used. The mucoprotein content of submaxillary saliva was greater than that of either parotid or residual saliva, but the urea concentration did not differ significantly. Submaxillary saliva induced by carbachol stimulation contained less Na+ and HCO3- and more Ca2+ than the parotid and residual saliva. The content of potassium was approximately the same but HPO4 2- was present only in traces. Inflation of the rumen produced approximately a fivefold increase in the mucoprotein concentration of submaxillary saliva without significantly altering the concentration of other components. The possible relationship between the composition of saliva and production of bloat are discussed.